AudioCodes Mediant 500L User Manual page 1077

User's Manual
Parameter
Use Tgrp Information
configure voip > sip-
definition settings > use-
tgrp-inf
[UseSIPTgrp]
Version 7.2
reason according to the table above.
User Agent Server (UAS) Behavior:

The History-Info header is sent only in the final response.

Upon receiving a request with History-Info, the UAS checks the
policy in the request. If a 'session', 'header', or 'history' policy tag is
found, the (final) response is sent without History-Info; otherwise, it
is copied from the request.
Enables the use of the SIP 'tgrp' parameter. This parameter specifies
the Trunk Group to which the call belongs (according to RFC 4904).
For example, the SIP message below indicates that the call belongs to
Trunk 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 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 (IP-to-Tel), 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-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.

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

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-
1077
69. Configuration Parameters Reference
Description
Mediant 500L Gateway & E-SBC