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Understanding the SIP architecture | Building Telephony Systems with OpenSIPS - Second Edition
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A General Purpose Connection CTI Server Based on the SIP Protocol and Its Implementation - Watanabe - 2014 - Electronics and Communications in Japan - Wiley Online Library
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What is SIP Client?
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What Is a SIP Proxy? How Does a SIP Server Work?
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Direct calls between two SIP phones without passing through a SIP proxy
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What is SIP Server?
