User's Manual 67. Configuration Parameters Reference
Version 6.8 853 Mediant 500L MSBR
Parameter Description
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-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:
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)
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