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 The Cisco Meeting Server (CMS) supports H.323-to-SIP interworking, which means it can receive and send H.323 calls and convert them to SIP calls. The CMS does not support H.323 registration or call control, as it is a SIP-based solution. The CMS uses the Cisco Expressway as the edge device to handle H.323 calls from external networks. The CMS also has an optional H.323 gateway component that can be enabled on the same server or on a separate server, but this component is not supported from version 3.0 of the CMS software and has been removed. The H.323 gateway component allows the CMS to receive H.323 calls directly without the need for a gatekeeper or a Cisco Expressway. However, the H.323 gateway component does not provide call control or routing functionality, and it is recommended to use a gatekeeper or a Cisco Expressway for those purposes. References: Cisco Meeting Server 3.1, Single Combined Server Deployment Guide, Should I continue to deploy the H.323 component of Cisco Meeting Server …, Cisco Meeting Server: Enabling H.323 Calls - Fatih Erikci