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Training Camp • Cybersecurity Glossary
A signaling protocol (RFC 3261) for initiating, maintaining, and terminating real-time multimedia sessions such as VoIP voice, video, and messaging.
Session Initiation Protocol (SIP) Definition: A signaling protocol (RFC 3261) for initiating, maintaining, and terminating real-time multimedia sessions such as VoIP voice, video, and messaging.
Designed to manage multimedia connections. SIP is a signaling protocol used for initiating, maintaining, and terminating real-time communication sessions involving voice, video, messaging, and other multimedia elements. It handles session establishment, modification, and termination in IP-based networks, working with other protocols like RTP for media transport. SIP specifications are defined in RFC 3261 and related RFCs, with security considerations in RFC 3261 and subsequent extensions. Organizations secure SIP through encryption (TLS, SRTP), authentication mechanisms, topology hiding, session border controllers, and monitoring for VoIP-specific threats. For example, an enterprise might implement a secure VoIP infrastructure using SIP over TLS for signaling encryption, SRTP for media encryption, SIP authentication requirements, session border controllers at network boundaries, and specialized VoIP security monitoring to protect against threats like toll fraud and call hijacking. Related terms: VoIP, Unified Communications, RTP, SDP, SIP trunk, Voice security, Media gateway, Call control, Session border controller.
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