Sip Header Manipulation - AudioCodes Mediant 3000 User Manual

Below is an example of a call flow and consequent SIP URI manipulations:
The SIP message manipulations in the example above (contributing to typical topology
hiding) are as follows:
SIP Manipulation
Inbound Source SIP URI User Name
Source IP Group Name (SIP URI Host Name)
Inbound Destination SIP URI User Name
Destination IP Group Name (SIP URI Host
Name)

19.1.2.5 SIP Header Manipulation

The device provides enhanced SIP header manipulation, including insertion, removal,
and/or modification of SIP headers and parameters. This manipulation is configured in the
Message Manipulations table (MessageManipulations parameter). This feature enables the
normalization of SIP messaging fields between communicating network segments. For
example, it allows service providers to design their own policies on the SIP messaging
fields that must be present before a SIP call enters their network. Similarly, enterprises and
small businesses may have policies for the information that can enter or leave their
networks for policy or security reasons from a service provider. The manipulations can also
be implemented to resolve incompatibilities between SIP devices inside the enterprise
network.
SIP Messaging manipulation supports the following:

Addition of new headers.

Removal of headers ("Black list").

Modification of header components - value, header value (e.g., URI value of the P-
Asserted-Identity header can be copied to the From header), call's parameter values.

Deletion of SIP body (e.g., if a message body isn't supported at the destination
network this body is removed).

Translating one SIP response code to another.

Topology hiding (generally present in SIP headers such as Via, Record Route, Route
and Service-Route).
SIP User's Manual
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7000
10.2.2.6
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Document #: LTRT-89712