AudioCodes Mediant 4000 SBC User Manual page 36

CHAPTER 1 Introduction
Configuration
Terms
Proxy Set
SIP Interface
Media Realm
SRD
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).
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.
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.
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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Mediant 4000 SBC | User's Manual
Description