[SIPForum-discussion] Query Regarding SIP Registration

Sebastian Hauret seba.hauret at gmail.com
Mon Aug 5 13:53:31 UTC 2013

It can be possible to define heartbeats (at network, transport or
application layer) in some situations to detect if some IP phone or SIP
trunk is reacheable but it is related to implementation.

As far as I know, on normal behaviour until reach "registration expiration"
time or until Phone A sends REGISTER with "Expires = 0" (UNREGISTER),
registrar server considered that Phone A is reacheable on application layer.


2013/8/1 mahesh b <mahesh.b.2487 at gmail.com>

> Hi All..
>          A sip client say Phone A (wireless) is registered to the
> server(Which acts as a Registrar Server as well as Proxy). Now say Phone B
> which is registered to the same server
> wants to make a call to Phone A.  At this instance if Proxy Server is not
> able to reach Phone A suppose.(due to some TCP connection error at client
> side, which is detected
> at server side). And Say suppose Registration Expiration for the client is
> 3600 Seconds.
>          Now if the client continues to be in this state( i mean some tcp
> connectoin errors). And Proxy is not able to reach the client to forward an
> INVITE to it. From Proxy perspective(or Register Server )the client is
> still Registered?
> Regards,
> Mahesh.B
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