[asterisk-users] how to check the status of a channel

[Alexander Lopez]

> > This might be what you're seeking;
> >
http://www.voip-info.org/wiki/index.php?page=Asterisk+cmd+ChanIsAvail
> 
> If the phone rings, then the channel IS available.  The solution is to
> disable call waiting on the SIP device.

The s option needs to be used:
s - Consider the channel unavailable if the channel is in use at all