Audible intercept is provided when:
The registration was rejected by the home server.
The telephone where the registration attempt is made is not administered for EMU use.
The 15 second timer expires at the visited server.
If the home server receives a request from a visited server for a telephone that already has an EMU visitor registration active, the old registration is terminated and the new registration is approved. If the primary telephone is in-use when a registration attempt is made, the registration attempt fails.