At other times, I??™m on the road and need that call
to go to my cell phone, but I don??™t want to have to go into the offi ce to make that change.
By using a presence engine, we can control this call fl ow in a number of ways. First, we can
implement and control basic call forwarding from a GUI console. In the case of Microsoft
Offi ce Communicator (MOC), this can be done on a PC or a Windows Smartphone, further
extending your control of your presence??”but we??™ll get to that a little later. A true presence
engine must be able to take this a step further, or we??™re simply duplicating call control from
a PBX. A presence engine has to be able to determine what to do with a call without you
manually adjusting the call fl ow. For example, most of us keep our cell phones somewhere on
our person, correct? Well, let??™s say you??™ve put in a few hours of hard work in front of your PC,
and you decide to take a walk to the lunch room for a cup of coffee; the president of your
company is also in there and decides to spark up a conversation that goes for 20 minutes. You
know you have an important call coming into your desk phone shortly, but you don??™t want to
12 Chapter 1 ??? Unifi ed Communications
be rude. How great would it be if your PC could recognize the fact that you??™re away from
your desk, intercept the call to your desk phone, and forward it to your cell phone?
This concept loops back around to the fundamental concept of presence. In this scenario,
the person who is calling you doesn??™t want to have to worry about calling your desk, leaving
a message, and then calling your cell phone.
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