Introduce
R7121-L1/R7141-L1/R7111-L1 series are the low cost VoIP Solutions. This document describes the
usage of R7121-L1/R7141-L1/R7111-L1 (Analogue Telephone Adapter)
1.1 Overview
An Analogue Telephone Adapter, or R7121-L1/R7141-L1, is a device that allows one to connect a
normal PSTN telephone to the Internet in order to make or place telephone calls.
R7121-L1/R7141-L1 provides a direct analog interface for PSTN, PBX, fax machines, analog telephones,
and other devices that require an analog port.
1.2 Audience
This document is intended for system vendor who are using R7121-L1/R7141-L1 to build an Internet
telephony gateway or server application. It is assumed that the reader has the general knowledge of VoIP
applications and products.
1.3 Acronyms Table
Analog to Digital Converter
Digital to Analog Converter
Dynamic Host Configuration Protocol
Dynamic Domain Name System
Dual Tone Multi Frequency
Network Address Translation
Point-to-Point Tunneling Protocol
Real-Time Transport Control
Protocol (also known as RTP control
protocol)
Real-Time Transport Protocol
Subscriber Line Interface Circuit
Session Initiation Protocol
Uniform Resource Identifier
Simple Traversal of UDP through
NATs
User DSR-100gram Protocol
Transmission Control Protocol
Voice Over Internet Protocol
1.4 Introduction
This Analogue Telephone Adapter (R7121-L1/R7141-L1/R7111-L1) provides a total solution for
integrating voice-data network and PSTN.
The R7121-L1 Analogue Telephone Adapter (R7121-L1) support SIP VoIP Protocol.The R7121-L1
Analogue Telephone Adapter (R7121-L1) allows 1~2 lines analog voice and fax communication over a
traditional data communications/data networking digital Internet.
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