Browse free open source Telephony software and projects for Windows 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!
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
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
The most affordable CRM system according to Capterra
Windows tool to read SIM card information and content
Enterprise telephony recording and retrieval system
Sim Card explorer and decoder
Cellular manager for mobile phones/modems
Plugin for entering and validating international telephone numbers