[SIPForum-discussion] SIP trunk heartbeat mechanism

[Federico Aicardi]

Hello all,

I would like to know if there is some RFC that describes the heartbeat
mechanism in a SIP trunk (device level heartbeat).
Particularly, I have a doubt, the scenario is the following,

   1. SIP server sends the OPTION heartbeat message
   2. IP PBX responds with a 503 "Service unavailable"

SIP server should assume that the SIPTG is down or the status should be
normal as the peer device responds? Is there any RFC which specifies this
procedure?

Thanks to all.

Best regards,
Federico
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