Hello! Hum... I have to admit this makes me feel uneasy: My understanding of the "philosophy" endorsed by SIP is that your bill should start ticking only when the other end has accepted the call. Now if we say: "oh it would be nice to send some audio/(video?) stream along with the ring signaling message (180) then it means that we are starting to use a service before it has been fully agreed.
If everyone was to do this, then it would probably amount to a non-negligeable percentage of bandwitdh so I could then see the carriers asking themselves perhaps we should then start to bill from the moment the invite goes rather than waiting for the 200)... And me, as an end user, I would be seriously unhappy of that (to the point of probably changing provider! So the carrier to avoid this will quite possibly forbid you to do this)... Also, hearing an unexpected kind of ring tone could be disturbing for the end-user (that reminds me of something I read about initial issue with phone internationalisation where people were disturbed by the differences between countries in the way to render the "busy", "ringing" tones). This is not similar to the situation where you change your own phone ringtone (because then you know what to expect... And some phones will possibly offer the ability to change the ringback tone but then again it is the user's choice...). Regards, Gilles. -----Original Message----- From: Andreas Bystr�m [mailto:[EMAIL PROTECTED] Sent: 26 August 2004 06:27 To: 'Sip-Implementors (E-mail)' Subject: [Sip-implementors] Playing ringback tone to the caller Any suggestions of how to solve personal ringback tone? I want to be able to play media to the caller instead of having the caller generate its own ringback tone. If I have a media server that can play music, and is triggered by the application server, is the simplest (and most "correct") way just to start send to the ip stated in the INVITE? What happens if there are forking, I guess the risk is that it can be several streams sent to the caller? If the offered codecs from the caller cant match the codecs in the invite, is there a way to negotiate this without sending 200 OK? I have tried to find some call flows describing this case, but hae failed. Does anyone know of where I can find call flows describing personal ringback tone? Regards, Andreas _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors This message has been scanned for viruses by MailControl - www.mailcontrol.com _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
