[SIPForum-discussion] Can both 180 & 200 contain SDP?

[Tomasz Zieleniewski]

Aspect we are considering affects both UAC and UAS.
Of course UAC must wait for 200 OK to complete transaction.
When UAS send provisional response and inserts SDP inside it
then it must insert the same SDP in final response just to make sure UAC
gets it anyway.
That is why if UAC receives SDP in provisional response it knows that
UAS will insert the same SDP in 200 OK. So it waits for 200 OK to finish
transaction
and don't need to evaluate SDP again.

Kind regards,
- Tomasz


2009/5/9 AMIT ANAND <amiit.anand at gmail.com>

> Totally Agree with Marien, SDP in 200OK will get edge over the one in 180
> and UAC has to wait for 200 OK to get final SDP.
>
> Thanks
> Amit
>
>
> On Fri, May 8, 2009 at 12:14 PM, Martien Huysmans <
> martien.huysmans at ericsson.com> wrote:
>
>>  Tomasz
>>
>> Agree, but as the provisional response is not send reliable, the UAS can
>> not know if
>> it arrives. Because of that the "final SDP answer" also has to be included
>> a reliable
>> non-failure message (200 OK for RFC3261).
>> Something else to take into account is that a new offer-answer cycle can
>> only start after the
>> SDP has been send / received reliable. So (in case of RFC3261), the UAC
>> has to wait
>> until 200OK (with final SDP), even if it already has received the SDP in a
>> provisional response.
>>
>> Regards Martien
>>
>>  ------------------------------
>>  *From:* Tomasz Zieleniewski [mailto:tzieleniewski at gmail.com]
>> *Sent:* Monday, May 04, 2009 10:28 PM
>> *To:* Martien Huysmans
>>
>> *Cc:* SIP FORUM
>> *Subject:* Re: [SIPForum-discussion] Can both 180 & 200 contain SDP?
>>
>> Hi,
>>
>> According to the same clause 13.2.1 from RFC 3261
>> the same SDP answer may be placed in any provisional response.
>> In this case UAC must treat the first received SDP as final one and must
>> ingnore any further responses.
>>
>> Kind regards,
>> - Tomasz
>>
>> 2009/5/4 Martien Huysmans <martien.huysmans at ericsson.com>
>>
>>>  Hi
>>>
>>> Please take into account that the SDP must be send in a reliable
>>> non-failure message from the UAS.
>>> See RFC3261-clause 13.2.1
>>>
>>> Regards Martien
>>>
>>>  ------------------------------
>>> *From:* discussion-bounces at sipforum.org [mailto:
>>> discussion-bounces at sipforum.org] *On Behalf Of *Tomasz Zieleniewski
>>> *Sent:* Monday, May 04, 2009 9:12 AM
>>> *To:* amirul ahsan
>>> *Cc:* SIP FORUM
>>> *Subject:* Re: [SIPForum-discussion] Can both 180 & 200 contain SDP?
>>>
>>>   Hi,
>>>
>>> UAS may send SDP in 180 Session Progress response.
>>> UAC must then treat those media description as the final one
>>> and must ignore any SDP in subsequent responses.
>>>
>>> Kind regards,
>>> Tomasz Zieleniewski
>>>
>>>
>>> 2009/5/3 amirul ahsan <panna108 at yahoo.com>
>>>
>>>>   HI,
>>>>
>>>> Plz let me know, if both 180 Ringing & 200 Ok cantain SDP .
>>>>
>>>> Thanks in advance.
>>>>
>>>> // BR,
>>>>
>>>> Amirul
>>>>
>>>>
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