RFC doesnt put any restriction regarding this. It doesnt make much sense apart from the following scenario i can think of.
Say, UAC just wants to check if the UAS is available or not, and then when UAS responds with 200 ok, UAC negotiates the capabilities; ie UAC doesnt want to negotiate media unless it knows for sure UAS is available. Here we may think that INVITE without sdp may do the same but not actually because, then UAS may send sdp in 200 ok which will force UAC to negotiate. Dont know if the above is a practical scenario. -- With Regards Retesh Chadha _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
