Configuring Pre-Parsing Manipulation Rules - AudioCodes Mediant 4000 SBC User Manual

CHAPTER 21 SIP Message Manipulation
Parameter
'Method List'
method-list
[MessagePolicy_
MethodList]
'Method List Type'
method-list-type
[MessagePolicy_
MethodListType]
SIP Body Blacklist-Whitelist Policy
'Body List'
body-list
[MessagePolicy_BodyList]
'Body List Type'
body-list-type
[MessagePolicy_
BodyListType]
Malicious Signature
'Malicious Signature
Database'
signature-db-enable
[MessagePolicy_
UseMaliciousSignatureDB]

Configuring Pre-Parsing Manipulation Rules

The Pre-Parsing Manipulation Set table lets you configure up to 10 Pre-Parsing Manipulation Sets.
Pre-Parsing Manipulation allows you to manipulate incoming SIP messages (dialog-initiating and
in-dialog) before they are parsed (as an object) by the device. In other words, messages can be
manipulated in their original format (plain text) as received from the network. Pre- Parsing
Manipulation may be useful, for example, to overcome parser strictness or to "allow" possible
parsing errors.
To use a configured Pre-Parsing Manipulation Set, you need to assign it to a SIP Interface (see
Configuring SIP Interfaces
Classification Manipulation and Classification.
Pre- Parsing Manipulation rules are defined by the SIP message element to manipulate (for
example, INVITE), the pattern based on regular expression (regex) to search for (match) in the
incoming message, and the regex pattern to replace the matched pattern.
Defines SIP methods (e.g., INVITE\BYE) to blacklist or
whitelist.
Multiple methods are separated by a backslash (\). The method
values are case-insensitive.
Defines the policy (blacklist or whitelist) for the SIP methods
specified in the 'Method List' parameter (above).
■ [0] Policy Blacklist = The specified methods are rejected.
■ [1] Policy Whitelist = (Default) Only the specified methods
are allowed; the others are rejected.
Defines the SIP body type (i.e., value of the Content-Type
header) to blacklist or whitelist. For example, application/sdp.
The values of the parameter are case-sensitive.
Defines the policy (blacklist or whitelist) for the SIP body
specified in the 'Body List' parameter (above).
■ [0] Policy Blacklist =The specified SIP body is rejected.
■ [1] Policy Whitelist = (Default) Only the specified SIP body
is allowed; the others are rejected.
Enables the use of the Malicious Signature database (signature-
based detection).
■ [0] Disable (default)
■ [1] Enable
To configure Malicious Signatures, see
Signatures.
). The device performs Pre- Parsing Manipulation before Pre-
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Mediant 4000 SBC | User's Manual
Description
Configuring Malicious