User's Manual 854 Document #: LTRT-10466
Mediant 500L MSBR
Parameter Description
overrides the 'tgrp' parameter in incoming INVITE messages.
Web/EMS: TGRP Routing
Precedence
CLI: tgrp-routing-prec
[TGRProutingPrecedence]
Determines the precedence method for routing IP-to-Tel calls -
according to the Inbound IP Routing table or according to the SIP
'tgrp' parameter.
[0] = (Default) IP-to-Tel routing is determined by the Inbound IP
Routing table (PSTNPrefix parameter). If a matching rule is not
found in this table, the device uses the Trunk Group parameters
for routing the call.
[1] = The device first places precedence on the 'tgrp' parameter
for IP-to-Tel routing. If the received INVITE Request-
contain the 'tgrp' parameter or if the Trunk Group number is not
defined, the Inbound IP Routing table is used for routing the call.
Below is an example of an INVITE Request-URI with the 'tgrp'
parameter, indicating that the IP call should be routed to Trunk
Group 7:
INVITE sip:200;tgrp=7;trunk-
context=example.com@10.33.2.68;user=phone SIP/2.0
Notes:
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.
CLI: 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 this 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. This 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 Inbound IP Routing table is used instead for routing the call to
the appropriate Trunk Group.
Web/EMS: Enable GRUU
CLI: 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
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