CUMA doesn't do anything from a wireless to cellular roaming perspective. It's predominantly a mobile presence client for Blackberry devices and now iPhone as well. It might be a part of your overall mobility solution but not what you need for this requirement. Take a look here here to get you started:
www.cisco.com/en/US/solutions/.../at_a_glance_c45-472910.pdf
I've never used this product so I can't give any details on how it performs or what all the requirements are but its called the Cisco Mobile Intelligent Routing Solution.
Hailey
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