SIP User's Manual 488 Document #: LTRT-12804
Mediant 800 MSBG
Below is an example of a call flow and consequent SIP URI manipulations:
Figure 8-51: SIP INVITE (Manipulations) from LAN to WAN
The SIP message manipulations in the example above (contributing to typical topology
hiding) are as follows:
SIP Manipulation From To
Inbound Source SIP URI User Name 7000 97000 (blue)
Source IP Group Name (SIP URI Host Name) 10.2.2.6 IP_PBX (blue)
Inbound Destination SIP URI User Name 1000 9721000 (red)
Destination IP Group Name (SIP URI Host
Name)
10.2.2.3 ITSP (red)
8.4.3.5 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).
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