Hi Fredick,

Your PBX is giving 504 Gateway timeout and not sure how it will solve the issue by sending the keep-alive.  Once the call answered if you want to send any KEEP alive for the particular call you can use SIP session timer. 

enable-timer

This enables or disables support for RFC 4028 SIP Session Timers.

<param name="enable-timer" value="false"/>
session-timeout

session timers for all call to expire after the specified seconds Then it will send another invite (re-invite). If not specified defaults to 30 minutes. Some gateways may reject values less than 30 minutes. This values refers to Session-Expires in RFC 4028(The time at which an element will consider the session timed out, if no successful session refresh transaction occurs beforehand)

<param name="session-timeout" value="1800"/>

But for your problem I strongly recommend you to check the issue in your PBX side where we are getting 504 error.

Regards

Paul 


On Thu, Apr 2, 2015 at 12:21 PM, Fredrik Larsson <fl@workmansoft.com> wrote:
This is the log as well:

2015-04-02 21:16:28.729469 [DEBUG] mod_httapi.c:1218 Process Tag: [playback]
66eb8d8c-51f1-4a96-af26-a76fd65f86c9 2015-04-02 21:16:28.729469 [DEBUG] switch_ivr_play_say.c:1314 Codec Activated L16@8000hz 1 channels 20ms
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:2749 tport_wakeup_pri() tport_wakeup_pri(02632630): events IN
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:2864 tport_recv_event() tport_recv_event(02632630)
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:3205 tport_recv_iovec() tport(02632630) msg 03CE6898 from (udp/10.98.7.37:5070) has 472 bytes, veclen = 1
recv 472 bytes from udp/[10.44.33.16]:5060 at 19:16:28.991477:
   ------------------------------------------------------------------------
   SIP/2.0 504 Gateway Timeout
   Via: SIP/2.0/UDP 10.98.7.37:5070;rport;branch=z9hG4bK3KvmXjNUaD61e
   From: "wm98991155" <sip:7411041111@10.98.7.37>;tag=3BU8reyaX4m6g
   Call-ID: e82eb3a4-540e-1233-2385-33f7f366dd04
   CSeq: 73664880 INVITE
   Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,INFO,NOTIFY,UPDATE
   Supported: timer
   Server: IP Office 9.0.5.0 build 972
   Reason: Q.850;cause=102;text="Recovery on timer expiry"
   To: <sip:9999@10.44.33.16>;tag=5c965d7da3a12d47
   Content-Length: 0
   
   ------------------------------------------------------------------------
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:3023 tport_deliver() tport(02632630): msg 03CE6898 (472 bytes) from udp/10.44.33.16:5070/sip next=00000000
..\..\sofia-sip\libsofia-sip-ua\nta\nta.c:3299 agent_recv_response() nta: received 504 Gateway Timeout for INVITE (73664880)
..\..\sofia-sip\libsofia-sip-ua\nta\nta.c:3366 agent_recv_response() nta: 504 Gateway Timeout is going to a transaction
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:4222 tport_release() tport(02632630): 03CE6078 by 027C4748 with 03CE6898
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:3257 tport_tsend() tport_tsend(02632630) tpn = UDP/10.44.33.16:5060
..\..\sofia-sip\libsofia-sip-ua\tport\tport.c:4680 tport_by_addrinfo() tport(02632630): not found by name UDP/10.44.33.16:5060
send 323 bytes to udp/[10.44.33.16]:5060 at 19:16:28.991477:
   ------------------------------------------------------------------------
   ACK sip:9999@10.44.33.16 SIP/2.0
   Via: SIP/2.0/UDP 10.98.7.37:5070;rport;branch=z9hG4bK3KvmXjNUaD61e
   Max-Forwards: 70
   From: "wm98991155" <sip:7411041111@10.98.7.37>;tag=3BU8reyaX4m6g
   To: <sip:9999@10.44.33.16>;tag=5c965d7da3a12d47
   Call-ID: e82eb3a4-540e-1233-2385-33f7f366dd04
   CSeq: 73664880 ACK
   Content-Length: 0
   
   ------------------------------------------------------------------------
..\..\sofia-sip\libsofia-sip-ua\nta\nta.c:8304 outgoing_send() nta: sent ACK (73664880) to UDP/10.44.33.16:5060
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1053 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
..\..\sofia-sip\libsofia-sip-ua\nua\nua_session.c:4139 signal_call_state_change() nua(01D997F0): call state changed: proceeding -> init
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1053 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1053 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
..\..\sofia-sip\libsofia-sip-ua\nua\nua_dialog.c:397 nua_dialog_usage_remove_at() nua(01D997F0): removing session usage
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] sofia.c:5840 Remote Reason: 102
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] sofia.c:6614 Channel sofia/internal/9999@10.44.33.16 entering state [terminated][504]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [NOTICE] sofia.c:7529 Hangup sofia/internal/9999@10.44.33.16 [CS_CONSUME_MEDIA] [RECOVERY_ON_TIMER_EXPIRE]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_channel.c:3222 Send signal sofia/internal/9999@10.44.33.16 [KILL]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1388 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
..\..\sofia-sip\libsofia-sip-ua\nua\nua_stack.c:529 nua_signal() nua(01D997F0): sent signal r_destroy
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:472 (sofia/internal/9999@10.44.33.16) Running State Change CS_HANGUP
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:735 (sofia/internal/9999@10.44.33.16) Callstate Change RINGING -> HANGUP
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:737 (sofia/internal/9999@10.44.33.16) State HANGUP
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] mod_sofia.c:413 Channel sofia/internal/9999@10.44.33.16 hanging up, cause: RECOVERY_ON_TIMER_EXPIRE
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:60 sofia/internal/9999@10.44.33.16 Standard HANGUP, cause: RECOVERY_ON_TIMER_EXPIRE
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:737 (sofia/internal/9999@10.44.33.16) State HANGUP going to sleep
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:504 (sofia/internal/9999@10.44.33.16) State Change CS_HANGUP -> CS_REPORTING
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1388 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:472 (sofia/internal/9999@10.44.33.16) Running State Change CS_REPORTING
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:823 (sofia/internal/9999@10.44.33.16) State REPORTING
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:104 sofia/internal/9999@10.44.33.16 Standard REPORTING, cause: RECOVERY_ON_TIMER_EXPIRE
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:823 (sofia/internal/9999@10.44.33.16) State REPORTING going to sleep
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:498 (sofia/internal/9999@10.44.33.16) State Change CS_REPORTING -> CS_DESTROY
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1388 Send signal sofia/internal/9999@10.44.33.16 [BREAK]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_session.c:1615 Session 3 (sofia/internal/9999@10.44.33.16) Locked, Waiting on external entities
2015-04-02 21:16:28.989475 [DEBUG] switch_ivr_originate.c:3695 Originate Resulted in Error Cause: 102 [RECOVERY_ON_TIMER_EXPIRE]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [NOTICE] switch_core_session.c:1633 Session 3 (sofia/internal/9999@10.44.33.16) Ended
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [NOTICE] switch_core_session.c:1637 Close Channel sofia/internal/9999@10.44.33.16 [CS_DESTROY]
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:626 (sofia/internal/9999@10.44.33.16) Running State Change CS_DESTROY
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:636 (sofia/internal/9999@10.44.33.16) State DESTROY
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] mod_sofia.c:323 sofia/internal/9999@10.44.33.16 SOFIA DESTROY
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:111 sofia/internal/9999@10.44.33.16 Standard DESTROY
285c3556-b081-4ac7-bd62-b82129f4f362 2015-04-02 21:16:28.989475 [DEBUG] switch_core_state_machine.c:636 (sofia/internal/9999@10.44.33.16) State DESTROY going to sleep




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