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2. Analog telephone adapter - Wikipedia

   en.wikipedia.org/wiki/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.

3. Media Gateway Control Protocol - Wikipedia

   en.wikipedia.org/wiki/Media_Gateway_Control_Protocol

   The Media Gateway Control Protocol (MGCP) is a telecommunication protocol for signaling and call control in hybrid voice over IP (VoIP) and traditional telecommunication systems. It implements the media gateway control protocol architecture for controlling media gateways connected to the public switched telephone network (PSTN). [ 1 ]

4. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   A VoIP media gateway controller (aka Class 5 Softswitch) works in cooperation with a media gateway (aka IP Business Gateway) and connects the digital media stream, so as to complete the path for voice and data. Gateways include interfaces for connecting to standard PSTN networks.

5. Media gateway control protocol architecture - Wikipedia

   en.wikipedia.org/wiki/Media_Gateway_Control...

   Media gateway were capable of acting as a voice over IP gateway, voice over ATM gateway, dialup modem media gateway, circuit switch, or cross- connect. In October 1998, Simple Gateway Control Protocol (SGCP) was combined with Internet Protocol Device Control (IPDC), resulting in MGCP.

6. H.323 - Wikipedia

   en.wikipedia.org/wiki/H.323

   The first version of H.323 was published by the ITU in November 1996 [4] with an emphasis of enabling videoconferencing capabilities over a local area network (LAN), but was quickly adopted by the industry as a means of transmitting voice communication over a variety of IP networks, including WANs and the Internet (see VoIP).

7. Modem over VoIP - Wikipedia

   en.wikipedia.org/wiki/Modem_over_VoIP

   An alternative to G.711 passthrough is the use of ITU-T V.150.1, also known as Modem over IP, which demodulates and remodulates modem data at gateways, forwarding the data over IP between them. This has the advantage that it can also handle some of the signalling aspects of modem connections.