The AS can play media straightway only if it is in the media path and it supports the negotiated codec. In other case, AS needs to change the media path/capabilities. One of the ways to do that is use UPDATE method, though this would work only if the UA supports UPDATE.
regards -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, October 18, 2007 3:42 PM To: [email protected] Subject: [Sip] Playing media message on unanswered call Hello all, I am thinking about one problem, consider following message flow: 1. UE A sends SIP INVITE message with SDP offer to EU B 2. On originating call leg there is application server announced about the call. 3. 180 Ringing message with SDP answer is sent from UE B to UE A (AS is announced that the call is in progress) 4. Time frame allocated to establish the call passed at AS and the message needs to be played ... Can now the AS make use of negotiated media paths and play some "called party not available" message without sending 200 OK message first? My assumption here is that media paths are negoiated (UE A claims sendrecv audio channel so it must be prepare to receive media) so AS "can" send this message. Consider also little complication, AS is not able to play media in a codec claimed in the answer. Can AS send another 180 ringing message where the appropriate codec will be issued? I will appreciate any clarification on this issues. br, Martin _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ---------------------------------------------------------------------------------- IMPORTANT The information contained in this e-mail and any attachments is intended only for the named recipient and may be privileged or confidential. If you are not the intended recipient, please notify us immediately on +44 (0)1908 425000 and do not disclose, copy, distribute or take any action based on the contents of this e-mail. You should understand and accept that, when communicating with us by e-mail, it is not a totally secure communication medium. We accept no liability for any direct, indirect or consequential loss arising from any action taken in reliance on the information contained in this e-mail and give no warranty or representation as to its accuracy or reliability. DIGITALK has the facility to monitor and read both incoming and outgoing communications by e-mail. In line with industry efforts to reduce the proliferation of un-solicited SPAM, DIGITALK uses methods and ban-lists to prevent malicious content reaching our users. This message and any attachments has been scanned for known viruses. However, we would advise you to ensure the content is indeed virus free. We do not, to the extent permitted by law, accept any liability (whether in contract, negligence or otherwise) for any virus infection and/or external compromise of security and/or breach of confidentiality in relation to transmissions sent by e-mail. VAT No: GB 876 3287 81. Reg No: 3080801 Place of Registration: England Registered Office Address: 2 Radian Court, Knowlhill, Milton Keynes ----------------------------------------------------------------------------------" _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
