HEATKEYS

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

Free Zoiper softphone, Web Phone & SDK for windows, mac, linux & mobile phones. Get your own OEM branded and customized softphone. Free Download

3CX VOIP PBX - provides an easy to use, plug and play SIP - IP PABX for Windows. With a software based IP PBX you will save on PBX maintenance and halve your phone bill. Download the FREE edition today and break free from your proprietary phone syste...

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.

Blink, a state of the art, easy to use SIP client

Office SIP Server is free VoIP and Instant Messaging Software

VentureVoIP is a research and development company in the field of Message Broadcasting, Predictive Dialing, PABX, Call Centre Systems and Telephone Exchanges.

Kapanga Softphone is the premier SIP software phone integrating voice, video and fax over IP communications in one single application. Kapanga Softphone lets people make phone calls, video calls and send and receive fax while connected to a Voice ove...

Homer - live conferencing and more: Homer is a free cross-platform SIP softphone with video support. Moreover, video/audio streaming, recording and screencasting are supported.

Avaya, a global leader in business communications, provides solutions directly and through its channel partners to leading enterprises around the world.