VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial Contact Center Suite
Free, native Windows SIP softphone with HD audio, SRTP encryption
Unified Communications System - PBX System
An open source 3GPP LTE implementation.
Enterprise telephony recording and retrieval system
ERP, IP PBX, Accounting, CRM, Time tracking, and etc.
SIP Video Multiconference Media Server with WebRTC support.
Simple Fone Recorder
Voicent Call Center Manager statistics recording gui