[Asterisk-Users] DID Routing over SIP

[Asterisk VoIP]

Hi- 

Does any one know how to route DIDs over SIP from one Asterisk box to
other SIP gateway. I have no Zap channel or PRI on my asterisk box. I
got 10 DIDs from one VoIP provider and would like to pass (
route/forward) 2 each to my friends SIP gateway ( Asterisk/Cisco
Express call manager).

I am new to Asterisk. I would really appreciate if some one help me to
get this through.

Thanks, 
Mike.