AudioCodes Mediant 3000, User Manual

Page: 706 / 872

User's Manual 706 Document #: LTRT-89729
Mediant 3000
Parameter Description
Web: Use Tgrp
Information
EMS: Use SIP Tgrp
[UseSIPTgrp]
Determines whether the SIP 'tgrp' parameter is used. This SIP
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) 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