AudioCodes Mediant 500L - Page 1078

User's Manual 1078 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Parameter Description
context=dsn.mil” in the Contact header.
- If ISDN Setup does not contain an Off Hook Indicator IE and
the Bearer Capability IE contains “Unrestricted 64k”, the
outgoing INVITE 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.
 [4] Hotline Extended = Interworks the ISDN Setup message’s
hotline "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].)

The device interworks ISDN Setup wi
th 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