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Flexisip

Communication & Email

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.

C++ Latest 2.7.0-alpha · 2mo ago Security brief →

Features

  • SIP Proxy Server for routing SIP messages
  • Push Notification Service to deliver in‑call and message alerts to mobile devices
  • Presence Server for online status and availability tracking
  • Back‑to‑Back User Agent (B2BUA) enabling caller identity translation, media transcoding, and SIP trunking
  • RegEvent Server notifying tier domains of user registrations

Recent releases

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C++ CMake C

Beta — feedback welcome: [email protected]