User's Manual 1134 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Parameter Description
tgrp and trunk-context parameters.
Note: IP-to-Tel configuration (using the PSTNPrefix parameter)
overrides the 'tgrp' parameter in incoming INVITE messages.
TGRP Routing Precedence
configure voip > gateway
routing settings > tgrp-
routing-prec
[TGRProutingPrecedence]
Determines the precedence method for routing IP-to-Tel calls -
according to the IP-to-Tel Routing table or according to the SIP 'tgrp'
parameter.
[0] = (Default) IP-to-Tel routing is determined by the IP-to-Tel
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-URI does not
contain the 'tgrp' parameter or if the Trunk Group number is not
defined, the IP-to-Tel 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
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-
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
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