I'm not quite sure what you are asking here - but typically with a CUCM system the two VGs should not communicate directly. You would have dial-peers covering all internal numbers on each, pointing at the CUCM servers, and the CUCM servers would route to the gateways using route patterns.
If a call needs to go from 3925 --> VG204 then it would go:
Thanks you Aaron , but my question is how to setup the 3925 router to be H323 gateway for the CUCM call manager and to be as H323 for VG204 as well , so call from > IP phone --- CUCM --- 3925 ---VG204---analogue phone and vise versa
the VG204 is directly connected to only 3925 router , and the 3925 connected to both CUCM and VG204
If you really want to configure them to send H323 calls direct to between the 3925 adn VG204, then you would configure dial-peers on each with appropriate destination-pattern set, and 'session target ipv4:x.x.x.x' set to the other device.
Bear in mind that if you don't have full IP reachability between the VG204 and all the devices associated with the CUCM that it might call, then you will probably get some problems. If you have full reachability I would configure each device to route calls between only itself and CUCM as suggested above.
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