[SIPForum-discussion] Busy Lamp Field (BLF) and Presence

[Andro]

Yes Vivek,

Application Server (AS) uses Subscribe/Notify methods to inform the main
unit about the status of monitored lines.
So , the main unit has to subscribe to the service on the AS. Then AS inform
the main unit each time the status of monitored line changes.

Hope it helps,
Andrea

2008/11/28 Vivek Batra <Vivek.Batra at matrixtelesol.com>

>  Hi,
>
> Anyone has idea about the functioning of BLF (Busy Lamp Field) in IP Phone.
> How the central entity (B2BUA) updates the IP Phone about the status (viz
> Ringing, Idle, Busy) of other numbers which IP Phone wants to monitor? Does
> it works using SUBSCRIBE/ NOTIFY mechanism?
>
> Is BLF feature same as of **Presence**?
>
>
>
> Best Regards,
>
> Vivek Batra
>
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