Local Handling Of Sip 3Xx; Interworking Sip Diversion And History-Info Headers - AudioCodes Mediant 3000 User Manual

28.8.1.2 Local Handling of SIP 3xx

The device can handle SIP 3xx responses on behalf of the dialog-initiating UA and retry the
request (e.g., INVITE) using one or more alternative URIs included in the 3xx response.
The new request includes SIP headers from the initial request such as Diversion, History-
Info, P-Asserted-Id, and Priority. The source and destination URIs can be manipulated
using the regular manipulation mechanism.
The device sends the new request to the alternative destination according to the IP-to-IP
Routing table rules. (where the 'Call Trigger' field is set to 3xx). It is also possible to specify
the IP Group that sent the 3xx request as matching criteria for the re-routing rule in this
table ('ReRoute IP Group ID' field).

28.8.2 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.
This feature is configured in the IP Profile table (IPProfile parameter) using the following
new parameters:

SBCDiversionMode - defines the device's handling of the Diversion header

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:
Parameter Value
HistoryInfoMode = Add
DiversionMode =
Remove
HistoryInfoMode =
Remove
DiversionMode = Add
HistoryInfoMode =
Disable
DiversionMode = Add
HistoryInfoMode =
Disable
DiversionMode = Add
HistoryInfoMode = Add
DiversionMode = Add
User's Manual
Handling of SIP Diversion and History-Info Headers
SIP Header Present in Received SIP Message
Diversion
Diversion
converted to
History-Info.
Diversion
removed.
Not present.
Diversion
converted to
History-Info.
Not present.
Diversion
converted to
History-Info.
History-Info Diversion and History-Info
Not present Diversion removed.
History-Info History-Info added to Diversion.
converted to
History-Info removed.
Diversion.
History-Info
removed.
Not present. Diversion added to History-Info.
History-Info History-Info added to Diversion.
converted to
Diversion.
History-Info Headers are synced and sent.
converted to
Diversion.
422
Mediant 3000
Document #: LTRT-89729