[SIPForum-discussion] Offer/Answer Model

[Vivek Batra]

Hi Nora,
As the possibilities of SDP negotiation stated by you, how can SDP be
negotiated between 180 and ACK? Can you please explore??

--Vivek


On Thu, Aug 21, 2008 at 6:12 AM, 雨 陈 <chen.yu26 at yahoo.com.cn> wrote:

> Hi,
> According to the practical call flow, it seem the offer/answer model of
> SDP exchange can be found in INVITE/180, INVITE/200, 180/ACK or 200/ACK,
> even though the 180 response is provisional and sometimes the followed 200
> OK send the same SDP Msg to confirm it.
>
> Regards
>
> Nora
>
>
> *vijay kant gupta <vijaykant.it2002 at gmail.com>* 写道：
>
> See in Offer Answer Model. if u send invite without SDP at that time ACK
> has to contain SDP for A party.
> But if INVITE conatin SDP then 200 ok is Answer for Invite
> ACK is final ACKNOWLEDGE.
> On Wed, Aug 20, 2008 at 3:54 PM, zabi <mohamed.zabiulla at gmail.com> wrote:
>
>>    Dear All,
>>
>>     As per my knoweldge, Offer/Answer can occur in INVITE/2XX/ACK.
>>
>> Given a Sip message containing SDP how do we differentiate whether it is
>> an OFFER/ANSWER??
>>
>>
>> Regards,
>> Zabi
>>
>>
>>
>>
>>
>>
>> --
>> why run? you'll only die tired!!
>> Zabi.
>>
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