summaryrefslogblamecommitdiffstats
path: root/mISDN.cpp
blob: dfb8a6d109ce9f6b9e23b68f6c3bf8c848f8eded (plain) (tree)
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132





























































                                                                                                                                                           
                       




                                                           
                         
                                   
                                                        













































































                                                                                                                                     
                                  













                                                                                 
                                       









































                                                                                                                                            




                                                                                                                                     



































                                                                                                                                         
     




                                                                                                                                  
      









                                                                                                                                                            
                                                                      













                                                                   




                                                                                                                                                   
































                                                                                                                                                     
     




                                                                                                                                                
      
































































































































                                                                                                                                               


















































                                                                                                                                                





                                





































































                                                                                                                                                        

























































































                                                                                                                                 

                                                             
           

                                       




























                                                                                                       


                                          
                                                                                               


















                                                                                                                                              




















































































































































































                                                                                                                  









                                                                                            










                                                                                                                       
      














































































                                                                                                                                   
     





                                                                                                                         
      

































                                                                                                                        







                                                      


















                                                                          
                                               





                                                                                            
                                                                                                                                                







                                                                                                                             
                                                          









                                                                                                                                  
                                                          

                                         
































                                                                                                                                                                
                                          














































































































































































































































































































                                                                                                                                                                                                                                                                                   
                                                              














































































































































































                                                                                                                                                                                                             




                                                                                       
























































































































































































































































































































































































































































































































                                                                                                                                                                                                                 
/*****************************************************************************\
**                                                                           **
** PBX4Linux                                                                 **
**                                                                           **
**---------------------------------------------------------------------------**
** Copyright: Andreas Eversberg                                              **
**                                                                           **
** mISDN port abstraction for dss1 and sip                                   **
**                                                                           **
\*****************************************************************************/ 


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "main.h"
#include <unistd.h>
#include <poll.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
extern "C" {
#include <net_l2.h>
}

#define ISDN_PID_L2_B_USER 0x420000ff
#define ISDN_PID_L3_B_USER 0x430000ff
#define ISDN_PID_L4_B_USER 0x440000ff

/* used for udevice */
int entity = 0;

/* noise randomizer */
unsigned char mISDN_rand[256];
int mISDN_rand_count = 0;

/* the device handler and port list */
int mISDNdevice = -1;

/* list of mISDN ports */
struct mISDNport *mISDNport_first;

/*
 * constructor
 */
PmISDN::PmISDN(int type, mISDNport *mISDNport, char *portname, struct port_settings *settings, int channel, int exclusive) : Port(type, portname, settings)
{
	p_m_mISDNport = mISDNport;
	p_m_portnum = mISDNport->portnum;
	p_m_b_index = -1;
	p_m_b_channel = 0;
	p_m_b_exclusive = 0;
	p_m_b_reserve = 0;
	p_m_b_addr = 0;
	p_m_b_stid = 0;
	p_m_jittercheck = 0;
	p_m_delete = 0;
	p_m_hold = 0;
	p_m_txvol = p_m_rxvol = 0;
	p_m_conf = 0;
	p_m_txdata = 0;
#warning set delay by routing parameter or interface config
	p_m_delay = 0;
	p_m_echo = 0;
	p_m_tone = 0;
	p_m_rxoff = 0;
	p_m_calldata = 0;
	p_m_dtmf = !options.nodtmf;
	sollen wir daraus eine interface-option machen?:
	p_m_timeout = 0;
	p_m_timer = 0;
#warning denke auch an die andere seite. also das setup sollte dies weitertragen

	p_m_crypt = 0;
	p_m_crypt_listen = 0;
	p_m_crypt_msg_loops = 0;
	p_m_crypt_msg_loops = 0;
	p_m_crypt_msg_len = 0;
	p_m_crypt_msg[0] = '\0';
	p_m_crypt_msg_current = 0;
	p_m_crypt_key[0] = '\0';
	p_m_crypt_key_len = 0;
	p_m_crypt_listen = 0;
	p_m_crypt_listen_state = 0;
	p_m_crypt_listen_len = 0;
	p_m_crypt_listen_msg[0] = '\0';
	p_m_crypt_listen_crc = 0;

	/* if any channel requested by constructor */
	if (channel == CHANNEL_ANY)
	{
		/* reserve channel */
		p_m_b_reserve = 1;
		mISDNport->b_reserved++;
	}

	} else
	/* reserve channel */
	if (channel) // only if constructor was called with a channel resevation
		seize_bchannel(channel, exclusive);

	/* we increase the number of objects: */
	mISDNport->use++;
	PDEBUG(DEBUG_ISDN, "Created new mISDNPort(%s). Currently %d objects use, port #%d\n", portname, mISDNport->use, p_m_portnum);
}


/*
 * destructor
 */
PmISDN::~PmISDN()
{
	struct message *message;

	/* remove bchannel relation */
	free_bchannel();

	/* release epoint */
	while (p_epointlist)
	{
		PDEBUG(DEBUG_ISDN, "destroy mISDNPort(%s). endpoint still exists, releaseing.\n", p_name);
		message = message_create(p_serial, p_epointlist->epoint_id, PORT_TO_EPOINT, MESSAGE_RELEASE);
		message->param.disconnectinfo.cause = 16;
		message->param.disconnectinfo.location = LOCATION_PRIVATE_LOCAL;
		message_put(message);
		/* remove from list */
		free_epointlist(p_epointlist);
	}

	/* we decrease the number of objects: */
	p_m_mISDNport->use--;
	PDEBUG(DEBUG_ISDN, "destroyed mISDNPort(%s). Currently %d objects\n", p_name, p_m_mISDNport->use);
}


/*
 * send control information to the channel (dsp-module)
 */
void ph_control(unsigned long b_addr, int c1, int c2)
{
	unsigned char buffer[mISDN_HEADER_LEN+sizeof(int)+sizeof(int)];
	iframe_t *ctrl = (iframe_t *)buffer; 
	unsigned long *d = (unsigned long *)&ctrl->data.p;

	ctrl->prim = PH_CONTROL | REQUEST;
	ctrl->addr = b_addr | FLG_MSG_DOWN;
	ctrl->dinfo = 0;
	ctrl->len = sizeof(int)*2;
	*d++ = c1;
	*d++ = c2;
	mISDN_write(mISDNdevice, ctrl, mISDN_HEADER_LEN+ctrl->len, TIMEOUT_1SEC);
}

void ph_control_block(unsigned long b_addr, int c1, void *c2, int c2_len)
{
	unsigned char buffer[mISDN_HEADER_LEN+sizeof(int)+c2_len];
	iframe_t *ctrl = (iframe_t *)buffer;
	unsigned long *d = (unsigned long *)&ctrl->data.p;

	ctrl->prim = PH_CONTROL | REQUEST;
	ctrl->addr = b_addr | FLG_MSG_DOWN;
	ctrl->dinfo = 0;
	ctrl->len = sizeof(int)+c2_len;
	*d++ = c1;
	memcpy(d, c2, c2_len);
	mISDN_write(mISDNdevice, ctrl, mISDN_HEADER_LEN+ctrl->len, TIMEOUT_1SEC);
}


/*
 * activate / deactivate bchannel
 */
static void bchannel_activate(struct mISDNport *mISDNport, int i)
{
	iframe_t act;

	/* we must activate if we are deactivated */
	if (mISDNport->b_state[i] == B_STATE_IDLE)
	{
		/* activate bchannel */
		PDEBUG(DEBUG_BCHANNEL, "activating bchannel (index %d), because currently idle (address 0x%x).\n", i, mISDNport->b_addr[i]);
		act.prim = DL_ESTABLISH | REQUEST; 
		act.addr = mISDNport->b_addr[i] | FLG_MSG_DOWN;
		act.dinfo = 0;
		act.len = 0;
		mISDN_write(mISDNdevice, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
		mISDNport->b_state[i] = B_STATE_ACTIVATING;
		return;
	}

	/* if we are active, we configure our channel */
	if (mISDNport->b_state[i] == B_STATE_ACTIVE)
	{
		unsigned char buffer[mISDN_HEADER_LEN+ISDN_PRELOAD];
		iframe_t *pre = (iframe_t *)buffer; /* preload data */
		unsigned char *p = (unsigned char *)&pre->data.p;

		/* it is an error if this channel is not associated with a port object */
		if (!mISDNport->b_port[i])
		{
			PERROR("bchannel index i=%d not associated with a port object\n", i);
			return;
		}

		/* configure dsp features */
		if (mISDNport->b_port[i]->p_m_txdata)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set txdata to txdata=%d.\n", mISDNport->b_port[i]->p_m_txdata);
			ph_control(mISDNport->b_addr[i], (mISDNport->b_port[i]->p_m_txdata)?CMX_TXDATA_ON:CMX_TXDATA_OFF);
		}
		if (mISDNport->b_port[i]->p_m_delay)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set delay to delay=%d.\n", mISDNport->b_port[i]->p_m_delay);
			ph_control(mISDNport->b_addr[i], CMX_DELAY, mISDNport->b_port[i]->p_m_delay);
		}
		if (mISDNport->b_port[i]->p_m_txvol)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we change tx-volume to shift=%d.\n", mISDNport->b_port[i]->p_m_txvol);
			ph_control(mISDNport->b_addr[i], VOL_CHANGE_TX, mISDNport->b_port[i]->p_m_txvol);
		}
		if (mISDNport->b_port[i]->p_m_rxvol)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we change rx-volume to shift=%d.\n", mISDNport->b_port[i]->p_m_rxvol);
			ph_control(mISDNport->b_addr[i], VOL_CHANGE_RX, mISDNport->b_port[i]->p_m_rxvol);
		}
//tone		if (mISDNport->b_port[i]->p_m_conf && !mISDNport->b_port[i]->p_m_tone)
		if (mISDNport->b_port[i]->p_m_conf)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we change conference to conf=%d.\n", mISDNport->b_port[i]->p_m_conf);
			ph_control(mISDNport->b_addr[i], CMX_CONF_JOIN, mISDNport->b_port[i]->p_m_conf);
		}
		if (mISDNport->b_port[i]->p_m_echo)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set echo to echo=%d.\n", mISDNport->b_port[i]->p_m_echo);
			ph_control(mISDNport->b_addr[i], CMX_ECHO_ON, 0);
		}
		if (mISDNport->b_port[i]->p_m_tone)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set tone to tone=%d.\n", mISDNport->b_port[i]->p_m_tone);
			ph_control(mISDNport->b_addr[i], TONE_PATT_ON, mISDNport->b_port[i]->p_m_tone);
		}
		if (mISDNport->b_port[i]->p_m_rxoff)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set rxoff to rxoff=%d.\n", mISDNport->b_port[i]->p_m_rxoff);
			ph_control(mISDNport->b_addr[i], CMX_RECEIVE_OFF, 0);
		}
#if 0
		if (mISDNport->b_port[i]->p_m_txmix)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set txmix to txmix=%d.\n", mISDNport->b_port[i]->p_m_txmix);
			ph_control(mISDNport->b_addr[i], CMX_MIX_ON, 0);
		}
#endif
		if (mISDNport->b_port[i]->p_m_dtmf)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set dtmf to dtmf=%d.\n", mISDNport->b_port[i]->p_m_dtmf);
			ph_control(mISDNport->b_addr[i], DTMF_TONE_START, 0);
		}
		if (mISDNport->b_port[i]->p_m_crypt)
		{
			PDEBUG(DEBUG_BCHANNEL, "during activation, we set crypt to crypt=%d.\n", mISDNport->b_port[i]->p_m_crypt);
			ph_control_block(mISDNport->b_addr[i], BF_ENABLE_KEY, mISDNport->b_port[i]->p_m_crypt_key, mISDNport->b_port[i]->p_m_crypt_key_len);
		}
		todo: wer startet/stoppt eigentlich den audio-transmit
	}
}

static void bchannel_deactivate(struct mISDNport *mISDNport, int i)
{
	iframe_t dact;

	if (mISDNport->b_state[i] == B_STATE_ACTIVE)
	{
		/* reset dsp features */
		if (mISDNport->b_port[i])
		{
			if (mISDNport->b_port[i]->p_m_delay)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset txdata from txdata=%d.\n", mISDNport->b_port[i]->p_m_txdata);
				ph_control(mISDNport->b_addr[i], CMX_TXDATA_OFF, 0);
			}
			if (mISDNport->b_port[i]->p_m_delay)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset delay from delay=%d.\n", mISDNport->b_port[i]->p_m_delay);
				ph_control(mISDNport->b_addr[i], CMX_JITTER, 0);
			}
			if (mISDNport->b_port[i]->p_m_txvol)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset tx-volume from shift=%d.\n", mISDNport->b_port[i]->p_m_txvol);
				ph_control(mISDNport->b_addr[i], VOL_CHANGE_TX, 0);
			}
			if (mISDNport->b_port[i]->p_m_rxvol)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset rx-volume from shift=%d.\n", mISDNport->b_port[i]->p_m_rxvol);
				ph_control(mISDNport->b_addr[i], VOL_CHANGE_RX, 0);
			}
			if (mISDNport->b_port[i]->p_m_conf)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we release conference from conf=%d.\n", mISDNport->b_port[i]->p_m_conf);
				ph_control(mISDNport->b_addr[i], CMX_CONF_SPLIT, 0);
			}
			if (mISDNport->b_port[i]->p_m_echo)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset echo from echo=%d.\n", mISDNport->b_port[i]->p_m_echo);
				ph_control(mISDNport->b_addr[i], CMX_ECHO_OFF, 0);
			}
			if (mISDNport->b_port[i]->p_m_tone)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset tone from tone=%d.\n", mISDNport->b_port[i]->p_m_tone);
				ph_control(mISDNport->b_addr[i], TONE_PATT_OFF, 0);
			}
			if (mISDNport->b_port[i]->p_m_rxoff)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset rxoff from rxoff=%d.\n", mISDNport->b_port[i]->p_m_rxoff);
				ph_control(mISDNport->b_addr[i], CMX_RECEIVE_ON, 0);
			}
#if 0
			if (mISDNport->b_port[i]->p_m_txmix)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset txmix from txmix=%d.\n", mISDNport->b_port[i]->p_m_txmix);
				ph_control(mISDNport->b_addr[i], CMX_MIX_OFF, 0);
			}
#endif
			if (mISDNport->b_port[i]->p_m_dtmf)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset dtmf from dtmf=%d.\n", mISDNport->b_port[i]->p_m_dtmf);
				ph_control(mISDNport->b_addr[i], DTMF_TONE_STOP, 0);
			}
			if (mISDNport->b_port[i]->p_m_crypt)
			{
				PDEBUG(DEBUG_BCHANNEL, "during deactivation, we reset crypt from crypt=%d.\n", mISDNport->b_port[i]->p_m_dtmf);
				ph_control(mISDNport->b_addr[i], BF_DISABLE, 0);
			}
		}
		/* deactivate bchannel */
		PDEBUG(DEBUG_BCHANNEL, "deactivating bchannel (index %d), because currently active.\n", i);
		dact.prim = DL_RELEASE | REQUEST; 
		dact.addr = mISDNport->b_addr[i] | FLG_MSG_DOWN;
		dact.dinfo = 0;
		dact.len = 0;
		mISDN_write(mISDNdevice, &dact, mISDN_HEADER_LEN+dact.len, TIMEOUT_1SEC);
		mISDNport->b_state[i] = B_STATE_DEACTIVATING;
		return;
	}
}


/*
 * check for available channel and reserve+set it.
 * give channel number or SEL_CHANNEL_ANY or SEL_CHANNEL_NO
 * give exclusiv flag
 * returns -(cause value) or x = channel x or 0 = no channel
 */
denke ans aktivieren und deaktivieren
int PmISDN::seize_bchannel(int channel, int exclusive)
{
	int i;

	/* the channel is what we have */
	if (p_m_b_channel == channel)
		return(channel);

	/* if channel already in use, release it */
	if (p_m_b_channel)
		drop_bchannel();

	/* if CHANNEL_NO */
	if (channel==CHANNEL_NO || channel==0)
		return(0);
	
	/* is channel in range ? */
	if (channel==16
	 || (channel>p_m_mISDNport->b_num && channel<16)
	 || ((channel-1)>p_m_mISDNport->b_num && channel>16)) /* channel-1 because channel 16 is not counted */
		return(-6); /* channel unacceptable */

	/* request exclusive channel */
	if (exclusive && channel>0)
	{
		i = channel-1-(channel>16);
		if (p_m_mISDNport->b_port[i])
			return(-44); /* requested channel not available */
		goto seize;
	}

	/* ask for channel */
	if (channel>0)
	{
		i = channel-1-(channel>16);
		if (p_m_mISDNport->b_port[i] == NULL)
			goto seize;
	}

	/* search for channel */
	i = 0;
	while(i < p_m_mISDNport->b_num)
	{
		if (!p_m_mISDNport->b_port[i])
		{
			channel = i+1+(i>=15);
			goto seize;
		}
		i++;
	}
	return(-34); /* no free channel */

seize:
	/* link Port */
	p_m_mISDNport->b_port[i] = this;
	p_m_b_index = i;
	p_m_b_channel = channel;
	p_m_b_exclusive = exclusive;
	p_m_b_stid = p_m_mISDNport->b_stid[i];
	p_m_b_addr = p_m_mISDNport->b_addr[i];
	p_m_jittercheck = 0;

	/* reserve channel */
	if (p_m_b_reserve == 0) // already reserved
	{
		p_m_b_reserve = 1;
		mISDNport->b_reserved++;
	}

	PDEBUG(DEBUG_BCHANNEL, "PmISDN(%s) seizing bchannel %d (index %d)\n", p_name, channel, i);

	return(channel);
}

/*
 * drop reserved channel and unset it.
 */
void PmISDN::drop_bchannel(void)
{
	/* unreserve channel */
	if (p_m_b_reserve)
		p_m_mISDNport->b_reserved--;
	p_m_b_reserve = 0;

	/* if not in use */
	if (!p_m_b_channel)
		return;

	PDEBUG(DEBUG_BCHANNEL, "PmISDN(%s) dropping bchannel\n", p_name);

	p_m_mISDNport->b_port[p_m_b_index] = NULL;
	p_m_b_index = -1;
	p_m_b_channel = 0;
	p_m_b_exclusive = 0;
	p_m_b_addr = 0;
	p_m_b_stid = 0;
}


/*
 * data is to be transmitted to the remote
 */
wech void Port::transmit(unsigned char *buffer, int length, int tonelength)
{
	/* send tone data to isdn device only if we have data, otherwhise we send nothing */
	if (tonelength>0 && (p_tone_fh>=0 || p_tone_fetched || p_m_crypt_msg_loops))
	{
		unsigned char buf[mISDN_HEADER_LEN+tonelength];
		iframe_t *frm = (iframe_t *)buf;

		if (p_m_crypt_msg_loops)
		{
			/* send pending message */
			int tosend;

			tosend = p_m_crypt_msg_len - p_m_crypt_msg_current;
			if (tosend > newlen)
				tosend = newlen;
			memcpy(p, p_m_crypt_msg+p_m_crypt_msg_current, tosend);
			p_m_crypt_msg_current += tosend;
			if (p_m_crypt_msg_current == p_m_crypt_msg_len)
			{
				p_m_crypt_msg_current = 0;
				p_m_crypt_msg_loops--;
			}
		}
		frm->prim = DL_DATA | REQUEST; 
		frm->addr = p_m_b_addr | FLG_MSG_DOWN;
		frm->dinfo = 0;
		frm->len = tonelength;
		memcpy(&frm->data.p, buffer, tonelength);
		mISDN_write(mISDNdevice, frm, mISDN_HEADER_LEN+frm->len, TIMEOUT_1SEC);

		if (p_debug_nothingtosend)
		{
			p_debug_nothingtosend = 0;
			PDEBUG((DEBUG_PORT | DEBUG_BCHANNEL), "PmISDN(%s) start sending, because we have tones and/or remote audio.\n", p_name);
		} 
	} else
	{
		if (!p_debug_nothingtosend)
		{
			p_debug_nothingtosend = 1;
			PDEBUG((DEBUG_PORT | DEBUG_BCHANNEL), "PmISDN(%s) stop sending, because we have only silence.\n", p_name);
		} 
	}
}


/*
 * handler
 */
int PmISDN::handler(void)
{
	struct message *message;
	int elapsed, length;

	if ((ret = Port::handler()))
		return(ret);

	/* send tone data to isdn device only if we have data */
	if (p_tone_fh>=0 || p_tone_fetched || p_m_crypt_msg_loops)
	{
		/* calculate how much to transmit */
		if (!p_last_tv.sec)
		{
			elapsed = ISDN_PRELOAD << 3; /* preload for the first time */
		} else
		{
			elapsed = 1000 * (now_tv.sec - p_last_tv_sec)
				+ (now_tv.usec/1000) - p_last_tv_msec;
			/* gap was greater preload, so only fill up to preload level */
			if (elapsed > ISDN_PRELOAD)
			{
				elapsed = ISDN_PRELOAD << 3
			}
		}
		if (elapsed >= ISDN_TRANSMIT)
		{
			unsigned char buf[mISDN_HEADER_LEN+(ISDN_PRELOAD<<3)];
			iframe_t *frm = (iframe_t *)buf;

			length = read_audio(buffer, elapsed);
			p_last_tv_sec = now_tv.sec;
			p_last_tv_msec = now_tv.usec/1000;

			if (p_m_crypt_msg_loops)
			{
				/* send pending message */
				int tosend;
	check!!
				tosend = p_m_crypt_msg_len - p_m_crypt_msg_current;
				if (tosend > length)
					tosend = length;
				memcpy(p, p_m_crypt_msg+p_m_crypt_msg_current, tosend);
				p_m_crypt_msg_current += tosend;
				if (p_m_crypt_msg_current == p_m_crypt_msg_len)
				{
					p_m_crypt_msg_current = 0;
					p_m_crypt_msg_loops--;
				}
			}
			frm->prim = DL_DATA | REQUEST; 
			frm->addr = p_m_b_addr | FLG_MSG_DOWN;
			frm->dinfo = 0;
			frm->len = length;
			memcpy(&frm->data.p, buffer, length);
			mISDN_write(mISDNdevice, frm, mISDN_HEADER_LEN+frm->len, TIMEOUT_1SEC);

			if (p_debug_nothingtosend)
			{
				p_debug_nothingtosend = 0;
				PDEBUG((DEBUG_PORT | DEBUG_BCHANNEL), "PmISDN(%s) start sending, because we have tones and/or remote audio.\n", p_name);
			} 
			return(1);
		}
	} else
	{
		p_last_tv.sec = p_last_tv.msec = 0; /* flag that we don't transmit data */
		if (!cwp_debug_nothingtosend)
		{
			p_debug_nothingtosend = 1;
			PDEBUG((DEBUG_PORT | DEBUG_BCHANNEL), "PmISDN(%s) stop sending, because we have only silence.\n", p_name);
		} 
	}

	// NOTE: deletion is done by the child class

	/* handle timeouts */
	if (p_m_timeout)
	{
		if (p_m_timer+p_m_timeout < now_d)
		{
			PDEBUG(DEBUG_ISDN, "(%s) timeout after %d seconds detected (state=%d).\n", p_name, p_m_timeout, p_state);
			p_m_timeout = 0;
			/* send timeout to endpoint */
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_TIMEOUT);
			message->param.state = p_state;
			message_put(message);
		}
		return(1);
	}
	
	return(0); /* nothing done */
}


/*
 * whenever we get audio data from bchannel, we process it here
 */
void PmISDN::bchannel_receive(iframe_t *frm)
{
	unsigned char *data_temp;
	unsigned long length_temp;
	struct message *message;
	struct timeval tv;
	struct timezone tz;
	long long jitter_now;
	int newlen;
	unsigned char *p;
	int l;
	unsigned long cont;
//	iframe_t rsp; /* response to possible indication */
#if 0
#warning BCHANNEL-DEBUG
{
	// check if we are part of all ports */
	class Port *port = port_first;
	while(port)
	{
		if (port==this)
			break;
		port=port->next;
	}
	if (!port)
	{
		PERROR_RUNTIME("**************************************************\n");
		PERROR_RUNTIME("*** BCHANNEL-DEBUG: !this! is not in list of ports\n");
		PERROR_RUNTIME("**************************************************\n");
		return;
	}
}
#endif


	if (frm->prim == (PH_CONTROL | INDICATION))
	{
		cont = *((unsigned long *)&frm->data.p);
		// PDEBUG(DEBUG_PORT, "PmISDN(%s) received a PH_CONTROL INDICATION 0x%x\n", p_name, cont);
		if ((cont&(~DTMF_TONE_MASK)) == DTMF_TONE_VAL)
		{
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_DTMF);
			message->param.dtmf = cont & DTMF_TONE_MASK;
			PDEBUG(DEBUG_PORT, "PmISDN(%s) PH_CONTROL  DTMF digit '%c'\n", p_name, message->param.dtmf);
			message_put(message);
		}
		switch(cont)
		{
			case BF_REJECT:
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_CRYPT);
			message->param.crypt.type = CC_ERROR_IND;
			PDEBUG(DEBUG_PORT, "PmISDN(%s) PH_CONTROL  reject of blowfish.\n", p_name);
			message_put(message);
			break;

			case BF_ACCEPT:
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_CRYPT);
			message->param.crypt.type = CC_ACTBF_CONF;
			PDEBUG(DEBUG_PORT, "PmISDN(%s) PH_CONTROL  accept of blowfish.\n", p_name);
			message_put(message);
			break;
		}
		return;
	}

	/* calls will not process any audio data unless
	 * the call is connected OR tones feature is enabled.
	 */
	if (p_state!=PORT_STATE_CONNECT
	 && !p_m_mISDNport->is_tones)
		return;

#if 0
	/* the bearer capability must be audio in order to send and receive
	 * audio prior or after connect.
	 */
	if (!(p_bearerinfo.capability&CLASS_CAPABILITY_AUDIO) && p_state!=PORT_STATE_CONNECT)
		return;
#endif

	/* if rx is off, it may happen that fifos send us pending informations, we just ignore them */
	if (p_m_rxoff)
	{
		PDEBUG(DEBUG_BCHANNEL, "PmISDN(%s) ignoring data, because rx is turned off\n", p_name);
		return;
	}

	/* randomize and listen to crypt message if enabled */
	if (p_m_crypt_listen)
	{
		/* the noisy randomizer */
		p = (unsigned char *)&frm->data.p;
		l = frm->len;
		while(l--)
			mISDN_rand[mISDN_rand_count & 0xff] += *p++;

		cryptman_listen_bch((unsigned char *)&frm->data.p, frm->len);
	}

	p = (unsigned char *)&frm->data.p;

	/* send data to epoint */
	if (p_m_calldata && ACTIVE_EPOINT(p_epointlist)) /* only if we have an epoint object */
	{
//printf("we are port %s and sending to epoint %d\n", p_m_cardname, p_epoint->serial);
		length_temp = frm->len;
		data_temp = p;
		while(length_temp)
		{
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_DATA);
			message->param.data.len = (length_temp>sizeof(message->param.data.data))?sizeof(message->param.data.data):length_temp;
			memcpy(message->param.data.data, data_temp, message->param.data.len);
			message->param.data.compressed = 1;
			message->param.data.port_id = p_serial;
			message->param.data.port_type = p_type;
			message_put(message);
			if (length_temp <= sizeof(message->param.data.data))
				break;
			data_temp += sizeof(message->param.data.data);
			length_temp -= sizeof(message->param.data.data);
		}
	}
#if 0
	/* response to the data indication */
	rsp.prim = frm->prim & 0xfffffffc | RESPONSE; 
	rsp.addr = frm->addr & INST_ID_MASK | FLG_MSG_DOWN;
	rsp.dinfo = frm->dinfo;
	rsp.len = 0;
	mISDN_write(mISDNdevice, &rsp, mISDN_HEADER_LEN+rsp.len, TIMEOUT_1SEC);
//PDEBUG(DEBUG_ISDN, "written %d bytes.\n", length);
#endif
}


/*
 * set echotest
 */
void PmISDN::set_echotest(int echo)
{
	if (p_m_echo != echo)
	{
		p_m_echo = echo;
		PDEBUG(DEBUG_ISDN, "we set echo to echo=%d.\n", p_m_echo);
		if (p_m_b_channel)
			if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
				ph_control(p_m_b_addr, p_m_echo?CMX_ECHO_ON:CMX_ECHO_OFF, 0);
	}
}

/*
 * set tone
 */
void PmISDN::set_tone(char *dir, char *tone)
{
	int id;

	if (!tone)
		tone = "";
	PDEBUG(DEBUG_ISDN, "isdn port now plays tone:'%s'.\n", tone);
	if (!tone[0])
	{
		id = TONE_OFF;
		goto setdsp;
	}

	/* check if we NOT really have to use a dsp-tone */
	if (!options.dsptones)
	{
		nodsp:
		if (p_m_tone)
		if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
		{
			PDEBUG(DEBUG_ISDN, "we reset tone from id=%d to OFF.\n", p_m_tone);
			ph_control(p_m_b_addr, TONE_PATT_OFF, 0);
		}
		p_m_tone = 0;
		Port::set_tone(dir, tone);
		return;
	}
	if (p_tone_dir[0])
		goto nodsp;

	/* now we USE dsp-tone, convert name */
	else if (!strcmp(tone, "dialtone"))
	{
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_DIALTONE; break;
		case DSP_GERMAN: id = TONE_GERMAN_DIALTONE; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDDIALTONE; break;
		}
	} else if (!strcmp(tone, "dialpbx"))
	{
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_DIALPBX; break;
		case DSP_GERMAN: id = TONE_GERMAN_DIALPBX; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDDIALPBX; break;
		}
	} else if (!strcmp(tone, "ringing"))
	{
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_RINGING; break;
		case DSP_GERMAN: id = TONE_GERMAN_RINGING; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDRINGING; break;
		}
	} else if (!strcmp(tone, "ringpbx"))
	{
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_RINGPBX; break;
		case DSP_GERMAN: id = TONE_GERMAN_RINGPBX; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDRINGPBX; break;
		}
	} else if (!strcmp(tone, "busy"))
	{
		busy:
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_BUSY; break;
		case DSP_GERMAN: id = TONE_GERMAN_BUSY; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDBUSY; break;
		}
	} else if (!strcmp(tone, "release"))
	{
		hangup:
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_AMERICAN_HANGUP; break;
		case DSP_GERMAN: id = TONE_GERMAN_HANGUP; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDHANGUP; break;
		}
	} else if (!strcmp(tone, "cause_10"))
		goto hangup;
	else if (!strcmp(tone, "cause_11"))
		goto busy;
	else if (!strcmp(tone, "cause_22"))
	{
		switch(options.dsptones) {
		case DSP_AMERICAN: id = TONE_SPECIAL_INFO; break;
		case DSP_GERMAN: id = TONE_GERMAN_GASSENBESETZT; break;
		case DSP_OLDGERMAN: id = TONE_GERMAN_OLDBUSY; break;
		}
	} else if (!strncmp(tone, "cause_", 6))
		id = TONE_SPECIAL_INFO;
	else
		id = TONE_OFF;

	/* if we have a tone that is not supported by dsp */
	if (id==TONE_OFF && tone[0])
		goto nodsp;

	setdsp:
	if (p_m_tone != id)
	{
		/* set new tone */
		p_m_tone = id;
		PDEBUG(DEBUG_ISDN, "we set tone to id=%d.\n", p_m_tone);
		if (p_m_b_channel)
			if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
				ph_control(p_m_b_addr, p_m_tone?TONE_PATT_ON:TONE_PATT_OFF, p_m_tone);
	}
	/* turn user-space tones off in cases of no tone OR dsp tone */
	Port::set_tone("",NULL);
}


/* MESSAGE_mISDNSIGNAL */
//extern struct message *dddebug;
void PmISDN::message_mISDNsignal(unsigned long epoint_id, int message_id, union parameter *param)
{
	switch(param->mISDNsignal.message)
	{
		case mISDNSIGNAL_VOLUME:
		if (p_m_txvol != param->mISDNsignal.txvol)
		{
			p_m_txvol = param->mISDNsignal.txvol;
			PDEBUG(DEBUG_BCHANNEL, "we change tx-volume to shift=%d.\n", p_m_txvol);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, VOL_CHANGE_TX, p_m_txvol);
		}
		if (p_m_rxvol != param->mISDNsignal.rxvol)
		{
			p_m_rxvol = param->mISDNsignal.rxvol;
			PDEBUG(DEBUG_BCHANNEL, "we change rx-volume to shift=%d.\n", p_m_rxvol);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, VOL_CHANGE_RX, p_m_rxvol);
		}
		break;

		case mISDNSIGNAL_CONF:
//if (dddebug) PDEBUG(DEBUG_ISDN, "dddebug = %d\n", dddebug->type);
//tone		if (!p_m_tone && p_m_conf!=param->mISDNsignal.conf)
		if (p_m_conf != param->mISDNsignal.conf)
		{
			p_m_conf = param->mISDNsignal.conf;
			PDEBUG(DEBUG_BCHANNEL, "we change conference to conf=%d.\n", p_m_conf);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, (p_m_conf)?CMX_CONF_JOIN:CMX_CONF_SPLIT, p_m_conf);
		}
		/* we must set, even if currently tone forbids conf */
		p_m_conf = param->mISDNsignal.conf;
//if (dddebug) PDEBUG(DEBUG_ISDN, "dddebug = %d\n", dddebug->type);
		break;

		case mISDNSIGNAL_CALLDATA:
		if (p_m_calldata != param->mISDNsignal.calldata)
		{
			p_m_calldata = param->mISDNsignal.calldata;
			PDEBUG(DEBUG_BCHANNEL, "we change to calldata=%d.\n", p_m_calldata);
			auch senden
		}
		break;
		
#if 0
		case mISDNSIGNAL_NODATA:
		p_m_nodata = param->mISDNsignal.nodata;
		if (p_m_txmix == p_m_nodata) /* txmix != !nodata */
		{
			p_m_txmix = !p_m_nodata;
			PDEBUG(DEBUG_BCHANNEL, "we change mix mode to txmix=%d (nodata=%d).\n", p_m_txmix, p_m_nodata);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, p_m_txmix?CMX_MIX_ON:CMX_MIX_OFF, 0);
		}
		break;
#endif

#if 0
		case mISDNSIGNAL_RXOFF:
		if (p_m_rxoff != param->mISDNsignal.rxoff)
		{
			p_m_rxoff = param->mISDNsignal.rxoff;
			PDEBUG(DEBUG_BCHANNEL, "we change receive mode to rxoff=%d.\n", p_m_rxoff);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, p_m_rxoff?CMX_RECEIVE_OFF:CMX_RECEIVE_ON, 0);
		}
		break;

		case mISDNSIGNAL_DTMF:
		if (p_m_dtmf != param->mISDNsignal.dtmf)
		{
			p_m_dtmf = param->mISDNsignal.dtmf;
			PDEBUG(DEBUG_BCHANNEL, "we change dtmf mode to dtmf=%d.\n", p_m_dtmf);
			if (p_m_b_channel)
				if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
					ph_control(p_m_b_addr, p_m_dtmf?DTMF_TONE_START:DTMF_TONE_STOP, 0);
		}
		break;

#endif
		default:
		PERROR("PmISDN(%s) unsupported signal message %d.\n", p_name, param->mISDNsignal.message);
	}
}

/* MESSAGE_CRYPT */
void PmISDN::message_crypt(unsigned long epoint_id, int message_id, union parameter *param)
{
	struct message *message;

	switch(param->crypt.type)
	{
		case CC_ACTBF_REQ:           /* activate blowfish */
		p_m_crypt = 1;
		p_m_crypt_key_len = param->crypt.len;
		if (p_m_crypt_key_len > (int)sizeof(p_m_crypt_key))
		{
			PERROR("PmISDN(%s) key too long %d > %d\n", p_name, p_m_crypt_key_len, sizeof(p_m_crypt_key));
			message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_CRYPT);
			message->param.crypt.type = CC_ERROR_IND;
			message_put(message);
			break;
		}
		memcpy(p_m_crypt_key, param->crypt.data, p_m_crypt_key_len);
		crypt_off:
		PDEBUG(DEBUG_BCHANNEL, "we set encryption to crypt=%d. (0 means OFF)\n", p_m_crypt);
		if (p_m_b_channel)
			if (p_m_mISDNport->b_state[p_m_b_index] == B_STATE_ACTIVE)
				ph_control_block(p_m_b_addr, p_m_crypt?BF_ENABLE_KEY:BF_DISABLE, p_m_crypt_key, p_m_crypt_key_len);
		break;

		case CC_DACT_REQ:            /* deactivate session encryption */
		p_m_crypt = 0;
		goto crypt_off;
		break;

		case CR_LISTEN_REQ:          /* start listening to messages */
		p_m_crypt_listen = 1;
		p_m_crypt_listen_state = 0;
		break;

		case CR_UNLISTEN_REQ:        /* stop listening to messages */
		p_m_crypt_listen = 0;
		break;

		case CR_MESSAGE_REQ:         /* send message */
		p_m_crypt_msg_len = cryptman_encode_bch(param->crypt.data, param->crypt.len, p_m_crypt_msg, sizeof(p_m_crypt_msg));
		if (!p_m_crypt_msg_len)
		{
			PERROR("PmISDN(%s) message too long %d > %d\n", p_name, param->crypt.len-1, sizeof(p_m_crypt_msg));
			break;
		}
		p_m_crypt_msg_current = 0; /* reset */
		p_m_crypt_msg_loops = 3; /* enable */
#if 0
		/* disable txmix, or we get corrupt data due to audio process */
		if (p_m_txmix)
		{
			PDEBUG(DEBUG_BCHANNEL, "for sending CR_MESSAGE_REQ, we reset txmix from txmix=%d.\n", p_m_txmix);
			ph_control(p_m_b_addr, CMX_MIX_OFF, 0);
		}
#endif
		break;

		default:
		PERROR("PmISDN(%s) unknown crypt message %d\n", p_name, param->crypt.type);
	}

}

/*
 * endpoint sends messages to the port
 */
int PmISDN::message_epoint(unsigned long epoint_id, int message_id, union parameter *param)
{
	if (Port::message_epoint(epoint_id, message_id, param))
		return(1);

	switch(message_id)
	{
		case MESSAGE_mISDNSIGNAL: /* user command */
		PDEBUG(DEBUG_ISDN, "PmISDN(%s) received special ISDN SIGNAL %d.\n", p_name, param->mISDNsignal.message);
		message_mISDNsignal(epoint_id, message_id, param);
		return(1);

		case MESSAGE_CRYPT: /* crypt control command */
		PDEBUG(DEBUG_ISDN, "PmISDN(%s) received encryption command '%d'.\n", p_name, param->crypt.type);
		message_crypt(epoint_id, message_id, param);
		return(1);
	}

	return(0);
}


/*
 * transmit function for data to mISDN b-channel
 */
void Port::transmit(unsigned char *buffer, int length)
{
}


/*
 * main loop for processing messages from mISDN device
 */
int mISDN_handler(void)
{
	int ret;
	msg_t *msg;
	iframe_t *frm;
	struct mISDNport *mISDNport;
	class PmISDN *isdnport;
	net_stack_t *nst;
	msg_t *dmsg;
	mISDNuser_head_t *hh;
	int i;

	/* the que avoids loopbacks when replying to stack after receiving
         * from stack. */
	mISDNport = mISDNport_first;
	while(mISDNport)
	{
		/* process turning on/off rx */
		i = 0;
		while(i < mISDNport->b_num)
		{
			if (mISDNport->b_port[i] && mISDNport->b_state[i] == B_STATE_ACTIVE)
			{
				isdnport=mISDNport->b_port[i];
				if (isdnport->p_m_calldata || isdnport->p_m_crypt_msg_loops || isdnport->p_m_crypt_listen || isdnport->p_record)
				{
					/* rx IS required */
					if (isdnport->p_m_rxoff)
					{
						/* turn on RX */
						isdnport->p_m_rxoff = 0;
						PDEBUG(DEBUG_BCHANNEL, "%s: receive data is required, so we turn them on\n");
						ph_control(isdnport->p_m_b_addr, CMX_RECEIVE_ON, 0);
						return(1);
					}
				} else
				{
					/* rx NOT required */
					if (!isdnport->p_m_rxoff)
					{
						/* turn off RX */
						isdnport->p_m_rxoff = 1;
						PDEBUG(DEBUG_BCHANNEL, "%s: receive data is not required, so we turn them off\n");
						ph_control(isdnport->p_m_b_addr, CMX_RECEIVE_OFF, 0);
						return(1);
					}
				}
			}
			i++;
		}
#if 0
		if (mISDNport->l1timeout && now>mISDNport->l1timeout)
		{
			PDEBUG(DEBUG_ISDN, "the L1 establish timer expired, we release all pending messages.\n", mISDNport->portnum);
			mISDNport->l1timeout = 0;
#endif

		if (mISDNport->l2establish)
		{
			if (now-mISDNport->l2establish > 5)
			{
				if (mISDNport->ntmode)
				{
					PDEBUG(DEBUG_ISDN, "the L2 establish timer expired, we try to establish the link NT portnum=%d.\n", mISDNport->portnum);
					time(&mISDNport->l2establish);
					/* establish */
					dmsg = create_l2msg(DL_ESTABLISH | REQUEST, 0, 0);
					if (mISDNport->nst.manager_l3(&mISDNport->nst, dmsg))
						free_msg(dmsg);
				} else {
					PDEBUG(DEBUG_ISDN, "the L2 establish timer expired, we try to establish the link TE portnum=%d.\n", mISDNport->portnum);
					time(&mISDNport->l2establish);
					/* establish */
					iframe_t act;
					act.prim = DL_ESTABLISH | REQUEST; 
					act.addr = (mISDNport->upper_id & ~LAYER_ID_MASK) | 3 | FLG_MSG_DOWN;
					act.dinfo = 0;
					act.len = 0;
					mISDN_write(mISDNdevice, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
				}
				return(1);
			}
		}
		if ((dmsg = msg_dequeue(&mISDNport->downqueue)))
		{
			if (mISDNport->ntmode)
			{
				hh = (mISDNuser_head_t *)dmsg->data;
				PDEBUG(DEBUG_ISDN, "sending queued NT l3-down-message: prim(0x%x) dinfo(0x%x) msg->len(%d)\n", hh->prim, hh->dinfo, dmsg->len);
				if (mISDNport->nst.manager_l3(&mISDNport->nst, dmsg))
					free_msg(dmsg);
			} else
			{
				frm = (iframe_t *)dmsg->data;
				frm->addr = mISDNport->upper_id | FLG_MSG_DOWN;
				frm->len = (dmsg->len) - mISDN_HEADER_LEN;
				PDEBUG(DEBUG_ISDN, "sending queued TE l3-down-message: prim(0x%x) dinfo(0x%x) msg->len(%d)\n", frm->prim, frm->dinfo, dmsg->len);
				mISDN_write(mISDNdevice, dmsg->data, dmsg->len, TIMEOUT_1SEC);
				free_msg(dmsg);
			}
			return(1);
		}
		mISDNport = mISDNport->next;
	} 

	/* get message from kernel */
	if (!(msg = alloc_msg(MAX_MSG_SIZE)))
		return(1);
	ret = mISDN_read(mISDNdevice, msg->data, MAX_MSG_SIZE, 0);
	if (ret < 0)
	{
		free_msg(msg);
		if (errno == EAGAIN)
			return(0);
		PERROR("FATAL ERROR: failed to do mISDN_read()\n");
		exit(-1); 
	}
	if (!ret)
	{
		free_msg(msg);
//		printf("%s: ERROR: mISDN_read() returns nothing\n");
		return(0);
	}
	msg->len = ret;
	frm = (iframe_t *)msg->data;

	/* global prim */
	switch(frm->prim)
	{
		case MGR_INITTIMER | CONFIRM:
		case MGR_ADDTIMER | CONFIRM:
		case MGR_DELTIMER | CONFIRM:
		case MGR_REMOVETIMER | CONFIRM:
//		if (options.deb & DEBUG_ISDN)
//			PDEBUG(DEBUG_ISDN, "timer-confirm\n");
		free_msg(msg);
		return(1);
	}

	/* find the port */
	mISDNport = mISDNport_first;
	while(mISDNport)
	{
		if ((frm->prim==(MGR_TIMER | INDICATION)) && mISDNport->ntmode)
		{
			itimer_t *it = mISDNport->nst.tlist;

			/* find timer */
			while(it)
			{
				if (it->id == (int)frm->addr)
					break;
				it = it->next;
			}
			if (it)
			{
				mISDN_write_frame(mISDNdevice, msg->data, mISDNport->upper_id | FLG_MSG_DOWN,
					MGR_TIMER | RESPONSE, 0, 0, NULL, TIMEOUT_1SEC);

				PDEBUG(DEBUG_ISDN, "timer-indication %s port %d it=%p\n", (mISDNport->ntmode)?"NT":"TE", mISDNport->portnum, it);
				test_and_clear_bit(FLG_TIMER_RUNING, (long unsigned int *)&it->Flags);
				ret = it->function(it->data);
				break;
			}
			/* we will continue here because we have a timer for a different mISDNport */
		}
//printf("comparing frm->addr %x with upper_id %x\n", frm->addr, mISDNport->upper_id);
		if ((frm->addr&STACK_ID_MASK) == (unsigned int)(mISDNport->upper_id&STACK_ID_MASK))
		{
			/* d-message */
			switch(frm->prim)
			{
				case MGR_SHORTSTATUS | INDICATION:
				case MGR_SHORTSTATUS | CONFIRM:
				switch(frm->dinfo) {
					case SSTATUS_L1_ACTIVATED:
					PDEBUG(DEBUG_ISDN, "Received SSTATUS_L1_ACTIVATED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
					goto ss_act;
					case SSTATUS_L1_DEACTIVATED:
					PDEBUG(DEBUG_ISDN, "Received SSTATUS_L1_DEACTIVATED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
					goto ss_deact;
					case SSTATUS_L2_ESTABLISHED:
					PDEBUG(DEBUG_ISDN, "Received SSTATUS_L2_ESTABLISHED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
					goto ss_estab;
					case SSTATUS_L2_RELEASED:
					PDEBUG(DEBUG_ISDN, "Received SSTATUS_L2_RELEASED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
					goto ss_rel;
				}
				break;

				case PH_ACTIVATE | CONFIRM:
				case PH_ACTIVATE | INDICATION:
				PDEBUG(DEBUG_ISDN, "Received PH_ACTIVATED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
				if (mISDNport->ntmode)
				{
					mISDNport->l1link = 1;
					setup_queue(mISDNport, 1);
					goto l1_msg;
				}
				ss_act:
				mISDNport->l1link = 1;
				setup_queue(mISDNport, 1);
				break;

				case PH_DEACTIVATE | CONFIRM:
				case PH_DEACTIVATE | INDICATION:
				PDEBUG(DEBUG_ISDN, "Received PH_DEACTIVATED for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
				if (mISDNport->ntmode)
				{
					mISDNport->l1link = 0;
					setup_queue(mISDNport, 0);
					goto l1_msg;
				}
				ss_deact:
				mISDNport->l1link = 0;
				setup_queue(mISDNport, 0);
				break;

				case PH_CONTROL | CONFIRM:
				case PH_CONTROL | INDICATION:
				PDEBUG(DEBUG_ISDN, "Received PH_CONTROL for port %d (%s).\n", mISDNport->portnum, mISDNport->ifport->interface->name);
				break;

				case DL_ESTABLISH | INDICATION:
				case DL_ESTABLISH | CONFIRM:
//				PDEBUG(DEBUG_ISDN, "addr 0x%x established data link (DL) TE portnum=%d (DL_ESTABLISH)\n", frm->addr, mISDNport->portnum);
				if (!mISDNport->ntmode) break; /* !!!!!!!!!!!!!!!! */
				ss_estab:
//				if (mISDNport->ntmode)
//					break;
				if (mISDNport->l2establish)
				{
					mISDNport->l2establish = 0;
					PDEBUG(DEBUG_ISDN, "the link became active before l2establish timer expiry.\n");
				}
				mISDNport->l2link = 1;
				break;

				case DL_RELEASE | INDICATION:
				case DL_RELEASE | CONFIRM:
//				PDEBUG(DEBUG_ISDN, "addr 0x%x released data link (DL) TE portnum=%d (DL_RELEASE)\n", frm->addr, mISDNport->portnum);
				if (!mISDNport->ntmode) break; /* !!!!!!!!!!!!!!!! */
				ss_rel:
//				if (mISDNport->ntmode)
//					break;
				mISDNport->l2link = 0;
				if (mISDNport->ptp)
				{
					time(&mISDNport->l2establish);
					PDEBUG(DEBUG_ISDN, "because we are ptp, we set a l2establish timer.\n");
				}
				break;

				default:
				l1_msg:
				PDEBUG(DEBUG_STACK, "GOT d-msg from %s port %d prim 0x%x dinfo 0x%x addr 0x%x\n", (mISDNport->ntmode)?"NT":"TE", mISDNport->portnum, frm->prim, frm->dinfo, frm->addr);
				if (frm->dinfo==(signed long)0xffffffff && frm->prim==(PH_DATA|CONFIRM))
				{
					PERROR("SERIOUS BUG, dinfo == 0xffffffff, prim == PH_DATA | CONFIRM !!!!\n");
				}
				/* d-message */
				if (mISDNport->ntmode)
				{
					/* l1-data enters the nt-mode library */
					nst = &mISDNport->nst;
					if (nst->l1_l2(nst, msg))
						free_msg(msg);
					return(1);
				} else
				{
					/* l3-data is sent to pbx */
					if (stack2manager_te(mISDNport, msg))
						free_msg(msg);
					return(1);
				}
			}
			break;
		}
//PDEBUG(DEBUG_ISDN, "flg:%d upper_id=%x addr=%x\n", (frm->addr&FLG_CHILD_STACK), (mISDNport->b_addr[0])&(~IF_CHILDMASK), (frm->addr)&(~IF_CHILDMASK));
		/* check if child, and if parent stack match */
		if ((frm->addr&FLG_CHILD_STACK) && (((unsigned int)(mISDNport->b_addr[0])&(~CHILD_ID_MASK)&STACK_ID_MASK) == ((frm->addr)&(~CHILD_ID_MASK)&STACK_ID_MASK)))
		{
			/* b-message */
			switch(frm->prim)
			{
				/* we don't care about confirms, we use rx data to sync tx */
				case PH_DATA | CONFIRM:
				case DL_DATA | CONFIRM:
				break;

				/* we receive audio data, we respond to it AND we send tones */
				case PH_DATA | INDICATION:
				case DL_DATA | INDICATION:
				case PH_CONTROL | INDICATION:
				i = 0;
				while(i < mISDNport->b_num)
				{
					if ((unsigned int)(mISDNport->b_addr[i]&STACK_ID_MASK) == (frm->addr&STACK_ID_MASK))
						break;
					i++;
				}
				if (i == mISDNport->b_num)
				{
					PERROR("unhandled b-message (address 0x%x).\n", frm->addr);
					break;
				}
				if (mISDNport->b_port[i])
				{
//PERROR("port sech: %s data\n", mISDNport->b_port[i]->p_name);
					mISDNport->b_port[i]->bchannel_receive(frm);
				} else
					PDEBUG(DEBUG_BCHANNEL, "b-channel is not associated to an ISDNPort (address 0x%x), ignoring.\n", frm->addr);
				break;

				case PH_ACTIVATE | INDICATION:
				case DL_ESTABLISH | INDICATION:
				case PH_ACTIVATE | CONFIRM:
				case DL_ESTABLISH | CONFIRM:
				PDEBUG(DEBUG_BCHANNEL, "DL_ESTABLISH confirm: bchannel is now activated (address 0x%x).\n", frm->addr);
				i = 0;
				while(i < mISDNport->b_num)
				{
					if ((unsigned int)(mISDNport->b_addr[i]&STACK_ID_MASK) == (frm->addr&STACK_ID_MASK))
						break;
					i++;
				}
				if (i == mISDNport->b_num)
				{
					PERROR("unhandled b-establish (address 0x%x).\n", frm->addr);
					break;
				}
				mISDNport->b_state[i] = B_STATE_ACTIVE;
				if (!mISDNport->b_port[i])
					bchannel_deactivate(mISDNport, i);
				else
					bchannel_activate(mISDNport, i);
				break;

				case PH_DEACTIVATE | INDICATION:
				case DL_RELEASE | INDICATION:
				case PH_DEACTIVATE | CONFIRM:
				case DL_RELEASE | CONFIRM:
				PDEBUG(DEBUG_BCHANNEL, "DL_RELEASE confirm: bchannel is now de-activated (address 0x%x).\n", frm->addr);
				i = 0;
				while(i < mISDNport->b_num)
				{
					if ((unsigned int)(mISDNport->b_addr[i]&STACK_ID_MASK) == (frm->addr&STACK_ID_MASK))
						break;
					i++;
				}
				if (i == mISDNport->b_num)
				{
					PERROR("unhandled b-release (address 0x%x).\n", frm->addr);
					break;
				}
				mISDNport->b_state[i] = B_STATE_IDLE;
				if (mISDNport->b_port[i])
					bchannel_activate(mISDNport, i);
				else
					bchannel_deactivate(mISDNport, i);
				break;
			}
			break;
		}

		mISDNport = mISDNport->next;
	} 
	if (!mISDNport)
	{
		if (frm->prim == (MGR_TIMER | INDICATION))
			PERROR("unhandled timer indication message: prim(0x%x) addr(0x%x) msg->len(%d)\n", frm->prim, frm->addr, msg->len);
		else
			PERROR("unhandled message: prim(0x%x) addr(0x%x) msg->len(%d)\n", frm->prim, frm->addr, msg->len);
//		PERROR("test: is_child: %x  of stack %x == %x (baddr %x frm %x)\n", (frm->addr&FLG_CHILD_STACK), ((unsigned int)(mISDNport_first->b_addr[0])&(~CHILD_ID_MASK)&STACK_ID_MASK), ((frm->addr)&(~CHILD_ID_MASK)&STACK_ID_MASK), mISDNport_first->b_addr[0], frm->addr);
	}

	free_msg(msg);
	return(1);
}


/*
 * global function to add a new card (port)
 */
struct mISDNport *mISDN_port_open(int port, int ptp, int ptmp)
{
	int ret;
	unsigned char buff[1025];
	iframe_t *frm = (iframe_t *)buff;
	stack_info_t *stinf;
	struct mISDNport *mISDNport, **mISDNportp;
	int i, cnt;
	layer_info_t li;
//	interface_info_t ii;
	net_stack_t *nst;
	manager_t *mgr;
	mISDN_pid_t pid;
	int pri = 0;
	int nt = 0;
	iframe_t dact;

	/* open mISDNdevice if not already open */
	if (mISDNdevice < 0)
	{
		ret = mISDN_open();
		if (ret < 0)
		{
			PERROR("cannot open mISDN device ret=%d errno=%d (%s) Check for mISDN modules!\nAlso did you create \"/dev/mISDN\"? Do: \"mknod /dev/mISDN c 46 0\"\n", ret, errno, strerror(errno));
			return(NULL);
		}
		mISDNdevice = ret;
		PDEBUG(DEBUG_ISDN, "mISDN device opened.\n");

		/* create entity for layer 3 TE-mode */
		mISDN_write_frame(mISDNdevice, buff, 0, MGR_NEWENTITY | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
		ret = mISDN_read_frame(mISDNdevice, frm, sizeof(iframe_t), 0, MGR_NEWENTITY | CONFIRM, TIMEOUT_1SEC);
		if (ret < (int)mISDN_HEADER_LEN)
		{
			noentity:
			fprintf(stderr, "cannot request MGR_NEWENTITY from mISDN. Exitting due to software bug.");
			exit(-1);
		}
		entity = frm->dinfo & 0xffff;
		if (!entity)
			goto noentity;
		PDEBUG(DEBUG_ISDN, "our entity for l3-processes is %d.\n", entity);
	}

	/* query port's requirements */
	cnt = mISDN_get_stack_count(mISDNdevice);
	if (cnt <= 0)
	{
		PERROR("Found no card. Please be sure to load card drivers.\n");
		return(NULL);
	}
	if (port>cnt || port<1)
	{
		PERROR("Port (%d) given at 'ports' (options.conf) is out of existing port range (%d-%d)\n", port, 1, cnt);
		return(NULL);
	}
	ret = mISDN_get_stack_info(mISDNdevice, port, buff, sizeof(buff));
	if (ret < 0)
	{
		PERROR("Cannot get stack info for port %d (ret=%d)\n", port, ret);
		return(NULL);
	}
	stinf = (stack_info_t *)&frm->data.p;
	switch(stinf->pid.protocol[0] & ~ISDN_PID_FEATURE_MASK)
	{
		case ISDN_PID_L0_TE_S0:
		PDEBUG(DEBUG_ISDN, "TE-mode BRI S/T interface line\n");
		break;
		case ISDN_PID_L0_NT_S0:
		PDEBUG(DEBUG_ISDN, "NT-mode BRI S/T interface port\n");
		nt = 1;
		break;
		case ISDN_PID_L0_TE_U:
		PDEBUG(DEBUG_ISDN, "TE-mode BRI U   interface line\n");
		break;
		case ISDN_PID_L0_NT_U:
		PDEBUG(DEBUG_ISDN, "NT-mode BRI U   interface port\n");
		nt = 1;
		break;
		case ISDN_PID_L0_TE_UP2:
		PDEBUG(DEBUG_ISDN, "TE-mode BRI Up2 interface line\n");
		break;
		case ISDN_PID_L0_NT_UP2:
		PDEBUG(DEBUG_ISDN, "NT-mode BRI Up2 interface port\n");
		nt = 1;
		break;
		case ISDN_PID_L0_TE_E1:
		PDEBUG(DEBUG_ISDN, "TE-mode PRI E1  interface line\n");
		pri = 1;
		break;
		case ISDN_PID_L0_NT_E1:
		PDEBUG(DEBUG_ISDN, "LT-mode PRI E1  interface port\n");
		pri = 1;
		nt = 1;
		break;
		default:
		PERROR("unknown port(%d) type 0x%08x\n", port, stinf->pid.protocol[0]);
		return(NULL);
	}
	if (nt)
	{
		/* NT */
		if (stinf->pid.protocol[1] == 0)
		{
			PERROR("Given port %d: Missing layer 1 NT-mode protocol.\n", port);
			return(NULL);
		}
		if (stinf->pid.protocol[2])
		{
			PERROR("Given port %d: Layer 2 protocol 0x%08x is detected, but not allowed for NT lib.\n", port, stinf->pid.protocol[2]);
			return(NULL);
		}
	} else
	{
		/* TE */
		if (stinf->pid.protocol[1] == 0)
		{
			PERROR("Given port %d: Missing layer 1 protocol.\n", port);
			return(NULL);
		}
		if (stinf->pid.protocol[2] == 0)
		{
			PERROR("Given port %d: Missing layer 2 protocol.\n", port);
			return(NULL);
		}
		if (stinf->pid.protocol[3] == 0)
		{
			PERROR("Given port %d: Missing layer 3 protocol.\n", port);
			return(NULL);
		} else
		{
			switch(stinf->pid.protocol[3] & ~ISDN_PID_FEATURE_MASK)
			{
				case ISDN_PID_L3_DSS1USER:
				break;

				default:
				PERROR("Given port %d: own protocol 0x%08x", port,stinf->pid.protocol[3]);
				return(NULL);
			}
		}
		if (stinf->pid.protocol[4])
		{
			PERROR("Given port %d: Layer 4 protocol not allowed.\n", port);
			return(NULL);
		}
	}

	/* add mISDNport structure */
	mISDNportp = &mISDNport_first;
	while(*mISDNportp)
		mISDNportp = &mISDNport->next;
	mISDNport = (struct mISDNport *)calloc(1, sizeof(struct mISDNport));
	if (!mISDNport)
	{
		PERROR("Cannot alloc mISDNport structure\n");
		return(NULL);
	}
	pmemuse++;
	memset(mISDNport, 0, sizeof(mISDNport));
	*mISDNportp = mISDNport;

	/* allocate ressources of port */
	msg_queue_init(&mISDNport->downqueue);
//	SCPY(mISDNport->name, "noname");
	mISDNport->portnum = port;
	mISDNport->ntmode = nt;
	mISDNport->pri = pri;
	mISDNport->d_stid = stinf->id;
	PDEBUG(DEBUG_ISDN, "d_stid = 0x%x.\n", mISDNport->d_stid);
	mISDNport->b_num = stinf->childcnt;
	PDEBUG(DEBUG_ISDN, "Port has %d b-channels.\n", mISDNport->b_num);
	if ((stinf->pid.protocol[2]&ISDN_PID_L2_DF_PTP) || (nt&&ptp) || pri)
	{
		PDEBUG(DEBUG_ISDN, "Port is point-to-point.\n");
		mISDNport->ptp = ptp = 1;
		if (ptmp && nt)
		{
			PDEBUG(DEBUG_ISDN, "Port is forced to point-to-multipoint.\n");
			mISDNport->ptp = ptp = 0;
		}
	}
	i = 0;
	while(i < stinf->childcnt)
	{
		mISDNport->b_stid[i] = stinf->child[i];
		PDEBUG(DEBUG_ISDN, "b_stid[%d] = 0x%x.\n", i, mISDNport->b_stid[i]);
		i++;
	}
	memset(&li, 0, sizeof(li));
	UCPY(&li.name[0], (nt)?"net l2":"pbx l4");
	li.object_id = -1;
	li.extentions = 0;
	li.pid.protocol[nt?2:4] = (nt)?ISDN_PID_L2_LAPD_NET:ISDN_PID_L4_CAPI20;
	li.pid.layermask = ISDN_LAYER((nt?2:4));
	li.st = mISDNport->d_stid;
	ret = mISDN_new_layer(mISDNdevice, &li);
	if (ret)
	{
		PERROR("Cannot add layer %d of port %d (ret %d)\n", nt?2:4, port, ret);
		closeport:
		mISDNport_close(mISDNport);
		return(NULL);
	}
	mISDNport->upper_id = li.id;
	ret = mISDN_register_layer(mISDNdevice, mISDNport->d_stid, mISDNport->upper_id);
	if (ret)
	{
		PERROR("Cannot register layer %d of port %d\n", nt?2:4, port);
		goto closeport;
	}
	mISDNport->lower_id = mISDN_get_layerid(mISDNdevice, mISDNport->d_stid, nt?1:3); // id of lower layer (nt=1, te=3)
	if (mISDNport->lower_id < 0)
	{
		PERROR("Cannot get layer(%d) id of port %d\n", nt?1:3, port);
		goto closeport;
	}
	mISDNport->upper_id = mISDN_get_layerid(mISDNdevice, mISDNport->d_stid, nt?2:4); // id of uppermost layer (nt=2, te=4)
	if (mISDNport->upper_id < 0)
	{
		PERROR("Cannot get layer(%d) id of port %d\n", nt?2:4, port);
		goto closeport;
	}
	PDEBUG(DEBUG_ISDN, "Layer %d of port %d added.\n", nt?2:4, port);

	/* if ntmode, establish L1 to send the tei removal during start */
	if (mISDNport->ntmode)
	{
		iframe_t act;
		/* L1 */
		act.prim = PH_ACTIVATE | REQUEST; 
		act.addr = mISDNport->upper_id | FLG_MSG_DOWN;
		printf("UPPER ID 0x%x, addr 0x%x\n",mISDNport->upper_id, act.addr);
		act.dinfo = 0;
		act.len = 0;
		mISDN_write(mISDNdevice, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
		usleep(10000); /* to be sure, that l1 is up */
	}

	/* create nst (nt-mode only) */
	if (nt)
	{
		mgr = &mISDNport->mgr;
		nst = &mISDNport->nst;

		mgr->nst = nst;
		nst->manager = mgr;

		nst->l3_manager = stack2manager_nt; /* messages from nt-mode */
		nst->device = mISDNdevice;
		nst->cardnr = port;
		nst->d_stid = mISDNport->d_stid;

		nst->feature = FEATURE_NET_HOLD;
		if (ptp)
			nst->feature |= FEATURE_NET_PTP;
		if (pri)
			nst->feature |= FEATURE_NET_CRLEN2 | FEATURE_NET_EXTCID;
#if 0
		i = 0;
		while(i < mISDNport->b_num)
		{
			nst->b_stid[i] = mISDNport->b_stid[i];
			i++;
		}
#endif
		nst->l1_id = mISDNport->lower_id;
		nst->l2_id = mISDNport->upper_id;

		/* phd */	
		msg_queue_init(&nst->down_queue);

		Isdnl2Init(nst);
		Isdnl3Init(nst);
	}

	/* if te-mode, query state link */
	if (!mISDNport->ntmode)
	{
		iframe_t act;
		/* L2 */
		PDEBUG(DEBUG_ISDN, "sending short status request for port %d.\n", port);
		act.prim = MGR_SHORTSTATUS | REQUEST; 
		act.addr = mISDNport->upper_id | MSG_BROADCAST;
		act.dinfo = SSTATUS_BROADCAST_BIT | SSTATUS_ALL;
		act.len = 0;
		mISDN_write(mISDNdevice, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
	}
	/* if ptp AND te-mode, pull up the link */
	if (mISDNport->ptp && !mISDNport->ntmode)
	{
		iframe_t act;
		/* L2 */
		act.prim = DL_ESTABLISH | REQUEST; 
		act.addr = (mISDNport->upper_id & ~LAYER_ID_MASK) | 4 | FLG_MSG_DOWN;
		act.dinfo = 0;
		act.len = 0;
		mISDN_write(mISDNdevice, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
	}
	/* if ptp AND nt-mode, pull up the link */
	if (mISDNport->ptp && mISDNport->ntmode)
	{
		msg_t *dmsg;
		/* L2 */
		dmsg = create_l2msg(DL_ESTABLISH | REQUEST, 0, 0);
		if (mISDNport->nst.manager_l3(&mISDNport->nst, dmsg))
			free_msg(dmsg);
	}
	/* initially, we assume that the link is down, exept for nt-ptmp */
	mISDNport->l2link = (mISDNport->ntmode && !mISDNport->ptp)?1:0;

	PDEBUG(DEBUG_BCHANNEL, "using 'mISDN_dsp.o' module\n");

	/* add all bchannel layers */
	i = 0;
	while(i < mISDNport->b_num)
	{
		/* create new layer */
		PDEBUG(DEBUG_BCHANNEL, "creating bchannel %d (index %d).\n" , i+1+(i>=15), i);
		memset(&li, 0, sizeof(li));
		memset(&pid, 0, sizeof(pid));
		li.object_id = -1;
		li.extentions = 0;
		li.st = mISDNport->b_stid[i];
		UCPY(li.name, "B L4");
		li.pid.layermask = ISDN_LAYER((4));
		li.pid.protocol[4] = ISDN_PID_L4_B_USER;
		ret = mISDN_new_layer(mISDNdevice, &li);
		if (ret)
		{
			failed_new_layer:
			PERROR("mISDN_new_layer() failed to add bchannel %d (index %d)\n", i+1+(i>=15), i);
			goto closeport;
		}
		mISDNport->b_addr[i] = li.id;
		if (!li.id)
		{
			goto failed_new_layer;
		}
		PDEBUG(DEBUG_BCHANNEL, "new layer (b_addr=0x%x)\n", mISDNport->b_addr[i]);

		/* create new stack */
		pid.protocol[1] = ISDN_PID_L1_B_64TRANS;
		pid.protocol[2] = ISDN_PID_L2_B_TRANS;
		pid.protocol[3] = ISDN_PID_L3_B_DSP;
		pid.protocol[4] = ISDN_PID_L4_B_USER;
		pid.layermask = ISDN_LAYER((1)) | ISDN_LAYER((2)) | ISDN_LAYER((3)) | ISDN_LAYER((4));
		ret = mISDN_set_stack(mISDNdevice, mISDNport->b_stid[i], &pid);
		if (ret)
		{
			stack_error:
			PERROR("mISDN_set_stack() failed (ret=%d) to add bchannel (index %d) stid=0x%x\n", ret, i, mISDNport->b_stid[i]);
			mISDN_write_frame(mISDNdevice, buff, mISDNport->b_addr[i], MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
			mISDNport->b_addr[i] = 0;
//			mISDNport->b_addr_low[i] = 0;
			goto closeport;
		}
		ret = mISDN_get_setstack_ind(mISDNdevice, mISDNport->b_addr[i]);
		if (ret)
			goto stack_error;

		/* get layer id */
		mISDNport->b_addr[i] = mISDN_get_layerid(mISDNdevice, mISDNport->b_stid[i], 4);
		if (!mISDNport->b_addr[i])
			goto stack_error;
		/* deactivate bchannel if already enabled due to crash */
		PDEBUG(DEBUG_BCHANNEL, "deactivating bchannel (index %d) as a precaution.\n", i);
		dact.prim = DL_RELEASE | REQUEST; 
		dact.addr = mISDNport->b_addr[i] | FLG_MSG_DOWN;
		dact.dinfo = 0;
		dact.len = 0;
		mISDN_write(mISDNdevice, &dact, mISDN_HEADER_LEN+dact.len, TIMEOUT_1SEC);

		i++;
	}
	PDEBUG(DEBUG_ISDN, "- port %d %s (%s) %d b-channels\n", mISDNport->portnum, (mISDNport->ntmode)?"NT-mode":"TE-mode", (mISDNport->ptp)?"Point-To-Point":"Multipoint", mISDNport->b_num);
	printlog("opening port %d %s (%s) %d b-channels\n", mISDNport->portnum, (mISDNport->ntmode)?"NT-mode":"TE-mode", (mISDNport->ptp)?"Point-To-Point":"Multipoint", mISDNport->b_num);
	return(mISDNport);
}


/*
 * function to free ALL cards (ports)
 */
void mISDNport_close_all(void)
{
	/* free all ports */
	while(mISDNport_first)
		mISDNport_close(mISDNport_first);
}

/*
 * free only one port
 */
void mISDNport_close(struct mISDNport *mISDNport)
{
	struct mISDNport **mISDNportp;
	class Port *port;
	classs PmISDN *pmISDN;
	net_stack_t *nst;
	unsigned char buf[32];
	int i;

	/* remove all port instance that are linked to this mISDNport */
	port = port_first;
	while(port)
	{
		if ((port->p_type&PORT_CLASS_MASK) == PORT_CLASS_mISDN)
		{
			pmISDN = (class PmISDN)*port;
			if (pmISDN->p_m_mISDNport)
			{
				PDEBUG(DEBUG_ISDN, "port %s uses mISDNport %d, destroying it.\n", pnISDN->p_name, mISDNport->portnum);
				delete pmISDN;
			}
		}
		port = port->next;
	}

	printlog("closing port %d\n", mISDNport->portnum);

	/* free bchannels */
	i = 0;
	while(i < mISDNport->b_num)
	{
		bchannel_deactivate(mISDNport, i);
		PDEBUG(DEBUG_BCHANNEL, "freeing %s port %d bchannel (index %d).\n", (mISDNport->ntmode)?"NT":"TE", mISDNport->portnum, i);
		if (mISDNport->b_stid[i])
		{
			mISDN_clear_stack(mISDNdevice, mISDNport->b_stid[i]);
			if (mISDNport->b_addr[i])
				mISDN_write_frame(mISDNdevice, buf, mISDNport->b_addr[i] | FLG_MSG_DOWN, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
		}
		i++;
	}

	/* free ressources of port */
	msg_queue_purge(&mISDNport->downqueue);

	/* free stacks */
	if (mISDNport->ntmode)
	{
		nst = &mISDNport->nst;
		if (nst->manager) /* to see if initialized */
		{
			PDEBUG(DEBUG_STACK, "the following messages are ok: one L3 process always exists (broadcast process) and some L2 instances (broadcast + current telephone's instances)\n");
			cleanup_Isdnl3(nst);
			cleanup_Isdnl2(nst);

			/* phd */
			msg_queue_purge(&nst->down_queue);
			if (nst->phd_down_msg)
				free(nst->phd_down_msg);
		}
	}

	PDEBUG(DEBUG_BCHANNEL, "freeing d-stack.\n");
	if (mISDNport->d_stid)
	{
//		mISDN_clear_stack(mISDNdevice, mISDNport->d_stid);
		if (mISDNport->lower_id)
			mISDN_write_frame(mISDNdevice, buf, mISDNport->lower_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
	}

	/* remove from list */
	mISDNportp = &mISDNport_first;
	while(*mISDNportp)
	{
		if (*mISDNportp == mISDNport)
		{
			*mISDNportp = (*mISDNportp)->next;
			break;
		}
		mISDNportp = &((*mISDNportp)->next);
	}

	if (!(*mISDNportp))
	{
		PERROR("software error, mISDNport not in list\n");
		exit(-1);
	}
	
	memset(mISDNport, 0, sizeof(struct mISDNport));
	free(mISDNport);
	pmemuse--;

	/* close mISDNdevice, if no port */
	if (mISDNdevice>=0 && mISDNport_first==NULL)
	{
		/* free entity */
		mISDN_write_frame(mISDNdevice, buf, 0, MGR_DELENTITY | REQUEST, entity, 0, NULL, TIMEOUT_1SEC);
		/* close device */
		mISDN_close(mISDNdevice);
		mISDNdevice = -1;
		PDEBUG(DEBUG_ISDN, "mISDN device closed.\n");
	}
}


/*
 * global function to show all available isdn ports
 */
void mISDN_port_info(void)
{
	int err;
	int i, ii, p;
	int useable, nt, pri;
	unsigned char buff[1025];
	iframe_t *frm = (iframe_t *)buff;
	stack_info_t *stinf;
	int device;

	/* open mISDN */
	if ((device = mISDN_open()) < 0)
	{
		fprintf(stderr, "cannot open mISDN device ret=%d errno=%d (%s) Check for mISDN modules!\nAlso did you create \"/dev/mISDN\"? Do: \"mknod /dev/mISDN c 46 0\"\n", device, errno, strerror(errno));
		exit(-1);
	}

	/* get number of stacks */
	i = 1;
	ii = mISDN_get_stack_count(device);
	printf("\n");
	if (ii <= 0)
	{
		printf("Found no card. Please be sure to load card drivers.\n");
	}

	/* loop the number of cards and get their info */
	while(i <= ii)
	{
		err = mISDN_get_stack_info(device, i, buff, sizeof(buff));
		if (err <= 0)
		{
			fprintf(stderr, "mISDN_get_stack_info() failed: port=%d err=%d\n", i, err);
			break;
		}
		stinf = (stack_info_t *)&frm->data.p;

		nt = pri = 0;
		useable = 1;

		/* output the port info */
		printf("Port %2d: ", i);
		switch(stinf->pid.protocol[0] & ~ISDN_PID_FEATURE_MASK)
		{
			case ISDN_PID_L0_TE_S0:
			printf("TE-mode BRI S/T interface line (for phone lines)");
#if 0
			if (stinf->pid.protocol[0] & ISDN_PID_L0_TE_S0_HFC & ISDN_PID_FEATURE_MASK)
				printf(" HFC multiport card");
#endif
			break;
			case ISDN_PID_L0_NT_S0:
			nt = 1;
			printf("NT-mode BRI S/T interface port (for phones)");
#if 0
			if (stinf->pid.protocol[0] & ISDN_PID_L0_NT_S0_HFC & ISDN_PID_FEATURE_MASK)
				printf(" HFC multiport card");
#endif
			break;
			case ISDN_PID_L0_TE_U:
			printf("TE-mode BRI U   interface line");
			break;
			case ISDN_PID_L0_NT_U:
			nt = 1;
			printf("NT-mode BRI U   interface port");
			break;
			case ISDN_PID_L0_TE_UP2:
			printf("TE-mode BRI Up2 interface line");
			break;
			case ISDN_PID_L0_NT_UP2:
			nt = 1;
			printf("NT-mode BRI Up2 interface port");
			break;
			case ISDN_PID_L0_TE_E1:
			pri = 1;
			printf("TE-mode PRI E1  interface line (for phone lines)");
#if 0
			if (stinf->pid.protocol[0] & ISDN_PID_L0_TE_E1_HFC & ISDN_PID_FEATURE_MASK)
				printf(" HFC-E1 card");
#endif
			break;
			case ISDN_PID_L0_NT_E1:
			nt = 1;
			pri = 1;
			printf("NT-mode PRI E1  interface port (for phones)");
#if 0
			if (stinf->pid.protocol[0] & ISDN_PID_L0_NT_E1_HFC & ISDN_PID_FEATURE_MASK)
				printf(" HFC-E1 card");
#endif
			break;
			default:
			useable = 0;
			printf("unknown type 0x%08x",stinf->pid.protocol[0]);
		}
		printf("\n");

		if (nt)
		{
			if (stinf->pid.protocol[1] == 0)
			{
				useable = 0;
				printf(" -> Missing layer 1 NT-mode protocol.\n");
			}
			p = 2;
			while(p <= MAX_LAYER_NR) {
				if (stinf->pid.protocol[p])
				{
					useable = 0;
					printf(" -> Layer %d protocol 0x%08x is detected, but not allowed for NT lib.\n", p, stinf->pid.protocol[p]);
				}
				p++;
			}
			if (useable)
			{
				if (pri)
					printf(" -> Interface is Point-To-Point (PRI).\n");
				else
					printf(" -> Interface can be Poin-To-Point/Multipoint.\n");
			}
		} else
		{
			if (stinf->pid.protocol[1] == 0)
			{
				useable = 0;
				printf(" -> Missing layer 1 protocol.\n");
			}
			if (stinf->pid.protocol[2] == 0)
			{
				useable = 0;
				printf(" -> Missing layer 2 protocol.\n");
			}
			if (stinf->pid.protocol[2] & ISDN_PID_L2_DF_PTP)
			{
				printf(" -> Interface is Poin-To-Point.\n");
			}
			if (stinf->pid.protocol[3] == 0)
			{
				useable = 0;
				printf(" -> Missing layer 3 protocol.\n");
			} else
			{
				printf(" -> Protocol: ");
				switch(stinf->pid.protocol[3] & ~ISDN_PID_FEATURE_MASK)
				{
					case ISDN_PID_L3_DSS1USER:
					printf("DSS1 (Euro ISDN)");
					break;

					default:
					useable = 0;
					printf("unknown protocol 0x%08x",stinf->pid.protocol[3]);
				}
				printf("\n");
			}
			p = 4;
			while(p <= MAX_LAYER_NR) {
				if (stinf->pid.protocol[p])
				{
					useable = 0;
					printf(" -> Layer %d protocol 0x%08x is detected, but not allowed for TE lib.\n", p, stinf->pid.protocol[p]);
				}
				p++;
			}
		}
		printf("  - %d B-channels\n", stinf->childcnt);

		if (!useable)
			printf(" * Port NOT useable for PBX\n");

		printf("--------\n");

		i++;
	}
	printf("\n");

	/* close mISDN */
	if ((err = mISDN_close(device)))
	{
		fprintf(stderr, "mISDN_close() failed: err=%d '%s'\n", err, strerror(err));
		exit(-1);
	}
}