Interworking Sip Diversion And History-Info Headers - AudioCodes Mediant 4000 SBC User Manual

CHAPTER 22 SBC Overview

Interworking SIP Diversion and History-Info Headers

This device can be configured to interwork between the SIP Diversion and History-Info headers.
This is important, for example, to networks that support the Diversion header but not the History-
Info header, or vice versa. Therefore, mapping between these headers is crucial for preserving the
information in the SIP dialog regarding how and why (e.g., call redirection) the call arrived at a
certain SIP UA. If the Diversion header is used, you can specify the URI type (e.g., "tel:") to use in
the header, using the SBCDiversionUriType parameter.
This feature is configured in the IP Profiles table using the following parameters:
■ 'Diversion Header Mode' (IPProfile_SBCDiversionMode) - defines the device's handling of the
Diversion header
■ 'History-Info Header Mode' (IPProfile_SBCHistoryInfoMode - defines the device's handling of
the History-Info header
The handling of the SIP Diversion and History-Info headers is described in the table below:
Table 22-1: Handling of SIP Diversion and History-Info Headers
Parameter
Value
'Diversion
Header Mode'
= Add
'History-Info
Header Mode'
= Add
'Diversion
Header Mode'
= Add
'History-Info
Header Mode'
= Add
'Diversion
Header Mode'
= Add
'History-Info
Header Mode'
= Add
'Diversion
Header Mode'
= *
'History-Info
Header Mode'
= *
SIP Header Present
in incoming SIP
Message
Diversion History-
Info
Not Present
present
Present Not
present
Present Present
Not Not
present present
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Mediant 4000 SBC | User's Manual
Device Action
Diversion added from
History-Info
History-Info added from
Diversion
Diversion replaced and
added from History-Info
History-Info replaced and
added from Diversion
As no headers are present
on incoming message,
nothing is added
IP Header Present
in outgoing SIP
Message
Diversion History-
Info
Present Present
Present Present
Present Present
Not Not
present present