SIP

👥kind protocolusage messagingenc optionaltopology federatedentity federatedid account

started: 1996
by: Henning Schulzrinne, Mark Handley, Eve Schooler, Jonathan Rosenberg
homepage: https://www.rfc-editor.org/rfc/rfc3261
wikipedia: https://en.wikipedia.org/wiki/Session_Initiation_Protocol

Session Initiation Protocol — the IETF standard for federated voice, video, and messaging session setup. Underpins most interoperable VoIP between independent providers.

Has inspired

IAX2

Used by

Asterisk
FreeSWITCH
Kamailio
OpenSIPS