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
Java wrapper for the popular chat & VOIP service
Matrix reference homeserver
VICIdial Contact Center Suite
Remote control software for applications using wi-fi or bluetooth
The most affordable CRM system according to Capterra
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
PHP version of Google's phone number handling library
Cellular manager for mobile phones/modems
Plugin for entering and validating international telephone numbers
A beautiful SMS messenger for Android
A domain based multi-tenant PBX & voice switch for FreeSWITCH