VoIP modem

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VoIP modem

(1) (Voice Over IP modem) A device that converts Internet-based voice service from the cable or telephone company to the user's telephones. Officially called an analog telephone adapter.

(2) (Voice Over IP modem) A device that converts Internet-based voice service from the cable company to the user's analog telephones. A VoIP modem combines a DOCSIS cable modem and analog telephone adapter (ATA) in one unit. Officially an "embedded-multimedia terminal adapter" (E-MTA), the modem converts the cable company signals to packets and vice versa, and the terminal adapter converts the packets to analog voice and vice versa. The adapter also delivers dial tone and manages the call setup.

If the VoIP modem supports cable access, it may be called a "VoIP cable modem," and for DSL telephone access, a "VoIP DSL modem."

CableLabs Certification
PacketCable certification from CableLabs ensures that quality of service (QoS) and other critical telephony and real-time functions are supported for delivering multimedia over IP. See analog telephone adapter, VoIP, cable modem and DOCSIS.

Combined and Separate Units
A VoIP modem can stand alone for VoIP conversion only, or it can be combined with a cable or DSL modem for both voice and data over the Internet.

Connecting a VoIP Cable Modem
This wiring diagram for a Cisco VoIP cable modem shows the coaxial line (RF cable) from the cable company coming into the unit. Analog outputs go to the telephones, and digital output to the PC (or to a switch for more connectivity). (Image courtesy of Cisco Systems, Inc.)
References in periodicals archive ?
In addition to the wide range of regular VOIP features, the E-MTA is designed to support the ETSI/IPCable standards.
They performed strongly across nearly all the segments that they compete in, making moderate market share gains in the total and E-MTA cable modems, Wi-Fi aggregators, and residential gateway segments.
Taiwanese E-MTA Shipment Volume by Production Location, 1Q 2006 - 4Q 2008
The report finds that the overall Taiwanese cable modem shipment volume merely posted slight increase in the first quarter of 2008, while the share of E-MTA shipment continued to grow.
OpsLogic FieldView's web-based, on-demand access offers real-time status information about customer cable modem and E-MTA devices, while correlating status information from customer billing and provisioning systems.
The relationship enables both companies to ensure ongoing interoperability between MetaSwitch's CMS/CSCF and media/signaling gateway with the ARRIS C4[R] CMTS and Touchstone E-MTA products, as each company adds new features and functionality.
com) today announced that CableLabs[R] has certified its newest product for the Cable Service Provider market, the EZ Connect[TM] E-MTA (SMC8414WG), for compliance with the PacketCable[TM] 1.