Version 7.2 1073 Mediant 1000B Gateway & E-SBC
User's Manual 65. Configuration Parameters Reference
Parameter Description
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. The 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-
(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
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 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)
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