AudioCodes Mediant 500 MSBR, User Manual

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Version 7.2 1057 Mediant 500 MSBR
User's Manual 74. Configuration Parameters Reference
"OffHook Indicator" Information Element (IE) to SIP INVITE’s
Request-URI and Contact headers. (Note: For IP-to-ISDN calls, the
device handles the call as described in option [3].) This option is
applicable only to digital interfaces.

The device interworks ISDN Setup with an Off Hook Indicator of
“Voice” to SIP INVITE Request-URI and Contact header with
“tgrp=hotline;trunk-context=dsn.mil”.

The device interworks ISDN Setup with an Off Hook indicator of
“Data” to SIP INVITE Request-URI and Contact header with
“tgrp=hotline-ccdata;trunk-context=dsn.mil”.

If ISDN Setup does not contain an Off Hook Indicator IE and the
Bearer Capability IE contains “Unrestricted 64k”, the outgoing
INVITE Request-URI and Contact header includes
“tgrp=ccdata;trunk-context=dsn.mil”. If the Bearer Capability IE
contains “Speech”, the INVITE in this case does not contain 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-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.