[SIPForum-discussion] Bye responce

[Chittaranjan Panda]

Hi Sam,

To avoid this kind of scenario , there are few mechanism are there. 
Session timer is there.

To check the session existence UAC or UAS. sends the Re-INVITE or update 
in a negotiated interval.
If receiving end sends 200 OK means the session exists. If 481 response 
then the session doesn't exists.

This is to avoid hung calls which happens due to missing release events 
in network.

Thanks,
-Chitta







Sam wrote:
> Hello,
>
> Let me give some more info on the query asked;
>
> 1. As asked by Vijay the proxy is stateful, and has record route 
> header and is without b2bua.
> 2. Debjit has said it quiet right and the senario looks like below;
>
> The  A (SIP) and B (PSTN - station or MS) are connected and call has 
> matured there is media flow ,but the  B
> gets disconnected due to network problem,now the B is a pstn point, 
> wherein he
> gets disconnected due to intermitent n/w problem at the 
> provider/carrier hop.(or could be the drop in wireless connectivity of MS)
> Now how the signaling will work as the timers are set on the proxy 
> ,will there be a bye to complete the transaction,
> or something else which will take account of it.
>
>
> Regards
> Sam
>
> On Sat, Feb 6, 2010 at 1:37 PM, Sameer Bhosle <u2nsam at gmail.com 
> <mailto:u2nsam at gmail.com>> wrote:
>
>     Hello,
>
>     For the non received bye request,how the call signaling will work.
>
>     after 200 Ok there is a bye initiated by user B but the user A
>     does not receive bye because of intermetant network problem,
>     also the proxy do not receives the bye,in this case proxy retransmits
>     the invite with the timer T1 set to 400,and T2 set to 8000,
>     what would happen with the signaling of the call and the transaction?
>     do the proxy will know the call terminate and responses.
>
>     Regards
>     Sam
>
>
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