[SIPForum-discussion] Simultenous UPDATE Handling

[Dasu B]

Hi Raj,

I agreed with Nitin, We must get ACk of 200 ok otherwise the call will fail
with below mentioned errors.
Can you please whether you are getting ack for 200 ok(Ans)
If you attach the ethereal trace so it easy to understand.
Ideally all Media stream (audio and video) offer in intailly Invite which is
supporting by B-party otherwise call scenario will be diffrent which you
attached..

Thanks
B Dasu

On Fri, May 28, 2010 at 11:21 PM, Nitin Kapoor <nitinkapoorr at gmail.com>wrote:

> Raj,
>
> Here is what my understanding says.
>
> In this kind of scenarios, additional rules apply to processing an UPDATE
> request with an offer when the gateway has sent a 200 OK response to an
> INVITE request but has not yet received an ACK. The following scenarios
> generate an error response.
>
> 1) If the initial INVITE request contains an offer but does not require
> provisional responses be sent reliably, then the SDP in the 200 OK is
> treated like an answer. If the UAS then receives an UPDATE request before an
> ACK response to the 200 OK, the UAS sends a 500 Server Internal error
> response with a Retry-After header.
>
> 2) If the initial INVITE does not contain an offer and does not require
> provisional responses be sent reliably, then the SDP in the 200 OK is
> treated like an offer. If the UAS then receives an UPDATE request before
> receiving an ACK to the 200 OK, the UAS sends a 491 Request Pending
> response.
>
> Now i might be wrong too. so lets wait for the others opinion.
>
> Thanks,
> Nitin Kapoor
>
>
>   On 28 May 2010 16:07, raj kumaradass <rajkumaradass at gmail.com> wrote:
>
>>  Greetings,
>>
>> Would like to know how the below scenario be handled, where both the ends
>> of a call send UPDATE msg(inorder to switch from established audio call to
>> video) simultaneously and the timing is more of alike a UPDATE response
>> received for a UPDATE req sent on both the entities.
>>
>>
>> UE-A
>>                                                UE-B
>>
>>       ---------------------INVITE(SDPoff - audio codecs) ------------>
>>
>>       <--------------------180(Ringing)
>> ---------------------------------------
>>
>>       <---------------------200 OK(SDPans - audio codecs) ---------
>>
>>       ---------------------UPDATE(SDPoff - Video codec) ---------->
>>
>>       <--------------------UPDATE(SDPoff - Video codec) ------------
>>
>>
>> Also please suggest if any standards/links which details out on handling
>> similiar scenarios.
>>
>>
>> thankS,
>> ...Raj
>>
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>
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