AudioCodes Mediant 500 E-SBC, User Manual

Page: 759 / 920

User's Manual 54. Configuration Parameters Reference
Version 6.8 759 Mediant 500 E-SBC
Parameter Description
EMS: Enable History Info
CLI: hist-info-hdr
[EnableHistoryInfo]

[1] Enable
User Agent Client (UAC) Behavior:

Initial request: The History-Info header is equal to the Request-URI.
If a PSTN Redirect number is received, it is added as an additional
History-Info header with an appropriate reason.

Upon receiving the final failure response, the device copies the
History-Info as is, adds the reason of the failure response to the last
entry, and concatenates a new destination to it (if an additional
request is sent). The order of the reasons is as follows:
a. Q.850 Reason
b. SIP Reason
c. SIP Response code

Upon receiving the final response (success or failure), the device
searches for a Redirect reason in the History-Info (i.e., 3xx/4xx SIP
reason). If found, it is passed to ISDN according to the following
table:
SIP Reason Code ISDN Redirecting Reason
302 - Moved Temporarily Call Forward Universal (CFU)
408 - Request Timeout Call Forward No Answer (CFNA)
480 - Temporarily Unavailable
487 - Request Terminated
486 - Busy Here Call Forward Busy (CFB)
600 - Busy Everywhere

If history reason is a Q.850 reason, it is translated to the SIP reason
(according to the SIP-ISDN tables) and then to ISDN Redirect
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.
Web: Use Tgrp Information
EMS: Use SIP Tgrp
CLI: use-tgrp-inf
[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 Hunt 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-