[Sip-implementors] Question: Does 200 OK(INVITE) without SDP is valid response for INVITE with SDP offer?

[NC Reddy]

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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