Version 6.4 603 March 2012
SIP User's Manual A. Configuration Parameters Reference
Parameter Description
[3] Hotline = Interworks the hotline "Off Hook Indicator" parameter
between SIP and ISDN:
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
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 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 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.
Web/EMS: TGRP Routing
Precedence
[TGRProutingPrecedence]
Determines the precedence method for routing IP-to-Tel calls -
according to the Inbound IP Routing Table or according to the SIP
'tgrp' parameter.
[0] (default) = IP-to-Tel routing is determined by the Inbound IP
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
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