Version 5.2 79 September 2007
SIP User's Manual 5. Web-based Management
Table 5-8: General Parameters (Protocol Definition)
Parameter Description
Enable History-Info Header
[EnableHistoryInfo]
Enables usage of the History-Info header.
Valid options include:
 [0] Disable = Disable (default)
 [1] Enable = Enable
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 gateway
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:
- Q.850 Reason
- SIP Reason
- SIP Response code
 Upon receiving the final (success or failure) response, the
gateway 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
480 - Temporarily Unavailable
Call Forward No Answer (CFNA)
486 - Busy Here
600 - Busy Everywhere
Call Forward Busy (CFB)
 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.
UAS Behavior:
 History-Info is sent in the final response only.
 Upon receiving a request with History-Info, the UAS
checks the policy in the request. If 'session', 'header', or
'history' policy tag is found, the (final) response is sent
without History-Info. Otherwise, it is copied from the
request.
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