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
Simply explore your Android phone!
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Unified Communications Server
A simple noise gate app intended for use with VOIPs like Skype.
VICIdial Contact Center Suite
Java wrapper for the popular chat & VOIP service
Remote control software for applications using wi-fi or bluetooth
A domain based multi-tenant PBX & voice switch for FreeSWITCH
The most affordable CRM system according to Capterra
An open source 3GPP LTE implementation.
Windows tool to read SIM card information and content
AT commands as input are sent to modem and responses given as output.
PHP version of Google's phone number handling library