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Requirements Req 1: When one user has multiple SIP UAs which share the same AOR, he can provide a name for each such UA to further classify and manipulate the communication services for them. Req 2: The extension name is allocated by the user and is valid within the namespace of his AOR. It is recommended to be human- readable. Req 3: One AOR may have multiple extension names under it, and each extension name may have one or more UAs associated. Req 4: The other user can make call to the associated UA(s) by specify the destination AOR and extension name together. Req 5: if the user just provide the extension name when making the call, it mean he is to dial the other UAs under the same AOR. And the system should treat the call as if he provide the AOR and extension name together. |