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Session Initiation Protocol

Internet protocol
The Session Initiation Protocol is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. SIP is used in Internet telephony, in private IP telephone... Wikipedia
Abbreviation: SIP
Introduction: March 1999; 25 years ago
OSI layer: Application layer (Layer 7)
Port(s): 5060, 5061
Purpose: Internet telephony
RFC(s): 2543, 3261