VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source Fax server software for inbound / outbound internet Faxing
Project about FusionPBX on Live Medium
Callflow Sequence Diagram Generator
An administration web interface for Mumble VoIP servers in PHP
A simple noise gate app intended for use with VOIPs like Skype.
Cyber-wrt pbx is embedded system in DD-Wrt router
Baresip is a modular SIP User-Agent with audio and video support
A suite of open-source tools and frameworks for creating SIP apps
C++ SIP stack based on Chrome source code