Am 19.04.2006 schrieb Paul Kyzivat <[EMAIL PROTECTED]>: > > > [EMAIL PROTECTED] wrote: >> Am 19.04.2006 schrieb Paul Kyzivat <[EMAIL PROTECTED]>: >> >>> If the provisional containing the answer was unreliable then the answer >>> must also be in the 2xx. If the provisional containing the answer was >>> reliable, then the answer need not be repeated in the 2xx, but it may >>> be. If it is, it should be ignored by the UAC. >> >> >> Hi Paul, >> >> you wrote, that the answer must be in the unreliable provisional and in the >> successful response. Must be the answer identical or could be the answer >> different (for example UAC offers PCMU and PCMA, UAS confirms with >> 1xx PCMU and >> in the 2xx PCMA)? > > The requirement is that they be identical. > > If you want to change, then you need another offer/answer cycle. With > unreliable provisionals you can't do that until the invite is complete. > > Paul >
Hi Paul, now I have a problem in my understanding. A UAC sends out an INVITE with SDP for audio and video to a gateway. The gateway alters the SIP message to an Non-SIP signal. It sends a 183 with a SDP and confirms only audio to start early media. But now the caller accepts audio and video. What should the gateway do? If it does not confirm video, video should be used. If it confirms video, video will maybe not used. Could this scenario happen in pratice? If yes, what is the solution? Could the gateway have information about the endpoint? Regards, Markus _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
