Call hangs after 30 seconds

• Check timeout - maybe call can't last more then 30s?
• Make sure call is made over SIP protocol
• Write down all IPs of all devices which participate in the session
• Enable sip debug (only for parties in the call, not global sip debug)

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• Look for BYE packet, who is sending it.
• If there is no BYE packet - big chance that problem is in the network - e.g. BYE packet does not reach our end or other end has problems with SIP protocol implementation
  • Check IP in SIP debug and compare to real IPs
  • If it is possible - try to capture SIP debug at the other end and compare to SIP debug in MOR

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If during the call you see similar line:

[Aug 13 14:19:34] NOTICE[15712]: chan_sip.c:15683 sip_poke_noanswer: Peer '148' is now UNREACHABLE!  Last qualify: 0 

That means that device become unreachable and connection lost. It should point to network problems.

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Such lines:

[Aug  6 11:50:43] NOTICE[22403]: chan_sip.c:2927 auto_congest: Auto-congesting SIP/prov253-0a1966d0
-- SIP/prov253-0a1966d0 is circuit-busy 
Scheduling destruction of SIP dialog '0ceffd014862f2c043209aa56d4930f4@82.194.82.123' in 32000 ms (Method: INVITE)

Clearly points that there is no response from dialed server, so timeout occurred.

Possible solutions:

• Check IP/port settings in configuration
• Check network settings (bad routing/bad settings/etc)
• Change device at the other end

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See also:

• Maximum retries exceeded on transmission
• SIP call flow
• SIP INVITE
• SIP Retransmists