PJSIP is a free, open-source multimedia communication library written in C that is used for troubleshooting VoIP. PJSIP implements standard-based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE, targeting VoIP (Voice over IP) applications, including SIP signaling and media handling. You will find the project at github here.
What Is the PJSIP Tool?
When people refer to the “PJSIP tool,” they usually mean:
- PJSUA (PJSIP User Agent) — a command-line SIP softphone provided as part of the PJSIP suite.
- The PJSIP library, which developers use to build SIP/VoIP applications.
- PJSIP modules in Asterisk, where it has replaced the older chan_sip module.
Key Features of the PJSIP Toolset
| Feature | Description |
|---|---|
| SIP signaling | Support for SIP methods: INVITE, REGISTER, OPTIONS, etc. |
| RTP media | Audio streaming with support for codecs like G.711, G.729, Opus, etc. |
| NAT traversal | STUN, TURN, and ICE support for NAT/firewall-friendly VoIP |
| Command-line client (pjsua) | Test SIP servers, register accounts, place/receive calls |
| Portability | Runs on Linux, macOS, Windows, Android, and iOS |
Example Usage of pjsua Tool
Register with a SIP server:
bashpjsua --id sip:1000@domain.com --registrar sip:domain.com --realm * --username 1000 --password mypassword
Send a SIP OPTIONS ping:
bashpjsua --null-audio --id sip:tester@domain.com --registrar sip:domain.com --username tester --password secret \
--send-options sip:server@domain.com
Place a call:
bashpjsua --id sip:1000@domain.com --registrar sip:domain.com --username 1000 --password secret sip:2000@domain.com
Installation
Strongly recommend that you visit their site documents for installation and usage documentation here. Windows users here.
- Ubuntu/Debian:
sudo apt install libpjsua2-dev - Or compile from source:
git clone https://github.com/pjsip/pjproject.git cd pjproject ./configure && make dep && make
Use Cases
- VoIP testing and monitoring
- SIP endpoint emulation
- Developing softphones and SIP-enabled apps
- Load or function testing in SIP infrastructures
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