AudioCodes Mediant 3000 User Manual page 210

Parameter
Description
[IPGroup_Description]
Proxy Set ID
[IPGroup_ProxySetId]
SIP User's Manual
USER-type IP Group. Each SIP request sent by a user of this IP
Group is proxied to the Serving IP Group. For registrations, the
device updates its internal database with the AOR and contacts of
the users.
Digest authentication using SIP 401/407 responses (if needed) is
performed by the Serving IP Group. The device forwards these
responses directly to the SIP users.
To route a call to a registered user, a rule must be configured in the
Outbound IP Routing Table table (see Configuring Outbound IP
Routing Table on page 298). The device searches the dynamic
database (by using the request URI) for an entry that matches a
registered AOR or Contact. Once an entry is found, the IP
destination is obtained from this entry, and a SIP request is sent to
the destination. The device supports up to 2000 registered users.
The device also supports NAT traversal for the SIP clients that are
behind NAT. In this case, the device must be defined with a global
IP address.

[2] GATEWAY = This is applicable only to the SBC application in
scenarios where the device receives requests to and from a
gateway representing multiple users. This IP Group type is
necessary as the other IP Group types are not suitable:

The IP Group cannot be defined as a SERVER since its
destination address is unknown during configuration.

The IP Group cannot be defined as a USER since the SIP
Contact header of the incoming REGISTER does not represent
a specific user. The Request-URI user part can change and
therefore, the device is unable to identify an already registered
user and therefore, adds an additional record to the database.
The IP address of the "GATEWAY" IP Group is obtained
dynamically from the host part of the Contact header in the
REGISTER request received from the IP Group. Therefore, routing
to this IP Group is possible only once a REGISTER request is
received. If a REGISTER refresh request arrives, the device
updates the new location (i.e., IP address) of the IP Group. If the
REGISTER fails, no update is performed. If an UN-REGISTER
request arrives, the IP address associated with the IP Group is
deleted and therefore, no routing to the IP Group is done.
Notes:

This field is available only if the SBC or IP-to-IP application is
enabled.

Currently, the GATEWAY IP Group type can only be configured
using the IPGroup ini file parameter.
Brief string description of the IP Group.
The value range is a string of up to 29 characters. The default is an
empty field.
The Proxy Set ID (defined in 'Configuring Proxy Sets Table' on page
215) associated with the IP Group. All INVITE messages destined to
this IP Group are sent to the IP address associated with the Proxy Set.
Notes:

Proxy Set ID 0 must not be selected; this is the device's default
Proxy.

The Proxy Set is applicable only to SERVER-type IP Groups.
210
Description
Document #: LTRT-89712
Mediant 3000