Cisco ATA 191 Quick Start Guide

Cisco ATA 191 Analog Telephone Adapter
Overview
• Your Analog Telephone Adapter, on page 1
Your Analog Telephone Adapter
The ATA 191 analog telephone adapter is a telephony-device-to-Ethernet adapter that allows regular analog
phones to operate on IP-based telephony networks. The ATA 191 supports two voice ports, each with an
independent phone number. The ATA 191 also has an RJ-45 10/100BASE-T data port.
Figure 1: Cisco Analog Telephone Adapter
Session Initiation Protocol
Session Initiation Protocol (SIP) is the Internet Engineering Task Force (IETF) standard for real-time calls
and conferencing over Internet Protocol (IP). SIP is an ASCII-based, application-layer control protocol (defined
in RFC3261). It is used to establish, maintain, and terminate multimedia sessions or calls between two or
more endpoints.
Like other Voice over IP (VoIP) protocols, SIP is designed to address the functions of signaling and session
management within a packet telephony network. Signaling allows call information to be carried across network
boundaries. Session management is used to control the attributes of an end-to-end call.
Cisco ATA 191 Analog Telephone Adapter Overview
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Cisco ATA 191 Specifications

General

Brand	Cisco
Model	ATA 191
Category	Adapter
Language	English