> Try this experiment: Fire up your Gizmo account, and have the > registered UA return a 302 to a Contact of > sip:[EMAIL PROTECTED] > " > . > > Now call "sip:[EMAIL PROTECTED]" (or whatever your Gizmo ID > is) from a phone that doesn't have Gizmo credentials and see if they > let you make a free phone call to the PSTN. Hint: They don't.
Yeah, sure, they are not there to lose money. For the type of feature you are looking at, I think a Tel URI makes more sense. I'm just pointing out with the current state of SIP phones, it probably won't work. > You make a mistake in assuming that a phone number means that Alice > has to figure out how to get to the PSTN. She doesn't -- she needs to > figure out how to get to the target specified by the phone number, > which might or might not be on the Internet as well as the PSTN. > further, she needs to figure out the "best" (and that's a local policy > question) to get there, and answering this question might involve > choosing between multiple gateways and connecting directly over the > Internet. It might even require something as complex as starting up a > VPN in order to get a connection to a corporate gateway. > > There is no way that the domain of the target can make this decision > for her, unless the domain of the target is picking up the cost (the > PSTN gateway charge) for doing so, in which a proxy-retargeting > operation is arguably a better approach than a 302 response. Again, let's recommend the Tel URI approach then. _______________________________________________ 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
