[cisco-voip] best way to route call between 2 CUCMs

[Michael Hamann]

Hello,

we support a company with severel sub organisations. We have a large 
CUCM cluster (Ver 9.1), which provided telephony for most of the users. 
Now one unit is building up a seperate smal CUCM (Ver 10.x). Both units 
networks are seperated through a firewall, no overlapping subnets. The 
firewall is supported by us, so we could add additional firewall rules..

Call between these units should be routed via IP and not via a 
back-to-back ISDN gateway. What would be the best and easiest way to 
configure this ?

- SIP trunk between the two CUCM with "media termination point required" 
set to true ?
- H323 Intercluster trunk ?

or do we need an ISR with cube to do this ?

thank you for your advice...

kind regards
Michael
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