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What is the difference between gateway and gatekeeper?

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QUESTION POSED ON: 09 February 2004
What is the difference between gateway and gatekeeper? Is it possible to use a Cisco 2600 router as a gateway and if it is -- then do I need a separate SIP proxy server again for Authenticating IP phones. Can it be used to communicate between IP phones and to the telco's PSTN network?

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A gateway in this context is a device capable of converting between interface types. One type of gateway is a SIP to PSTN gateway. A gateway does not handle registration and authentication of devices. The Cisco 2600 can be configured as a SIP to PSTN gateway. Gatekeeper is a term used in H.323 networks. A Gatekeeper handles the registration and authentication of devices. The Cisco SIP Proxy would perform this function in a SIP network. The SIP Proxy directs calls between endpoints and gateways.

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