Hi Aaron,
I don't believe that CCM has native support for what you are trying to accomplish. There is a Cisco product called Mobility Manager that does exactly this however;
Cisco Unified MobilityManager
http://www.cisco.com/en/US/products/ps6567/index.html
Here is an excerpt;
The Cisco Mobile Connect service, commonly known as Single Number Reach (SNR), is a software application that resides on the Cisco Unified MobilityManager Server. Cisco Mobile Connect gives users the ability to redirect incoming IP calls to up to four different designated client devices routing calls from the enterprise IP PBX to existing cellular phones or IP phones.
Hope this helps!
Rob