[SIP Beyond VoIP] SDP in ACK instead of INVITE

Adrian Georgescu ag at ag-projects.com
Fri Jun 8 08:08:10 CEST 2012

MSRP media is no different than audio or video as far as the SIP protocol is concerned.

See call examples here:


There is no difference between different media type, each of them a description in the SDP.  Is best to avoid using ACK for the purposes of carrying SDP. Even if is legal protocol-wise it can only lead to failures. SDP should be present in INVITE and 200 OK. 


On Jun 8, 2012, at 7:58 AM, venu Y wrote:

> Hi all,
> I'm aware of VoIP call signalling when sender of the offer (INVITE) sends SDP in ACK instead of SETUP.
> Is this same case is a valid scenario for MSRP flow?
> If so, what should answrer respond?
> -- 
> With Regards
> Venu
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