Browse free open source Telephony software and projects below. Use the toggles on the left to filter open source Telephony software by OS, license, language, programming language, and project status.
Issabel PBX - Unified Communications
Simply explore your Android phone!
Unified Communications Server
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
A simple noise gate app intended for use with VOIPs like Skype.
Java wrapper for the popular chat & VOIP service
A beautiful SMS messenger for Android
VICIdial Contact Center Suite
The most affordable CRM system according to Capterra
Remote control software for applications using Bluetooth or Wi-Fi.
Enterprise telephony recording and retrieval system
Windows tool to read SIM card information and content
Browse over Tor/i2p, Anon p2p Chat/FileTx, p2p ConfVideoVoIP
PHP version of Google's phone number handling library