CHANNEL STATUS [channelname]
Queries the status of the channel indicated by
channelname or, if no channel is specified, the
current channel.
Return values:
0
-
Channel is down and available
1
-
Channel is down, but reserved
2
-
Channel is off-hook
3
-
Digits have been dialed
4
-
Line is ringing
5
-
Line is up
6
-
Line is busy
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