[SIPForum-discussion] Is (200)Ok without Ringing (180, 183) a right approach?

[Victor Pascual Avila]

On Fri, Sep 17, 2010 at 4:35 PM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> On 09/16/2010 05:44 PM, Rob Maxwell wrote:
>> In  other protocols, (ISUP / ISDN), this call flow is called "fast answer".
>>
>> It is allowed as long as the answer, 200 OK, has SDP.
>
> The 200 OK response *must* have an SDP offer or answer, regardless of
> whether there were any provisional responses, or whether they contained
> an SDP offer or answer.

Unless the UAS sent the answer in a reliable provisional response.

Cheers,
-- 
Victor Pascual Ávila