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PJSIP is a free and open source multimedia communication library written in C with high level API in C, C++, Java, C#, and Python languages. It implements standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines signaling protocol (SIP) with rich multimedia framework and NAT traversal functionality into high level API that is portable and suitable for almost any type of systems ranging from desktops, embedded systems, to mobile handsets.

• Main repository: https://github.com/pjsip/pjproject
• Releases: https://github.com/pjsip/pjproject/releases

Main documentation site: https://docs.pjsip.org

Table of contents:

• Overview
  • Overview
  • Features (Datasheet)
  • License
• Getting started
  • Getting PJSIP
  • General Guidelines
  • Android
  • iPhone
  • Mac/Linux/Unix
  • Windows
  • Windows Phone
• PJSUA2 - High level API guide
  • Introduction
  • Building PJSUA2
  • General concepts
  • Hello world!
  • Using PJSUA2
  • Sample applications
• Specific guides
  • Audio
  • Audio Troubleshooting
  • Build and integration
  • Development and programming
  • Media
  • Network and NAT
  • Performance and footprint
  • Security
  • SIP
  • Video
  • Other
• API reference
  • PJSUA2 - high level API (Java/C#/Python/C++/swig)
  • PJSUA-LIB - high level API (C)
  • PJSIP - SIP stack
  • PJMEDIA - media framework
  • PJNATH - NAT traversal helper
  • PJLIB-UTIL - utilities
  • PJLIB - portable library