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What do I need to use Voice over Internet Protocol?

For VoIP you'll need a high-speed, broadband Internet connection to make calls and use the Internet at the same time. You'll also need an analog telephone adapter, a telephone and a VoIP router.

Which ATA is best?

If you want something easy to use, look for a product that requires little more than plugging it in. If you want one with better performance and you have the capacity, look for one that uses a PBX as an interface. The setup will be a little more complicated but you'll get additional features like the ability to support many codecs.

What is the difference between software-based VoIP and hardware-based VoIP?

Software-based VoIP requires you download software to your PC before using the service. Hardware-based VoIP requires you plug your device into your router and configure your setup through your PC.