Core Issue
When the gateways are added, it is shown as UNKNOWN in the status field in the Cisco CallManager Find and List Gateways page. However, the calls are routed across the gateways properly.
Resolution
This is normal behavior when the gateway is an H.323 gateway as it is a peer-to-peer relationship. However, for an Media Gateway Control Protocol (MGCP) gateway, it needs to be registered with the Cisco CallManager as it is a master/slave setup.