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
A simple noise gate app intended for use with VOIPs like Skype.
Unified Communications Server
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
VICIdial Contact Center Suite
Java wrapper for the popular chat & VOIP service
Windows tool to read SIM card information and content
Cellular manager for mobile phones/modems
Sim Card explorer and decoder
The most affordable CRM system according to Capterra
Open-source event-driven AI powered Softphone
Java VoIP Softphone (SIP) (replaced by jfPhone)
PHP version of Google's phone number handling library
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Provide softphone support to AmazonConnect customers