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ENUM

The bridge between the switched telephony network and the Internet

Media Gateways
Devices which bridge conventional telephone networks and equipment to VoIP telephone networks.

FXS-FXO Converters

Use this to create a VOIP to PSTN gateway and only have an ATA with an FXS port

Connect VoIP GSM gateway to Asterisk PBX

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Voice over Internet Protocol. A technology for transmitting ordinary telephone calls over the Internet using packetlinked routes. Also called IP telephony

There are two major reasons to use VOIP
- Lower Cost

- Increased functionality

A way is required to turn analog phone signals into digital signals that can be sent over the Internet.

This function can either be included into the phone itself or in a separate box like an ATA .

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