Must have VoIP Software for Windows

From the developer: "DaddyCall lets you place calls over the Internet from your PC to any phone in the world. Calls to the US and UK are as low as 3.9 cents a minute. This version adds Windows 2000 compatibility. DaddyCall is set up to provide economical...

Data Phone is data aware VOIP application which uses the industry standard Session Initiation Protocol (SIP). Data Phone integrates phone functionality with MS SQL databases or Windows Azure cloud services, allowing you to easily interface telephony...

A network voice communication tool, which includes Delephone Client and Delephone Server. The server accurately tracks its clients' calls and even provides integrated real-time billing. Delephone uses custom high performance VoIP protocol, supports high...

Complete Call Center Software for All your Needs. Our application is composed of effective communication tools, designed to ensure maximum productivity and effectiveness in administering and executing telemarketing campaigns and customer service. It...

DialDirectly can dial/redial names and phone numbers directly via Skype. Copy names and phone numbers from any application by pressing customizable hotkeys and dial them via Skype. The last 10 numbers are available for redialling. The program can be...

Dialo is a call manager, allowing you to select and dial any phone number directly from your PC. It works with Cisco IP phones connected to your local network and it can send several commands such as dial, end, hold on each extension you select. Select...

Dialpad allows you to use your PC to make phone calls all over the world. Calls to and within the U.S. are as low as 1.7 cents per minute. International rates to and from over 200 countries are as low as 2.9 cents per minute. Start saving money on your...

DialTrix's Free VoIP Softphone allows you to make very cheap domestic or international PC-to-Phone calls. With the VoIP technology on our side, and following simple steps to start calling, our softphone for windows can be a good solutions for residential...

All-in-one voice and text chat for gamers that's free, secure, and works on both your desktop and phone. Discord is always completely free to use with no gotchas. This means you can make as many servers as you want with no slot limitations. Encrypted...

Doddle is a free online SIP webphone for your webpage. It works with couple of VoIP providers or you can even fill it with your own SIP settings details. There is no desktop software to be downloaded at all. It just uses Java plugin( JVM ) which by...