[SIPForum-discussion] Bye responce

[Umang]

The quick response, A should eventually time out if it doesn't receive RTP,
Comfort Noise, or Keep Alives.

I have done some preliminary R&D on this (many years ago) & I would assume
that your UA's are utilizing comfort noise - RFC 3389?  If so, consider the
following example:

-Call is established between A & B (doesn't matter who initiates)
-User on B does not generate any voice & therefore UA on B begins to
transmit Comfort Nose packets every 200 ms.
-A receives comfort noise packets every 200 ms (which also indicate to A
that the call is still active)
-If no comfort noise, or RTP w/voice payload, packets were being received by
A for interval X, it would eventually timeout.

Umang Patel | MIT | Communications Research Engineer



On Mon, Feb 8, 2010 at 10:28 PM, Sam <u2nsam at gmail.com> 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> 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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