Browse free open source Telephony software and projects for Linux 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 domain based multi-tenant PBX & voice switch for FreeSWITCH
VICIdial Contact Center Suite
Open-source event-driven AI powered Softphone
Cellular manager for mobile phones/modems
Java wrapper for the popular chat & VOIP service
Remote control software for applications using wi-fi or bluetooth
PHP version of Google's phone number handling library
Sim Card explorer and decoder
An open source 3GPP LTE implementation.