On Wed, Jun 30, 2010 at 4:38 AM, afshin afzali <a.afzali2003@gmail.com> wrote:
If your phone supports SIP update message, the actual caller-id will
be updated when the agent respond to call.

This is correct. Just two points to add:

#1 - FIFO is not ACD. The call isn't transferred to the agent's phone until *after* the agent picks up, therefore there is no way to send the caller ID prior to the agent picking up

#2 - Some soft phones (*cough*x-lite*cough*) do not support the display update, so be warned...

-MC