Hangup() — Unconditionally hangs up the current channel
Unconditionally hangs up the current channel. If supported
on the channel, cause-code will be specified
to the remote end as the reason for ending the call.
cause-code defaults to 16 (normal call
clearing). Acceptable values for cause-code
are the following:
Normal call clearing
Busy
No answer
Rejected
Congestion
exten => 123,1,Answer()
exten => 123,2,Playback(im-sorry)
exten => 123,3,Hangup()