SIP User's Manual
76
Document #: LTRT-65409
MediaPack
Series
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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