Gateway Application - AudioCodes Mediant 3000 User Manual

User's Manual
4. The device routes the dialog to an IP Group (destination), using the IP-to-IP Routing
table. The destination SRD (and thus, SIP Interface and Media Realm) is the one
assigned to the IP Group. Outbound manipulation can be applied to the outgoing
dialog.
1.3.2

Gateway Application

The objective of your configuration is to enable the device to forward calls between the IP-
based endpoints and PSTN-based endpoints. The PSTN-based endpoints can be digital
endpoints such as ISDN trunks. The IP-based endpoints (SIP entities) can be servers such
as SIP proxy servers and IP PBXs, or end users such as LAN IP phones. In the SIP world,
the endpoints are referred to as SIP user agents (UA). The UA that initiates the call is
referred to as the user agent client (UAC); the UA that accepts the call is referred to as the
user-agent server (UAS).
The following table describes the main configuration concepts and terminology.
Configuration Terms
IP Groups
Proxy Sets
SIP Interfaces
Media Realms
Version 7.0
Table 1-3: Configuration Concepts and Terminology
The IP Group is a logical representation of the SIP entity (UA) with which
the device receives and sends calls. The SIP entity can be a server (e.g.,
IP PBX or SIP Trunk) or it can be a group of users (e.g., LAN IP phones).
For servers, the IP Group is typically used to define the address of the
entity (by its associated Proxy Set). IP Groups are used in IP-to-Tel and
Tel-to-IP routing rules to denote the source and destination of the call
respectively.
The Proxy Set defines the actual address (IP address or FQDN) of SIP
entities that are servers (e.g., IP PBX). As the IP Group represents the
SIP entity, to associate an address with the SIP entity, the Proxy Set is
assigned to the IP Group.
The SIP Interface represents a Layer-3 network for the IP-based SIP
entity. It defines a local listening port for SIP signaling traffic on a local,
logical IP network interface. The term local implies that it's a logical port
and network interface on the device. The SIP Interface is used to receive
and send SIP messages with a specific SIP entity (IP Group). Therefore,
you can create a SIP Interface for each SIP entity in the VoIP network
with which your device needs to communicate.
The SIP Interface is associated with the SIP entity, by assigning the SIP
Interface to an SRD that is in turn, assigned to the IP Group of the SIP
entity.
The Media Realm defines a local UDP port range for RTP (media) traffic
on any one of the device's logical IP network interfaces. The Media
Realm is used to receive and send media traffic with a specific SIP entity
(IP Group).
The Media Realm can be associated with the SIP entity, by assigning the
Media Realm to the IP Group of the SIP entity, or by assigning it to the
SIP Interface associated with the SIP entity.
Description
37
1. Introduction
Mediant 3000