i would like to know if it's possible to specify which send to vru label icm to send,
Before there was SIP, there was H.323. The branch-office problem was solved there too.
Cisco have the same setup in H.323, but you are looking for a different setting.
The configuration item is in the CVP VB and you should configure "SetTransferLabel" to the VRU transfer label. To prevent CUCM originated calls being sent back to a Subscriber, and the IP addresses as a comma-separated list to "SetExcludeIP"
Search the manual for the two terms above.
(When asking a CVP question, stating SIP or H.323 is always advisable)