Calling 9904, nothing happens because the SIP user "arno" doesn't exist in sip.conf: Set remote console verbosity to 9 == Using SIP RTP CoS mark 5 -- Executing [9904@tixe:1] Dial("SIP/amc-00000028", "SIP/932&SIP/amc&SIP/arno&SIP/930,30") in new stack == Using SIP RTP CoS mark 5 == Using SIP RTP CoS mark 5 == Using SIP RTP CoS mark 5 < Nothing happens, nothing rings here> # ADDING user [arno] to sip.conf (dummy/fake) pbx*CLI> sip reload # Calling 9904, it now calls. SIP user "arno" does exist in sip.conf, but isn't registered. Reloading SIP == Parsing '/etc/asterisk/sip.conf': Found == Using SIP CoS mark 4 == Using SIP RTP CoS mark 5 -- Executing [9904@tixe:1] Dial("SIP/amc-0000002b", "SIP/932&SIP/amc&SIP/arno&SIP/930,30") in new stack == Using SIP RTP CoS mark 5 == Using SIP RTP CoS mark 5 [Nov 20 13:28:52] WARNING[4875][C-00000012]: app_dial.c:2437 dial_exec_full: Unable to create channel of type 'SIP' (cause 20 - Subscriber absent) == Using SIP RTP CoS mark 5 -- Called SIP/932 -- Called SIP/amc -- Called SIP/930 -- Got SIP response 486 "Busy Here" back from 192.168.1.107:5060 -- SIP/amc-0000002d is busy -- SIP/930-0000002e is ringing -- SIP/932-0000002c is ringing -- SIP/932-0000002c is ringing == Spawn extension (tixe, 9904, 1) exited non-zero on 'SIP/amc-0000002b' # OK. # Back to first case with nonexistant SIP peer "arno": When calling 9904 from an IAX2 trunk, the trunk stays busy forever: # SETUP: [remotepbx] <-> IAX2 trunk <-> [localpbx] -> extension 9904 # Log below is from localpbx, verbosity 0 [Nov 20 12:43:35] WARNING[3545]: channel.c:1309 __ast_queue_frame: Exceptionally long voice queue length queuing to IAX2/ahlecuador-4809 [Nov 20 12:43:36] WARNING[3548]: channel.c:1309 __ast_queue_frame: Exceptionally long voice queue length queuing to IAX2/ahlecuador-4809 [Nov 20 12:43:37] WARNING[3544]: channel.c:1309 __ast_queue_frame: Exceptionally long voice queue length queuing to IAX2/ahlecuador-4809 [Nov 20 12:43:38] WARNING[3549]: channel.c:1309 __ast_queue_frame: Exceptionally long voice queue length queuing to IAX2/ahlecuador-4809 [Nov 20 12:33:26] WARNING[1222]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-5666 (type = 6, subclass = 11, ts=1769955, seqno=10) [Nov 20 12:33:26] WARNING[1223]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-13906 (type = 6, subclass = 2, ts=1700976, seqno=0) [Nov 20 12:33:33] WARNING[1224]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-531 (type = 6, subclass = 11, ts=139995, seqno=22) [Nov 20 12:33:35] WARNING[1217]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-13906 (type = 6, subclass = 11, ts=1709953, seqno=1) [Nov 20 12:33:36] WARNING[1223]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-5666 (type = 6, subclass = 11, ts=1779954, seqno=11) [Nov 20 12:33:40] WARNING[1218]: chan_iax2.c:3552 __attempt_transmit: Max retries exceeded to host 85.164.151.220 on IAX2/ahlecuador-531 (type = 6, subclass = 2, ts=146997, seqno=23) # and so on. # Actually have to restart localpbx asterisk service to get the trunk going again