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
Unified Communications Server
Simply explore your Android phone!
A simple noise gate app intended for use with VOIPs like Skype.
A beautiful SMS messenger for Android
Java wrapper for the popular chat & VOIP service
VICIdial Contact Center Suite
The most affordable CRM system according to Capterra
Enterprise telephony recording and retrieval system
Remote control software for applications using Bluetooth or Wi-Fi.
Windows tool to read SIM card information and content
A domain based multi-tenant PBX & voice switch for FreeSWITCH
Plugin for entering and validating international telephone numbers
A Swift framework for parsing and formatting phone numbers
PHP version of Google's phone number handling library