August 2007
Intermediate to advanced
608 pages
20h 33m
English
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Name
ChanIsAvail() — Finds out if a specified channel is currently available
Synopsis
ChanIsAvail(technology1/resource1[&technology2/resource2...][,option])
Checks to see if any of the requested channels are available. This application also sets the following channel variables:
AVAILCHANThe name of the available channel, including the call session number used to perform the test
AVAILORIGCHANThe canonical channel name that was used to create the channel—that is, the channel name without any session number
AVAILSTATUSThe 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})Warning
This application does not work correctly on MGCP channels.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.