> -----Original Message----- > From: Dean Willis [mailto:[EMAIL PROTECTED] > > Proxies that recurse on 302 responses should be taken out and burned > anyhow. It's just a tragically stupid thing to do in most cases. In > the scenarios we're talking about, which probably involve a transition > from a "no charge" IP call to a potentially very expensive (like, up > to $25 a minute for some premium services) PSTN call, the user REALLY > needs to be able to make a decision.
I think that's a great utopian view, but in the real world that would be impractical. A great many SIP UA's are ultimately just TDM gateways, providing POTS-type interfaces into the home, or PBX phone lines into the office, etc. Afaik there is no way for them to indicate this redirection to the human, or have a way to be told yes/no by the human. Some people handle this type of thing with an app-server b2bua where it plays out a message and takes in DTMF to make the decision, but I think that's uncommon. I think/hope in the common case, if a call goes from one provider to another, the second provider will not recurse it outside of its domain and will pass it back upstream to the calling provider to decide. I think that because often the billing model between them seems to dictate that. I have no doubt some cases will occur to validate your concern, but I think market forces will "correct" them naturally over time. Providers have plenty of natural motivation not to piss off their customers and regulators. -hadriel _______________________________________________ Sip mailing list https://www.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
