Session Initiation Protocol (SIP) is a signalling protocol used for initiating, maintaining, and terminating real-time voice, video, and messaging sessions over IP networks. It is the foundation of most modern VoIP systems.
SIP handles call setup (INVITE), modification (re-INVITE), and teardown (BYE). It works with codecs for audio compression and RTP for media transport. SIP is used by PBX systems, softphones, and cloud telephony providers.
InboxCentral's voice integrations use SIP for call routing through telephony partners, supporting features like IVR, call recording, and real-time analytics.
Related InboxCentral feature
Voice & IVRAn automated phone system that routes callers using voice or keypad input.
The traditional circuit-switched telephone network.
A service that connects a business phone system to the PSTN via the internet.
A browser technology enabling real-time voice and video without plugins.