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What is Session Initiation Protocol (SIP) and can SIP packets be NATted?

April 26, 2017initiation natted packets Protocol session SIP

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What is Session Initiation Protocol (SIP) and can SIP packets be NATted?

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A. Session Initiation Protocol (SIP) is an ASCII-based, application-layer control protocol that can be used to establish, maintain, and terminate calls between two or more endpoints. SIP is an alternative protocol developed by the Internet Engineering Task Force (IETF) for multimedia conferencing over IP. The Cisco SIP implementation enables supported Cisco platforms to signal the setup of voice and multimedia calls over IP networks. Refer to Overview of SIP for more information. SIP packets can be NATted. Refer to NAT Support for SIP and NAT Support of H.323 v2 RAS for more information.