Gatekeeper Transaction Message Protocol (GKTMP) is a protocol that is used between the Cisco IOS Gatekeeper and a server to provide enhanced call routing and address translation services.
The Cisco gatekeepers use different signaling methods to render redundancy, control capability and extensibility of H.323 network, important one among them being the Gatekeeper Transaction Message Protocol (GKTMP). Gatekeepers are H.323 devices that provide services such as bandwidth management, admission control, address translation, etc., to facilitate the network scalability. These services are provided for H.323 terminals and multipoint control unit. Such gatekeeper features are generally supported on the Cisco 2600, 3600, 2800, 3800 and 7200 family. Gatekeepers improve scalability and management. They use the RAS protocol to communicate with Cisco voice gateway. The GKTMP Interface Resiliency Enhancement feature incorporates additional parameters such as call duration, start time and reason for field connection in Request DRQ messages which are sent from gatekeeper to the server. These messages are then used by the server for billing and accounting functions. They allow the gatekeeper to identify unavailable servers and to route them to alternate servers.
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