Returns the status of the specified channel.
If no channel name is given the returns the status of the current channel.
Returns:
failure: 200 result=-1
success: 200 result=<status>
<status> values:
0 Channel is down and available
1 Channel is down, but reserved
2 Channel is off hook
3 Digits (or equivalent) have been dialed
4 Line is ringing
5 Remote end is ringing
6 Line is up
7 Line is busy
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