Touchdown - sync Global Address List?

[NorthVandea]

I'll start with the situation. I am required to use Touchdown email on my Galaxy Nexus for work. I cannot use the stock corporate email app for device management reasons. I am on call frequently, so I need to answer calls on my cell phone. When users call in from work their 4 digit extension comes up on my cell phone's caller ID. I would like to configure Touchdown to sync my corporate GAL so that the end result is when users call from their extension my phone pulls their name from the GAL as I do not have every extension memorized, just most of them

Does anyone know if it is possible to do this based on my long-winded explanation? I would be willing to install additional apps if need be, but I cannot root my device.

Any assistance/or ideas would be greatly appreciated!