Version 7.0 33 Mediant 3000
User's Manual 1. Introduction
1.3 Getting Familiar with Configuration Concepts and
Terminology
Before using your device, it is recommended that you familiarize yourself with the basic
configuration concepts and terminology. An understanding of the basic concepts and
terminology will help you configure and manage your device more effectively and easily.
1.3.1 SBC Application
The objective of your configuration is to enable the device to forward calls between
telephony endpoints in the SIP-based Voice-over-IP (VoIP) network. The endpoints (SIP
entities) can be servers such as SIP proxy servers and IP PBXs, or end users such as 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.
Table 1-2: Configuration Concepts and Terminology
Configuration Terms Description
IP Group 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-IP routing
rules to denote the source and destination of the call.
Proxy Set 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. You can assign the same Proxy Set to multiple
IP Groups (belonging to the same SRD).
SIP Interface The SIP Interface represents a Layer-3 network. 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. For example, if your VoIP network
consists of three SIP entities -- a SIP Trunk, a LAN IP PBX, and remote
WAN users -- a SIP Interface can be created for each of these Layer-3
networks.
The SIP Interface is associated with the SIP entity, by assigning it to an
SRD that is in turn, assigned to the IP Group of the SIP entity.
Media Realm 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.
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