A service, as defined by the Session Initiation Protocol (SIP) specification, in which a mapping of endpoints is maintained. Each time that a SIP endpoint connects to an Internet Protocol (IP) network, it contacts the configured registrar and provides the necessary mapping information. The registrar extracts information about the endpoint’s location (IP address, port, and user name), and stores the information in a location database. The purpose of the location database is to enable endpoints to connect without having to maintain a separate listing of all other endpoints.
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