# pjsip/pjproject

PJSIP project

Repository: https://github.com/pjsip/pjproject
Canonical: https://ross.abutalabs.com/products/pjproject
Homepage: http://www.pjsip.org
Language: C
License: GPL-2.0
License Family: copyleft
Topics: pjsip, sip, rtp, nat-traversal, voip, android, ios, android-ndk
Last push: 2026-08-26T05:40:14+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 56, longevity 100
- inputs: {"age_days": 3874, "days_push": 7, "days_rel": 133, "gap_med": 147, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2677, forks 1006 (observed 2026-08-28T04:07:09.792818+00:00)

## What it is
PJSIP is an open-source multimedia communication library written in C that implements SIP, SDP, RTP, STUN, TURN, and ICE protocols with high-level APIs in C, C++, Java, C#, and Python. It combines SIP signaling, audio/video media, and NAT traversal into a compact, portable API suitable for desktops, embedded systems, and mobile handsets.

## Use cases
- build a SIP softphone for iOS and Android
- add VoIP calling with audio and video to an application
- implement SIP signaling with NAT traversal via STUN, TURN, and ICE
- embed real-time multimedia communication in an embedded or RTOS device
- create a SIP client with presence and instant messaging
- make peer-to-peer calls across NATs using ICE

## When to choose
- you need a mature, standards-compliant SIP/RTP stack with NAT traversal in one library
- you are building a cross-platform VoIP or video-calling app including mobile
- you need a small-footprint library that runs on embedded systems
- you want high-level APIs in multiple languages over a C core

## When to avoid
- you need WebRTC browser interoperability out of the box without extra work
- your project requires a permissive license since PJSIP is GPL-2.0 (commercial license available separately)
- you only need simple HTTP or messaging rather than real-time multimedia sessions
- you prefer a managed-language-only solution without native C compilation

## Facets
- artifact type: library
- maturity: stable
- function: http-client, audio-processing, video-processing, networking, sdk
- domain: networking, cross-platform, developer-tools
- platform: windows, cross-platform, embedded, cpp, c
- tags: sip, voip, rtp, nat-traversal, stun, turn, ice, multimedia-communication, softphone, real-time, linux, macos, android, ios

## Member repositories
- pjsip/pjproject (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:09.792818+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:18:00.731546+00:00, confidence not recorded.
  - readme: https://github.com/pjsip/pjproject (fetched 2026-08-28T04:07:09.792818+00:00, sha 7a1b730db109)
  - homepage: http://www.pjsip.org (fetched 2026-08-29T10:01:31.489799+00:00, sha 6d6200079588)
  - site_page: https://www.pjsip.org/about.htm (fetched 2026-08-29T10:01:31.500296+00:00, sha 5499c853e5b7)
- Data as of 2026-08-30T08:39:29.467469+00:00.