The Usage of H.323 Gateways
A device that is “gateway controlled” will need to successfully query the
gatekeeper in order to gain admission. The CODEC region should be set
to handle the correct CODEC and compression technique. It is allowable
to share H.323 gateways between multiple inbound and outbound calls.
Gateways that are implemented with Skinny Gateway Protocol and
MGCP are only allowed within one Cisco CallManager cluster.