Analog phone adapter

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Analog telephone adapter VoIP Grandstream HT486

An analog telephone adapter ( ATA, often also called SIP adapter or named after another supported protocol) is a device that connects to one or more analog standard telephones via the Voice-over-IP network. Usually it is a small box with an Ethernet port for internet access and one or more telephone connections. This enables existing analog telephones to continue to be used for Voice over IP.

The spread of these adapters as single devices for operating telephones is declining, as the adapters are mostly integrated in DSL routers / gateways, e.g. B. most of the models of the Fritz! Box from AVM . Even pure new telephone connections from the telephone provider are often only offered as a Next Generation Network (NGN), in which the provider provides an Integrated Access Device (IAD) with which telephone calls can be made via Voice over IP.

A common area of ​​application for ATAs is the connection of conventional fax machines to VoIP. In this case, the fax information is usually transmitted using the T.38 method.

Technical details

ATAs almost always use SIP or IAX as the protocol.

Complete telephone systems can also be connected to ATAs using additional hardware . To connect the telephone system to an ATA, a free extension of the telephone system is required. This makes it possible to use VoIP from every extension of the telephone system by dialing the extension to which the ATA is connected.