Telephone VoIP Adapter
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A telephone VoIP adapter (TVA), also called digital telephone adapter, is a device that interfaces digital
private branch exchange A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX). A business telephone system differs from ...
(PBX) telephone sets to a
Voice over Internet Protocol Voice over Internet Protocol (VoIP), also known as IP telephony, is a set of technologies used primarily for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. VoIP enables Voice call, voice calls to be tran ...
(VoIP) network, using, for example, the
Session Initiation Protocol The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. SIP is used in Internet telephony, in private IP telepho ...
. An
analog telephone adapter An analog telephone adapter (ATA) or FXS gateway is a device for connecting traditional analog telephones, fax machines, and similar customer-premises devices to a digital telephone system or a voice over IP telephone network. An ATA is often ...
(ATA) converts an analog telephone port (Foreign exchange station, FXS) to a VoIP network. A
Centrex Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises. Centrex service was first install ...
TVA interfaces centrex telephones and analog-based Centrex telephones. Some telecom manufacturers have produced hybrid exchanges with TVA-like elements that support IP telephones and also have units or cards that allow connection of digital telephones. Whether a standalone TVA or a hybrid PBX is deployed, the intention is to preserve investment in an installed base of telephones, and eliminate the need to install
Ethernet Ethernet ( ) is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 198 ...
network infrastructure.


References

Voice over IP VoIP hardware {{telephony-stub