[asterisk-users] Detecting open SIP channels in the dial plan

[Voip Asterisk]

Is is possible to detect open SIP channels in the dial plan and use that
detection to perform logic?

For instance, say you have a multi line device such as a poly 301, depending
on the path of the incoming call you want to be able to route the call to
the phone if 1 line is already in use or send it elsewhere.

More specifically if the phone is part of a hunt group it would not right if
someone was on it, but if someone called the phone directly it would ring.

Thanks

Miles
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