AudioCodes MSBG Series User Manual

User's Manual 998 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
7:
INVITE sip:200;tgrp=7;trunk-
context=example.com@10.33.2.68;user=phone SIP/2.0
Note:
 For enabling routing based on the 'tgrp' parameter, the UseSIPTgrp
parameter must be set to 2.
 For IP-to-Tel routing based on the 'dtg' parameter (instead of the
'tgrp' parameter), use the parameter UseBroadsoftDTG.
configure voip > sip-
definition settings > use-dtg
[UseBroadsoftDTG]
Determines whether the device uses the 'dtg' parameter for routing IP-
to-Tel calls to a specific Trunk Group.
 [0] Disable (default)
 [1] Enable
When the parameter is enabled, if the Request-
URI in the received SIP
INVITE includes the 'dtg' parameter, the device routes the call to the
Trunk Group according to its value. The parameter is used instead of
the 'tgrp/trunk-context' parameters. The 'dtg' parameter appears in the
INVITE Request-URI (and in the To header).
For example, the received SIP message below routes the call to Trunk
Group ID 56:
INVITE sip:123456@192.168.1.2;dtg=56;user=phone SIP/2.0
Note: If the Trunk Group is not found based on the 'dtg' parameter, the
IP-to-Tel Routing table is used instead for routing the call to the
appropriate Trunk Group.
Enable GRUU
configure voip > sbc settings
> enable-gruu
[EnableGRUU]
Determines whether the Globally Routable User Agent URIs (GRUU)
mechanism is used, according to RFC 5627. This is used for obtaining
a GRUU from a registrar and for communicating a GRUU to a peer
within a dialog.
 [0] Disable (default)
 [1] Enable
A GRUU is a SIP URI that routes to an instance-specific UA and can
be reachable from anywhere. There are a number of contexts in which
it is desirable to have an identifier that addresses a single UA (using
GRUU) rather than the group of UA’s indicated by an Address of
Record (AOR). For example, in call transfer where user A is talking to
user B, and user A wants to transfer the call to user C. User A sends a
REFER to user C:
REFER sip:C@domain.com SIP/2.0
From: sip:A@domain.com;tag=99asd
To: sip:C@domain.com
Refer-To: (URI that identifies B's UA)
The Refer-To header needs to contain a URI that user C can use to
place a call to user B. This call needs to route to the specific UA
instance that user B is using to talk to user A. User B should provide
user A with a URI that has to be usable by anyone. It needs to be a
GRUU.
 Obtaining a GRUU: The mechanism for obtaining a GRUU is
through registrations. A UA can obtain a GRUU by generating a
REGISTER request containing a Supported header field with the
value “gruu”. The UA includes a “+sip.instance” Contact header
parameter of each contact for which the GRUU is desired. This
Contact parameter contains a globally unique ID that identifies the

AudioCodes MSBG Series Specifications

General

Brand	AudioCodes
Model	MSBG Series
Category	Gateway
Language	English