[SIPForum-discussion] Response time for reliable and unreliable Provisional responses

[pradeep kumar]

Hi murali,

We are implemented three timers for a call.  The following timers are,

1. Timer A - 500 ms (INVITE request re transmission interval, when there is
no provisional response from carrier)
2. Timer B - 32000 ms (Transaction timeout, proxy will try for another
gateway)
3. Timer C - 180000 ms (Proxy transaction timeout, proxy will close the
call)

Thanks
Pradeep


On Fri, Oct 4, 2013 at 9:49 PM, Murali Natesh <murali87ece at gmail.com> wrote:

> Hi guys,
>
> Please help me to clear my doubts for the below behaviour.
>
> *1*.UAC/Proxy Sent a INVITE ,UAS replies with 183 Session Progress with
> SDP .
> Now
> what would be the Time which the UAC/Proxy has to wait for the Final
> Response 200 Ok or Error Response (4xx,5xx)  ?
>
> or
>
> *2*.Is Proxy/UAC dependent on  User HangUp ( on UAC side) to send a
> CANCEL after 30 to 45 seconds.
>
> In RFC 3261 its mentioned as "*For an INVITE transaction, if the response
> is a provisional
> response with status codes 101 to 199 inclusive (i.e., anything
> but 100), the proxy MUST reset timer C for that client
> transaction. The timer MAY be reset to a different value, but
> this value MUST be greater than 3 minutes*".
>
> or
> 3.UAS should send frequent provisional response to UAC till the final
> response to keep the session alive?
>
> 4.Is there any timers defined for reliable and unreliable Provisional
> responses?
>
>
> *--
> Thanks and Regards
> Murali
> *
>
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