Hello all. Has anyone had any success using ChanIsAvail with only SIP channels? Is there another, better way to check if an extension is busy without dialing it?
Well, SIP devices live their own life and should really handle this signalling themselves. That's why ChanIsAvail does not really work with SIP channels, Asterisk does not control what is happening out there in the wild. The SIP channel is really a compromise from a business PBX point of view, where you want to know what is happening out there, which lines are occupied etc etc.
I think that you can use incominglimit and outgoinglimit to limit the number of calls asterisk place to a SIP device and force busy if there's already a call going on.
Remember that this limits the number of connections to/from Asterisk, not necessarily the number of calls on the SIP device.
/O
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