On Apr 11, 2008, at 8:39 AM, Juha Heinanen wrote: > Paul Kyzivat writes: > >> (Except of course that may introduce interop problems with devices >> that >> don't support tel. But those will be fixed by SBCs :-) > > i think it is mandatory for sip phones to support tel. otherwise it > is > impossible to for a sip phone in another domain to 302 caller to a > pstn > number. >
I too think tel: support is critical. To refine the above, without tel: it is generally impossible to 302 a caller to a PSTN node without also specifying a route for reaching that node. If one were to redirect to sip:[EMAIL PROTECTED];user=phone, one might still reach the correct telephone, but one would be constrained to do so by using the resources at the specified domain, which might or might not present an authorization problem. The only way we have to redirect a caller to a PST node that is to be reached by the caller's best available means is to use a tel: URI. -- Dean _______________________________________________ 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
