E-MTA - technical definition

(Embedded-Multimedia Terminal Adapter) A device that combines a DOCSIS cable modem and analog telephone adapter. The cable modem provides the data interface, and the telephone adapter provides the voice over IP (VoIP) interface for one or more analog telephones. The terminal adapter provides the conversion between analog voice signals and IP packets, delivers dial tone and manages the call setup.

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 VoIP, telephony modem, cable modem and DOCSIS.