Hi Ben,
I have some queries in BLUE. -----Original Message----- From: Ben Gatewood [ <mailto:[EMAIL PROTECTED]> mailto:[EMAIL PROTECTED] Sent: Friday, October 28, 2005 5:45 PM To: Naveen Kak (WT01 - Voice & Next Generation Networks); [email protected] Subject: RE: [Sip-implementors] Offer-Answer in SIP Hey Naveen - Responses inline. >Hi all, >As per the RFC, if the "Offer" is send in INVITE, then the "Answer" can >be received in any of the provisional responses( 180,183 ..) or a 200 >OK.So then theoretically, media can start flowing in even if a final >response is not received( if the Answer comes in a provisional >response).Is this behavior correct? Not only correct but required in certain PSTN interworking scenarios. In certain PSTN scenarios, they are required for one way audio ( ring tone to be played Back to the caller). I was thinking more of announcements stating your call had been unsuccessful but.yes. But actually a 2 way audio can be established without a 200 OK coming in picture?Is that right?? Yes but I'm struggling to think of any meaningful media you could send in this direction for this scenario. >Moreover, what if the Answer comes in a provisional response and then >200 OK also returns an Answer. Can both the Answers differ( lets say as >per the proviosnal reponse G.711 is the chosen codec and then 200 OK >returns G.729 as the chosen codec). No. Does that mean if a proviosonal response contains an Answer, either the 200 OK can't send another Answer or the Answer has to be same as in the provisonal reponse??? I should have also specified that the answer has to be in a reliable provisional response. If such an answer is sent then I don't believe you are required to put the answer in the final response again but if you do, it has to be the same. I believe most implementations copy the answer in the final response rather than omitting it. >Thanks >Naveen Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. _______________________________________________ Sip-implementors mailing list [email protected] <http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors> http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
