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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 ...
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.
Traditional PSTN phones can be used as VoIP phones with analog telephone adapters (ATA). A VoIP phone or application may have many features an analog phone doesn't support, such as e-mail-like IDs for contacts that may be easier to remember than names or phone numbers, or easy sharing of contact lists among multiple accounts.
However, calls that have ISDN or VoIP on one end usually terminate to an analog line at the other, and so there is a significant source of echo from both the telco hybrid on the line card and the phone itself. Acoustic coupling, when the microphone picks up the output of the earpiece, is another potential source of echo.
Since most VoIP codecs are designed only to carry speech signals, successful modem-over-VoIP operation generally requires the use of G.711 coding on the VoIP audio link, emulating the channel capabilities of a digital PSTN connection. [1] ITU-T V.152 describes one way of implementing G.711 passthrough.
The susceptibility of phone service to power failures is a common problem even with traditional analog service where customers purchase telephone units that operate with wireless handsets to a base station, or that have other modern phone features, such as built-in voicemail or phone book features. VoIP phones and VoIP telephone adapters ...