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A telephone VoIP adapter (TVA), also called digital telephone adapter, is a device that interfaces digital private branch exchange (PBX) telephone sets to a Voice over Internet Protocol (VoIP) network, using, for example, the Session Initiation Protocol.
A typical analog telephone adapter for connecting an analog phone to a VoIP provider Wikimedia Commons has media related to Analog telephony 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 modems are used for telephony and answering machine applications. Similar to the Hayes command set used for data modems, in which the host PC commands the modem via a series of commands known as AT commands, there exists a well-defined set of common voice AT commands that are somewhat consistent throughout the industry.
Obihai Technology was a company that manufactures analog telephone adapters that supported Session Initiation Protocol (SIP), XMPP, and Google Voice [2] compatible Internet telephony. Obihai was sold to Polycom in 2018, with Poly and Plantronics sold to HP in 2022. Most items in the former Obihai product line have been either rebranded as Poly ...
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.
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An embedded ATA is known as an embedded multimedia terminal adapter (E-MTA). Many cable TV service providers also offer VoIP-based telephone service via the cable infrastructure ( PacketCable ). Some high-speed Internet customers may use VoIP telephony by subscribing to a third-party service, such as Vonage , MagicJack+ and NetTALK .
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