CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
✔ ISDN-to-IP calls:
- The device interworks ISDN Setup with an Off Hook
Indicator of “Voice” to SIP INVITE with
“tgrp=hotline;trunk-context=dsn.mil” in the Contact
header.
- The device interworks ISDN Setup with an Off Hook
indicator of “Data” to SIP INVITE with “tgrp=hotline-
ccdata;trunk-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].) 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.
configure voip >
gateway routing
settings > tgrp-
routing-prec
[TGRProutingPrecedenc
e]
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.
- 1177 -
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