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Use Unified Communications Managed API version 1.0 to create endpoints for SIP-based middle tier communications and collaboration applications. A user creates an endpoint to enable communication with other users. UCMA exposes two types of endpoints.
The SipEndpoint is a real-time endpoint that can be used when there is a server available for discovering and communicating with other users.
The SipPeerToPeerEndpoint is a real-time endpoint that can be used when there is no server infrastructure available. This type of endpoint also can be used when a proxy server that does not require registration is available.