Richard,
As has been said before, in the world of SIP, you should just let the phone take care of it. The phone might have a zillion call appearances, and only return a true busy if they are all in use.
On a tradional key phone system, the person doing the transfer might have a key that shows if the destination phone is in use or not. It is a little unscalable, if you have a lot of phones. So generally, in PBX systems you would try the transfer and see if you get a busy.
There really isn't an IP equivelent of a key phone system. If you use Asterisk, there is an operator web page display avaiable, which shows the status of each phone. Asterisk acts like a B2BUA, and sits in the middle of all SIP calls, and can track call state.
Tom
On Tue, 4 May 2004, Richard wrote:
Hi,
In traditional PBX, there is a feature to indicate if another user (more precisely his phone) is being used or not. This would help before transfering a call.
Is there a way to support this in ser? If record-route is used, ser knows that users are on the phone bewteen ACK and BYE methods. Is possible somehow tell other phones about the status?
Thanks, Richard
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