AudioCodes Mediant 2000, User Manual

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SIP User's Manual 202 Document #: LTRT-68808
Mediant 2000
Table 3-51: IP Group Parameters Description
Parameter Description
Type The IP Group can be defined as one of the following types:
ƒ
SERVER = used when the destination address (configured by the
Proxy Set) of the IP Group (e.g., ITSP, Proxy, IP-PBX, or Application
server) is known.
ƒ
USER = represents a group of users (such as IP phones and
softphones) where their location is dynamically obtained by the device
when REGISTER requests and responses traverse (or are terminated)
by the device. These users are considered remote (far-end) users.
Typically, this IP Group is configured with a Serving IP Group that
represents an IP-PBX, Application or Proxy server that serves this
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 (refer to “Outbound IP Routing Table” on
page
178 ). 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 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.
Note:
This field is available only if EnableSBC is set to 1 (refer to “SBC
Configuration” on page 163 ).
Description Brief string description of the IP Group.
The value range is a string of up to 29 characters. The default is an empty
field.
Proxy Set ID Selects the Proxy Set ID (defined in ''Proxy Sets Table'' on page 141 ) to
associate with the IP Group. All INVITE messages configured to be 'sent'
to the specific IP Group are in fact sent to the IP address associated with
this Proxy Set.
The range is 0-5, where 0 is the default Proxy Set.
Note:
The Proxy Set is only defined for SERVER type IP Groups.
SIP Group Name The request URI host name used in INVITE and REGISTER messages
that are sent to this IP Group, or the host name in the From header of
INVITE messages received from this IP Group. If not specified, the value
of the global parameter ProxyName (refer to ''Proxy & Registration
Parameters'' on page
132 ) is used instead.
The value range is a string of up to 49 characters. The default is an empty
field.
Note:
If the IP Group is of type USER, this parameter is used internally as
a hostname in the request URI for TDM-to-IP initiated calls. For example,
if an incoming call from the device's T1 trunk is routed to a USER-type IP
Group, the device first forms the request URI
(destination_number@SIPGroupName), and then it searches the User’s
internal database for a match.
Contact User Defines the user part for the From, To, and Contact headers of SIP
REGISTER messages, and the user part for the Contact header of