AudioCodes Mediant 500 MSBR, Руководство пользователя

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Version 7.2 457 Mediant 500 MSBR
User's Manual 24. Introduction
24 Introduction
This section describes configuration of the Gateway application. The Gateway application
refers to IP-to-Tel (PSTN for digital interfaces) and Tel-to-IP call routing. For analog
interfaces, Tel refers to FXO or FXS. For digital interfaces, Tel refers to the PSTN.
Note:
•
In some areas of the Web interface, the term "GW" refers to the Gateway
application.
•
The terms IP-to-Tel and Tel-to-IP refer to the direction of the call relative to the
device. IP-to-Tel refers to calls received from the IP network and destined to the
PSTN/PBX (i.e., telephone connected directly or indirectly to the device); Tel-to-IP
refers to calls received from telephones connected directly to the device's FXS
ports or from the PSTN/PBX, and destined for the IP network.
•
FXO (Foreign Exchange Office) is the interface replacing the analog telephone
and connects to a Public Switched Telephone Network (PSTN) line from the
Central Office (CO) or to a Private Branch Exchange (PBX). The FXO is designed
to receive line voltage and ringing current, supplied from the CO or the PBX (just
like an analog telephone). An FXO VoIP device interfaces between the CO/PBX
line and the Internet.
•
FXS (Foreign Exchange Station) is the interface replacing the Exchange (i.e., the
CO or the PBX) and connects to analog telephones, dial-up modems, and fax
machines. The FXS is designed to supply line voltage and ringing current to these
telephone devices. An FXS VoIP device interfaces between the analog telephone
devices and the Internet.
24.1 Call Processing Summary
The device's call processing for Gateway calls is shown in the following flowcharts.