SIP trace:

#
U 2014/04/10 10:19:43.079198 2.2.2.2:5062 -> 1.1.1.1:5080
SIP/2.0 480 Temporarily not available.
Via: SIP/2.0/UDP 1.1.1.1:5080;rport=5080;branch=z9hG4bKBXQm2F3cHgFcK.
From: "+111111111111" <sip:+111111111111@1.1.1.1>;tag=t8yp14HU53Xrj.
To: <sip:+222222222222@4.4.4.4:5060>;tag=gK0699dffd.
Call-ID: 5f60343b-3b3c-1232-d9ba-020820d8e22d.
CSeq: 58226505 INVITE.
Reason: Q.850;cause=19.
Content-Length: 0.
.

#
U 2014/04/10 10:19:43.084570 1.1.1.1:5060 -> 2.2.2.2:5060
SIP/2.0 480 Temporarily Unavailable.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK26dc.1612d515.0.
Via: SIP/2.0/UDP 3.3.3.3:5060;branch=z9hG4bK420c53ac;rport=5060.
Max-Forwards: 16.
From: "pbx234" <sip:111111111111@3.3.3.3>;tag=as333cf884.
To: <sip:0599#222222222222@2.2.2.2:5060>;tag=veXaXcyc8118e.
Call-ID: 6c86be36267a0f6d54a34060364a3490@3.3.3.3:5060.
CSeq: 102 INVITE.
User-Agent: FS.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY.
Supported: timer, precondition, path, replaces.
Allow-Events: talk, hold, conference, refer.
Reason: Q.850;cause=16;text="NORMAL_CLEARING".
Content-Length: 0.
Remote-Party-ID: "Outbound Call" <sip:222222222222@2.2.2.2>;party=calling;privacy=off;screen=no.

2014-04-10 10:50:03.470035 [DEBUG] sofia.c:4937 Remote Reason: 19
2014-04-10 10:50:03.490051 [ALERT] switch_ivr.c:828 sofia/external/222222222222@2.2.2.2:5062 receive message [SIGNAL_DATA]
2014-04-10 10:50:03.490051 [DEBUG] sofia.c:5719 Channel sofia/external/222222222222@2.2.2.2:5062 entering state [terminated][480]
2014-04-10 10:50:03.490051 [NOTICE] sofia.c:6528 Hangup sofia/external/222222222222@2.2.2.2:5062 [CS_EXCHANGE_MEDIA] [NO_ANSWER]
2014-04-10 10:50:03.490051 [DEBUG] switch_channel.c:3130 Send signal sofia/external/222222222222@2.2.2.2:5062 [KILL]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_session.c:1334 Send signal sofia/external/222222222222@2.2.2.2:5062 [BREAK]
2014-04-10 10:50:03.490051 [ALERT] switch_ivr.c:828 sofia/external/222222222222@2.2.2.2:5062 receive message [SIGNAL_DATA]
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:557 sofia/external/222222222222@2.2.2.2:5062 ending bridge by request from write function
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:633 BRIDGE THREAD DONE [sofia/external/222222222222@2.2.2.2:5062]
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:658 Send signal sofia/internal/111111111111@1.1.1.1:5060 [BREAK]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:480 (sofia/external/222222222222@2.2.2.2:5062) State EXCHANGE_MEDIA going to sleep
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:415 (sofia/external/222222222222@2.2.2.2:5062) Running State Change CS_HANGUP
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:633 BRIDGE THREAD DONE [sofia/internal/111111111111@1.1.1.1:5060]
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:658 Send signal sofia/external/222222222222@2.2.2.2:5062 [BREAK]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:678 (sofia/external/222222222222@2.2.2.2:5062) State HANGUP
2014-04-10 10:50:03.490051 [DEBUG] mod_sofia.c:504 Channel sofia/external/222222222222@2.2.2.2:5062 hanging up, cause: NO_ANSWER
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:48 sofia/external/222222222222@2.2.2.2:5062 Standard HANGUP, cause: NO_ANSWER
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:678 (sofia/external/222222222222@2.2.2.2:5062) State HANGUP going to sleep
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:689 (sofia/external/222222222222@2.2.2.2:5062) Callstate Change EARLY -> HANGUP
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:446 (sofia/external/222222222222@2.2.2.2:5062) State Change CS_HANGUP -> CS_REPORTING
2014-04-10 10:50:03.490051 [DEBUG] switch_core_session.c:1334 Send signal sofia/external/222222222222@2.2.2.2:5062 [BREAK]
2014-04-10 10:50:03.490051 [ALERT] switch_ivr_bridge.c:1521 sofia/external/222222222222@2.2.2.2:5062 receive message [UNBRIDGE]
2014-04-10 10:50:03.490051 [DEBUG] switch_ivr_bridge.c:1521 sofia/external/222222222222@2.2.2.2:5062 skip receive message [UNBRIDGE] (channel is hungup already)
2014-04-10 10:50:03.490051 [ALERT] switch_ivr_bridge.c:1524 sofia/internal/111111111111@1.1.1.1:5060 receive message [UNBRIDGE]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_session.c:854 Send signal sofia/internal/111111111111@1.1.1.1:5060 [BREAK]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:415 (sofia/external/222222222222@2.2.2.2:5062) Running State Change CS_REPORTING
2014-04-10 10:50:03.490051 [ALERT] switch_core_session.c:2732 sofia/internal/111111111111@1.1.1.1:5060 receive message [APPLICATION_EXEC_COMPLETE]
2014-04-10 10:50:03.490051 [NOTICE] switch_core_state_machine.c:262 sofia/internal/111111111111@1.1.1.1:5060 has executed the last dialplan instruction, hanging up.
2014-04-10 10:50:03.490051 [NOTICE] switch_core_state_machine.c:264 Hangup sofia/internal/111111111111@1.1.1.1:5060 [CS_EXECUTE] [NORMAL_CLEARING]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:761 (sofia/external/222222222222@2.2.2.2:5062) State REPORTING
2014-04-10 10:50:03.490051 [DEBUG] switch_channel.c:3130 Send signal sofia/internal/111111111111@1.1.1.1:5060 [KILL]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_session.c:1334 Send signal sofia/internal/111111111111@1.1.1.1:5060 [BREAK]
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:477 (sofia/internal/111111111111@1.1.1.1:5060) State EXECUTE going to sleep
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:415 (sofia/internal/111111111111@1.1.1.1:5060) Running State Change CS_HANGUP
2014-04-10 10:50:03.490051 [DEBUG] switch_core_state_machine.c:678 (sofia/internal/111111111111@1.1.1.1:5060) State HANGUP
2014-04-10 10:50:03.490051 [DEBUG] mod_sofia.c:498 sofia/internal/111111111111@1.1.1.1:5060 Overriding SIP cause 480 with 480 from the other leg
2014-04-10 10:50:03.490051 [DEBUG] mod_sofia.c:504 Channel sofia/internal/111111111111@1.1.1.1:5060 hanging up, cause: NORMAL_CLEARING
2014-04-10 10:50:03.490051 [DEBUG] mod_sofia.c:638 Responding to INVITE with: 480