CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
■ Upon receiving a request with History-Info, the UAS checks
the policy in the request. If a 'session', 'header', or 'history'
policy tag is found, the (final) response is sent without
History-Info; otherwise, it is copied from the request.
Note: The parameter is applicable only to digital interfaces.
'Use Tgrp Information'
configure voip >
sip-definition
settings > use-
tgrp-inf
[UseSIPTgrp]
Enables the use of the SIP 'tgrp' parameter. This parameter
specifies the Trunk Group to which the call belongs (according to
RFC 4904). For example, the SIP message below indicates that
the call belongs to Trunk Group ID 1:
INVITE sip::+16305550100;tgrp=1;trunk-
context=example.com@10.1.0.3;user=phone
SIP/2.0
■ [0] Disable = (Default) The 'tgrp' parameter isn't used.
■ [1] Send Only = The Trunk Group number or name
(configured in the Trunk Group Settings table) is added to the
'tgrp' parameter value in the Contact header of outgoing SIP
messages. If a Trunk Group number / name is not associated
with the call, the 'tgrp' parameter isn't included. If a 'tgrp'
value is specified in incoming messages, it is ignored.
■ [2] Send and Receive = The functionality of outgoing SIP
messages is identical to the functionality described for option
[1]. In addition, for incoming SIP INVITEs (IP-to-Tel), if the
Request-URI includes a 'tgrp' parameter, the device routes
the call according to that value (if possible). The Contact
header in the outgoing SIP INVITE (Tel-to-IP call) contains
"tgrp=<source trunk group ID>;trunk-context=<gateway IP
address>”. The <source trunk group ID> is the Trunk Group
ID where incoming calls from Tel is received. For IP-to-Tel
calls, the SIP 200 OK device's response contains
“tgrp=<destination trunk group ID>;trunk-context=<gateway
IP address>”. The <destination trunk group ID> is the Trunk
Group ID used for outgoing Tel calls. The <gateway IP
address> in “trunk-context” can be configured using the
SIPGatewayName parameter.
■ [3] Hotline = Interworks the hotline "Off Hook Indicator"
parameter between SIP and ISDN. This option is applicable
only to digital interfaces.
✔ IP-to-ISDN calls:
- The device interworks the SIP tgrp=hotline parameter
(received in INVITE) to ISDN Setup with the Off Hook
Indicator IE of “Voice”, and “Speech” Bearer Capability
IE. Note that the Off Hook Indicator IE is described in
UCR 2008 specifications.
- The device interworks the SIP tgrp=hotline-ccdata
parameter (received in INVITE) to ISDN Setup with an
Off Hook Indicator IE of “Data”, and with “Unrestricted
64k” Bearer Capability IE. The following is an example of
the INVITE with tgrp=hotline-ccdata:
INVITE sip:1234567;tgrp=hotline-ccdata;trunk-
context=dsn.mil@example.com
- 1176 -
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