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A telephone VoIP adapter , also called digital telephone adapter, is a device that allows digital PBX telephone handsets to be connected to a VoIP network, using, for example, Session Initiation Protocol.
An ATA allows analog phones to be connected to VoIP networks.
A Centrex TVA VoIP enables centrex phones and analog-based Centrex phones like BT Featureline.
Some telecom manufacturers have produced hybrid exchanges with TVA-like elements that support IP phones and also have units or cards that allow connection of digital phones.
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