Hello, I have checked the RFC 4235 about the Dialog Event package and there is something that I don't understand.
The paper claims that a subscription MUST contain the next parameters: call-id, to-tag, from-tag. Let's imagine the case for Automatic Callback. User A calls user B but he is busy. When user B hangs up, user A is alerted. What I don't understand here is how A can send a SUBSCRIBE which contains the call-id, to-tag and from-tag of B's dialog with another user in order to be alerted to the end of that conversation. How can A be aware of this information? Thanks _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
