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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.
In modern day usage, "foreign exchange office" (FXO) and "foreign exchange station" (FXS) refer to the different ends of a telephone line in the context of voice over IP (VoIP) systems and its interconnection with analog telephony equipment. The FXO side is used for the telephone, and the FXS side is the analog telephone adapter.
Despite being inherently four-wire, [citation needed] VoIP systems require hybrids when they interface to two-wire lines. A VoIP-to-Telco gateway used to interface a VoIP PBX (private branch exchange) to analog lines would contain hybrids to perform the required conversion. End-end VoIP needs no hybrids unless adaptation to a two-wire line is ...
Regular telephones can also be used for VoIP by connecting them to the Internet via analog telephone adapters (ATAs), which convert traditional telephone signals into digital data packets that can be transmitted over IP networks.
This use of G.711 coding is sometimes called 'fax pass-through' as it enables analog fax transmission (which also uses a modem connection) over VoIP. [2] G.711 modem-over-VoIP communication can be useful for connecting an Internet-connected computer to a dial-up system that only has modem connectivity over the PSTN.
The gateways are then connected to an IP network (such as the Internet). The analog connection from the modem is terminated at the gateway and the signal is demodulated. The demodulated control signals are transported over the IP network in an RTP packet type defined as State Signaling Events (SSEs).
Retail customers of an ITSP may use traditional analog telephone sets attached to an analog telephony adapter (ATA) to connect to the service provider's network via a local area network, they may use an IP phone, or they may connect a private branch exchange (PBX) system to the service via media gateways.
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