Hello, just as a short note: to my knowledge their are allready SIP VoIP providers out there which bill their customers beginning from the 180 (even if their is no early media but just a local ring back tone). And the only reason for doing it is that the old POTS telcos in their countries do it the same way. Sad but true.
Regards Nils Ohlmeier On Thursday 26 August 2004 09:26, Gilles Compienne wrote: > 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 _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
