I'm trying to understand how this call scenario is implemented in WebRTC / libJingle:
Caller A want to call callee B but B is not online so server redirects A to a voice mail.
After A send connection requests to server, and XMPP server don't have B in the presence list, what happens? How the server redirects the caller to a voicemail instead of continue with the regular call flow? What messages are returned to A? ...