Analog to VoIP Gateway
Voice over Internet Protocol (VoIP) is a method of communicating over the internet in much the same manner as with a telephone. A VoIP to analog gateway is a device that connects a VoIP system to an analog system.
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In the Home
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Most people who use a VoIP system will want to have a device that allows them to connect their old telephones to the VoIP network that they use. While this kind of device is technically a VoIP to analog gateway, it is more commonly referred to as an analog telephone adapter. Most of them connect directly to an ethernet network, but some are wireless and a few are USB devices that connect directly to a computer.
In the Enterprise
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The other kind of VoIP to analog gateway is the one that VoIP providers use to send VoIP internet traffic out into the telephone system. A device of this type connects many VoIP customers at once. Incidentally, they usually don't connect directly to the analog network--technically, they transcode the digitized voice signal from the format that the VoIP network uses into one that a modern digital telephone switch can use.
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In the Office
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In many modern offices, they now use telephones that have the circuitry found in a VoIP telephone adapter built into the phone itself, and the phone plugs directly into the ethernet network. Functionally, the end result is the same, except that the business class VoIP usually involves the use of a VoIP PBX system. These systems use ethernet connections inside the local network, but connect to the telephone system in the same way that traditional PBXs do.
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References
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