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Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.

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Linphone, Free SIP VOIP client, open-source voip software for Linux, windows, mac, iphone, android. Free sip voip sdk.

Elastix, the Open Source Unified Communications Server.

Phone systems to power your business. Turnkey business phone systems, IP PBX phone systems, VoIP phone systems, and Asterisk telephony software.

Get Business VoIP Phones, VoIP Phone Systems and other VoIP Equipment for your VoIP solution. VoIP Supply is North America’s leading supplier of VoIP equipment and hardware. Over 85,00 served since 2002.

OpenVBX allows developers to build voice and SMS applications for business, such as toll free phone numbers, call forwarding, voicemail, visual voicemail, voicemail transcriptions, and auto-attendants. It

We build scalable, open-source, next-generation VoIP solutions that power phone companies and cloud services. Our infrastructure is easy-to-use, built to scale and designed to simplify.

Sangoma is a leading provider of hardware and software components that enable or enhance IP Communications Systems for both telecom and datacom applications.