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
A simple noise gate app intended for use with VOIPs like Skype.
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Unified Communications Server
A beautiful SMS messenger for Android
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
VICIdial Contact Center Suite
Windows tool to read SIM card information and content
Open-source event-driven AI powered Softphone
A domain based multi-tenant PBX & voice switch for FreeSWITCH
Cellular manager for mobile phones/modems
Plugin for entering and validating international telephone numbers
Remote control software for applications using wi-fi or bluetooth
PHP version of Google's phone number handling library