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Unicall is an abstraction layer for telephony signaling, and some telephony protocol modules to go with it.

is a library of many DSP functions for telephony. These range from simple modules, such as DTMF detection, to a complete software fax machine.

Updated daily with the latest news regarding Asterisk, VoIP News, Telephony and more useful pieces of information to help you expand your knowledge.

This Wiki covers everything related to VoIP, software, hardware, service providers, reviews, configurations, standards, tips & tricks and everything else related to voice over IP networks, IP telephony and Internet Telephony.

is a next-generation telephony engine, currently focused on Voice over Internet Protocol (VoIP) and PSTN, it's able to be easily extended. Voice, video, data and instant messaging can all be unified under Yate's flexible routing engine, maximizing communications efficiency and minimizing infrastructure costs for businesses.

Asterisk is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk does voice over IP in many protocols, and can interoperate with almost all standards-based telephony equipment using cost-effective hardware.

The RFC Archive lists all IETF RFCs, Internet Protocol Standards, Draft Standards, and Best Current Practices since 1969.

The IP/MPLS Forum is an international, industry-wide, non-profit association of service providers, equipment vendors, testing centers and enterprise users. The mission of the Forum is to drive the global adoption of IP/MPLS-based technology, networks, services and solutions.

freshmeat maintains the Web's largest index of Unix and cross-platform software. It is continuously updated with the latest developments from the "release early, release often" community.