ChanIsAvail() — Finds out if a specified channel is currently available
Checks to see if any of the requested channels are available. This application also sets the following channel variables:
AVAILCHAN
The name of the available channel, including the call session number used to perform the test
AVAILORIGCHAN
The canonical channel name that was used to create the channel—that is, the channel name without any session number
AVAILSTATUS
The status code for the channel
If the option s (which stands
for “state”) is specified, Asterisk will consider the channel
unavailable whenever it is in use, even if it can take another
call.
If the j option is specified,
and none of the requested channels are available, the new priority will
be n+101n is the current priority), if that priority
exists.
; check both Zap/1 and Zap/2 to see if they're available
exten => 123,1,ChanIsAvail(Zap/1&Zap/2)
; print the available channel name to the Asterisk CLI
exten => 123,2,Verbose(0,${AVAILORIGCHAN})This application does not work correctly on MGCP channels.