AudioCodes Mediant 3000 User Manual page 902

Parameter
User's Manual
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, 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-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
902
Description
Document #: LTRT-89730
Mediant 3000