ocr: Voice cal estahlished Session Initiation : Voice call request and response Protocel (SIP) server Internet Caller 11 TI Recpient Figure 2. Session Initiation Protocol (SIP) speeds up call setup by bundling all of the contiguration information in the initial request. The request is either sent directly or via the proxy server to the recipient, who accepts the call and immediately initiates the session.
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