Baresip is a portable and modular SIP User-Agent with audio and video support. Tries to be a Swiss Army knife for SIP and VoIP. Supports encryption. Has an embedded web server with an HTTP (REST?) API for controlling the utility. Modular architecture.
A group of telephony hobbyists who restore and maintain old equipment. They figure out how to get their gear VoIP-enabled and built their own PSTN on top of the Net by hooking everything together. It's pretty serious, plus they document their work pretty well.
A SIP softphone for Linux.
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A security testing application that determines if Cisco VoIP hardware is in use, and if so drops the attacking box onto the VoIP VLAN by impersonating an IP telephone through a new virtual interface.
A lengthy how-to article about building an open source PBX using Linux and Asterisk that uses wireless for its network link. A fully portable wireless telephony system, in other words.
A free online service that makes it easy to put people in touch with you without revealing your cellphone number. Create an account and chose a unique identifier. Give your letscall.me/foo URL to people. They go to that URL, plug in their phone number, and letscall.me calls both of you and connects you to one another. Handy! It&039;s much more difficult for the person calling you to hide their phone number of origin - caller ID blocking doesn&039;t work, at the very least.
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UCSniff is a VoIP & IP Video Security Assessment tool that integrates existing open source software into several useful features, allowing VoIP and IP Video owners and security professionals to rapidly test for the threat of unauthorized VoIP and Video Eavesdropping. Written in C/C++, and available on Linux and Windows, the software is free and available for anyone to download, under the GPLv3 license.
A software modem that pretends to be an analog dialup modem from the old days, only for communications it uses the IAX protocol to connect to an Asterisk VoIP switch rather than the PSTN.
A new generation of tools for scanning, exploring, and auditing telephone systems. Doesn't use a modem to do tone detection but instead analyzes the recorded sounds in software. Designed for use over a VoIP system.
An opensource voice chat system for use by gamers. Client/server architecture. Runs on Windows, Linux, an OSX.
A lightweight implementation of the server side of the Mumble protocol. Intended for use on embedded systems, but should compile just fine on full OSes. It specifically runs on Arch Linux and NetBSD, anyway...
Github repo: https://github.com/DoubangoTelecom/sipml5
A telecom provider that runs interference for you when it comes to spammers and autodialers. voip Their bots talk to telemarketers so you don't have to. Subscription service, one account is good for three phones. When you get an annoying call, forward it to one of their bots; after the fact they send you a recording for the lulz. Pick your bot. They even have a business class of service for a dollar more.
github repo for a FOSS speechrecognition package. Supports over 100 languages and accents. Fairly lightweight in terms of dependencies. Can also output audio itself. Extended dictionaries can be added.
Jitsi is a F/OSS multiprotocol text chat/voice over IP/video chat application. It supports a large number of instant messaging and VoIP protocols, not only for IM but as transport and control channels for VoIP and video conferencing. If there's a way to get your streams through it'll do it. Natively supports OTR for protecting chats. Implements SRTP and ZRTP for encrypted conferencing. Supports DNSSEC. Aims to replace Skype as a more secure, open source package.