Version 6.2 705 February 2011
SIP User's Manual 12. Configuration Parameters Reference
Parameter Description
[2] No Reply = Call forwarding no reply
[9] DTE Out of Order = Call forwarding DTE out of order
[10] Deflection = Call deflection
[15] Systematic/Unconditional = Call forward unconditional
Web: Use Tgrp Information
EMS: Use SIP Tgrp
[UseSIPTgrp]
Determines whether the SIP 'tgrp' parameter is used. This SIP
parameter specifies the Hunt Group to which the call belongs (according
to RFC 4904). For example, the SIP message below indicates that the
call belongs to Hunt 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 Hunt Group number is added to the 'tgrp'
parameter value in the Contact header of outgoing SIP messages. If
a Hunt Group number 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 in option 1. In addition, for
incoming SIP INVITEs, 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
Hunt Group ID where incoming calls from Tel is received. For IP-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 Hunt Group ID used for outgoing
Tel calls. The <gateway IP address> in “trunk-context” can be
configured using the parameter SIPGatewayName.
[3] Hotline = Interworks the hotline "Off Hook Indicator" parameter
between SIP and ISDN:
9 For 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
9 For 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
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