A domain based multi-tenant PBX & voice switch for FreeSWITCH
Issabel PBX - Unified Communications
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial Contact Center Suite
Remote control software for applications using wi-fi or bluetooth
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
VoIP/SIP SoftPhone (formerly known as jphonelite)
Web based system for Computer Assisted Telephone Interviewing (CATI)
Simple application to capture and report on Mitel SMD data
Software per Call Center
Unified Communications Server
A beautiful SMS messenger for Android
An open source 3GPP LTE implementation.
open5g is an open source implementation of the 3GPP 5G specifications.
Cellular manager for mobile phones/modems
Frontend for ModemManager 0.6/0.7, Wader and oFono
Java VoIP Softphone (SIP) (replaced by jfPhone)