Does this help?
To: “100” sip:[email protected]:5160;tag=c9f0c2a94ed4e32
Call-ID: [email protected]
CSeq: 505 NOTIFY
User-Agent: Sangoma S500 V2.0.4.15
Allow: INVITE, ACK, UPDATE, INFO, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE, PRACK
Content-Length: 0
<------------->
[2017-02-21 17:10:13] VERBOSE[24154] chan_sip.c: — (9 headers 0 lines) —
[2017-02-21 17:10:13] VERBOSE[24154] chan_sip.c:
<— SIP read from UDP:10.10.10.149:5060 —>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.10.10.137:5160;branch=z9hG4bK480ee3fb
From: sip:[email protected]:5160;tag=as31ab7565
To: “100” sip:[email protected]:5160;tag=445accec384ae76
Call-ID: [email protected]
CSeq: 506 NOTIFY
User-Agent: Sangoma S500 V2.0.4.15
Allow: INVITE, ACK, UPDATE, INFO, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE, PRACK
Content-Length: 0
<------------->
[2017-02-21 17:10:13] VERBOSE[24154] chan_sip.c: — (9 headers 0 lines) —
[2017-02-21 17:10:13] VERBOSE[24154] chan_sip.c:
<— SIP read from UDP:10.10.10.149:5060 —>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.10.10.137:5160;branch=z9hG4bK4f9a16ab
From: sip:[email protected]:5160;tag=as2fdf6ef5
To: “100” sip:[email protected]:5160;tag=fbe015b0718f77f
Call-ID: [email protected]
CSeq: 481 NOTIFY
User-Agent: Sangoma S500 V2.0.4.15
Allow: INVITE, ACK, UPDATE, INFO, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE, PRACK
Content-Length: 0
<------------->
[2017-02-21 17:10:13] VERBOSE[24154] chan_sip.c: — (9 headers 0 lines) —
[2017-02-21 17:10:13] VERBOSE[24156][C-00000102] sig_pri.c: Span 2: Channel 0/2 got hangup request, cause 41
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] app_dial.c: DAHDI/i2/07966661776-80 is circuit-busy
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_dahdi.c: Hungup ‘DAHDI/i2/07966661776-80’
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] app_dial.c: Everyone is busy/congested at this time (1:0/1/0)
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [s@macro-dialout-trunk:24] NoOp(“SIP/100-0000017a”, “Dial failed for some reason with DIALSTATUS = CONGESTION and HANGUPCAUSE = 41”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [s@macro-dialout-trunk:25] GotoIf(“SIP/100-0000017a”, “0?continue,1:s-CONGESTION,1”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx_builtins.c: Goto (macro-dialout-trunk,s-CONGESTION,1)
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [s-CONGESTION@macro-dialout-trunk:1] Set(“SIP/100-0000017a”, “RC=41”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [s-CONGESTION@macro-dialout-trunk:2] Goto(“SIP/100-0000017a”, “41,1”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx_builtins.c: Goto (macro-dialout-trunk,41,1)
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [41@macro-dialout-trunk:1] Goto(“SIP/100-0000017a”, “continue,1”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx_builtins.c: Goto (macro-dialout-trunk,continue,1)
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [continue@macro-dialout-trunk:1] NoOp(“SIP/100-0000017a”, “TRUNK Dial failed due to CONGESTION HANGUPCAUSE: 41 - failing through to other trunks”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [continue@macro-dialout-trunk:2] ExecIf(“SIP/100-0000017a”, “1?Set(CALLERID(number)=100)”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [07966661776@from-internal:8] Macro(“SIP/100-0000017a”, “outisbusy,”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] pbx.c: Executing [s@macro-outisbusy:1] Progress(“SIP/100-0000017a”, “”) in new stack
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c: Audio is at 11002
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c: Adding codec ulaw to SDP
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c: Adding codec alaw to SDP
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c: Adding codec g726 to SDP
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c: Adding non-codec 0x1 (telephone-event) to SDP
[2017-02-21 17:10:13] VERBOSE[3435][C-00000102] chan_sip.c:
<— Transmitting (no NAT) to 10.10.10.149:5060 —>