No this isn't valid. The offer must be answered.
This is the Session Initiation Protocol. Without an answer you have not
initiated a session.
Paul
NC Reddy wrote:
> Hi,
> I have the following context question:
>
> UAC <------------->AS(B2BUA)
> | ------F1 (INVITE)--->
> * SDP-Offer*
>
> <-----F2: 100 Trying---
>
> <----F3: 200 OK*(NO-SDP)*---- //Does this step is valid
> without SDP, ?:
>
> ------F4:ACK------------>
>
> Questions:
>
> - Does the 200 OK response without SDP -Answer is a "valid" sip response
> in the above context?.
> - If not what are the reason(s)?
>
> Regards
> Channa
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