asterisk users - Oct 2007 - Send only Redirect or FWD calls out on specific channel

Does anyone know how I can send only calls that have been forwarded or 
redirected out on a specific channel? 

My PRI provider (BellSouth/AT&T) does not let me set the outgoing caller 
ID to anything other than our DID numbers, so when a user FWD's his 
Polycom phone to his mobile, it looks like his desk is calling his 
mobile phone rather than the Caller ID of the actual caller.  I am 
trying to send these calls out over a Voice Pulse connect so that we can 
set the Caller ID to the original callers information.

Thanks for any help.

Lenny Sawyer

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