AudioCodes Mediant 800 MSBG User Manual page 704

Parameter
Web: Enable History-Info
Header
EMS: Enable History Info
[EnableHistoryInfo]
Web: Tel2IP Default
Redirect Reason
[Tel2IPDefaultRedirectRe
ason]
SIP User's Manual
Enables usage of the History-Info header.
[0] Disable (default)
[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
302 - Moved Temporarily
408 - Request Timeout
480 - Temporarily Unavailable
487 - Request Terminated
486 - Busy Here
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.
Default redirect reason for Tel-to-IP calls when no redirect reason (or
"unknown") exists in the received Q931 ISDN Setup message. The
device includes this default redirect reason in the SIP History-Info
header of the outgoing INVITE.
If a redirect reason exists in the received Setup message, this
parameter is ignored and the device sends the INVITE message with
the reason according to the received Setup message. If this parameter
is not configured (-1), the outgoing INVITE is sent with the redirect
reason as received in the Setup message (if none or "unknown" reason,
then without a reason).
[-1] Not Configured (default) = Received redirect reason is not
changed
[1] Busy = Call forwarding busy
704
Mediant 800 MSBG
Description
ISDN Redirecting Reason
Call Forward Universal (CFU)
Call Forward No Answer (CFNA)
Call Forward Busy (CFB)
Document #: LTRT-12804