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Requirements Analysis A SIP Forking Proxy and Registrar/Location Service meets REQ-1. The SIP Dialog Package meets REQ-2. The SIP Replaces and Join header fields meets REQ-3. The SIP Registration Package meets REQ-4. The use of a State Agent for the Dialog Package meets REQ-5. REQ-6 suggests an “Appearance Agent” REQs 7-13 require some SIP extensions or conventions |