Version 7.2 33 Mediant 800B Gateway & E-SBC
User's Manual 1. Introduction
Configuration Terms Description
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.
SRD The SRD is a logical representation of your entire SIP-based VoIP
network (Layer 5) containing groups of SIP users and servers. The SRD
is in effect, the foundation of your configuration to which all other
previously mentioned configuration entities are associated. For example,
if your VoIP network consists of three SIP entities -- a SIP Trunk, a LAN
IP PBX, and remote WAN users -- the three SIP Interfaces defining these
Layer-3 networks would all assigned to the same SRD.
Typically, only a single SRD is required and this is the recommended
configuration topology. As the device provides a default SRD, in a single
SRD topology, the device automatically assigns the SRD to newly created
configuration entities. Thus, in such scenarios, there is no need to get
involved with SRD configuration.
Multiple SRDs are required only for multi-tenant deployments, where it
"splits" the device into multiple logical devices. For multiple SRDs, the
SRD can be configured with a Sharing Policy. The Sharing Policy simply
means whether the SRD's resources (SIP Interfaces, IP Groups, and
Proxy Sets) can be used by other SRDs. For example, if all tenants route
calls with the same SIP Trunking service provider, the SRD of the SIP
Trunk would be configured as a Shared Sharing Policy. SRDs whose
resources are not shared, would be configured with an Isolated Sharing
Policy.
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