Echo() — Echoes inbound audio back to the caller
Echoes audio read from the channel back to the channel. This
application is often used to test the latency and voice quality of a
VoIP link. The caller may press the
# key to exit.
0 if the user exits
# key, or
-1 if the user hangs up.
exten => 123,1,Echo() exten => 123,2,Playback(vm-goodbye)