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
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
A simple noise gate app intended for use with VOIPs like Skype.
Unified Communications Server
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
VICIdial Contact Center Suite
Remote control software for applications using wi-fi or bluetooth
A domain based multi-tenant PBX & voice switch for FreeSWITCH
Windows tool to read SIM card information and content
A beautiful SMS messenger for Android
Cellular manager for mobile phones/modems
The most affordable CRM system according to Capterra
Java wrapper for the popular chat & VOIP service
Sim Card explorer and decoder