Specifications

AT-VP504E FXS 1

Getting Started

This chapter presents the AT-VP504E FXS. It describes the physical

device and introduces the Simple Network Management Protocol

(SNMP) as remote management tool.

Overview The AT-VP504E FXS is a standalone Internet telephony terminal that

connects to virtually any business telephone system supporting

standard analog lines. It uses industry standard components and is

designed for maximum system integration and scalability.

This version of the AT-VP504E FXS can use either one of the following

signalling protocols:

the Session Initiation Protocol (SIP), which is a simple

signalling protocol for Internet conferencing and

telephony.

the Media Gateway Control Protocol (MGCP), which is a

protocol for controlling Voice over IP (VoIP) Gateways

from intelligent external call control elements.

MGCP uses the Master/Slave concept, where external call

control elements are the Masters, while the devices

connected to them (such as the AT-VP504E FXS), are the

Slaves and only obey orders given by the Master.

The AT-VP504E FXS is used with any MGCP Call Agent

(also known as Connection Manager), which manages calls

from and to the AT-VP504E FXS.

You can switch from one signalling protocol to the other. See “MIB

Structure” on page 8 for more information.

Why use the

AT-VP504E

FXS?

There are many reasons to use the AT-VP504E FXS:

Merges voice and data traffic onto a single unified

network.

Carrying telephone traffic over data networks uses less

bandwidth (as compared to telephone trunks), resulting in a