[Serusers] busy indicator

[Tom]

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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