Hi, i install the Asterisk PBX on a linux machine with i4l to connect to PSTN (EuroISDN). And i configure a very simple dial plan in extension.conf. After this, i connect with a SIP program to asterisk and would call my cellular phone, but got this error: -- Executing Ringing("SIP/ACzerniak-0904", "") in new stack -- Executing Dial("SIP/ACzerniak-0904", "Modem/g1/01xxxxxxxxx") in new stack chan_modem.c:181 modem_call: Destination g1/01xxxxxxxxx requres a real destination (device:destination) -- Couldn't call g1/01xxxxxxxxx -- Hungup 'Modem[i4l]/ttyI1' == Everyone is busy at this time -- Executing Congestion("SIP/ACzerniak-0904", "") in new stack == Spawn extension (default, 901xxxxxxxxx, 3) exited non-zero on 'SIP/ACzerniak-0904' I change the TRUNK variable from Modem/g1 to Modem/ttyI[0|1], but this have the same effect. What means the "Destination g1/01xxxxx requires a _real_ destination" ? Thanks in advanced. Regards, Andreas. The modem.conf: [interfaces] context=remote driver=i4l dialtype=tone mode=immediate group=1 msn=85xxxxxx device => /dev/ttyI0 device => /dev/ttyI1 The extentsion.conf [globals] CONSOLE=Console/dsp ; Console interface for demo IAXINFO=guest ; IAXtel username/password TRUNK=Modem/g1 TRUNKMSD=1 ; MSD digits to strip (usually PHONE1=SIP/ACzerniak The [default] section includes: exten => _90ZXXXXXXXXX,1,Ringing ; read it from exten => _90ZXXXXXXXXX,2,Dial(${TRUNK}/${EXTEN:${TRUNKMSD}}) exten => _90ZXXXXXXXXX,3,Congestion -- "If you want to pray. Go to the sea." ---------------------------------------------------------------- Andreas Czerniak <cognac@amcs.net> PGPkey http://pgp5.ai.mit.edu:11371/pks/lookup?op=get&search=0xEDB224EC