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

[Kevin P. Fleming]

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.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
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