User's Manual
262
Document #: LTRT-10437
Mediant 500 E-SBC
Parameter
Description
Classification Failure
Response Type
CLI:
classification_fail_response_ty
pe
[SIPInterface_Classification
FailureResponseType]
Defines the SIP response code that the device sends if a received
SIP request (OPTIONS, REGISTER, or INVITE) has failed the SBC
Classification process.
The valid value can be a SIP response code from 400 through 699,
or it can be set to 0 to not send any response at all. The default
response code is 500 (Server Internal Error).
This feature is important for preventing Denial of Service (DoS)
attacks, typically initiated from the WAN. Malicious attackers can use
SIP scanners to detect ports used by SIP devices. These scanners
scan devices by sending UDP packets containing a SIP request to a
range of specified IP addresses, listing those that return a valid SIP
response. Once the scanner finds a device that supports SIP, it
extracts information from the response and identifies the type of
device (IP address and name) and can execute DoS attacks. A way
to defend the device against such attacks is to not send a SIP reject
response to these unclassified "calls" so that the attacker assumes
that no device exists at such an IP address and port.
Note:
This parameter is applicable only if the device is set to reject
unclassified calls. This is configured using the 'Unclassified Calls'
parameter on the General Settings page (Configuration tab > VoIP
menu > SBC > General Settings).
Web: Pre Classification
ManSet
CLI: preclassification-manset
[SIPInterface_PreClassificati
onManipulationSet]
Assigns a Message Manipulation Set ID to the SIP Interface. This
lets you apply SIP message manipulation rules on incoming SIP
initiating-dialog request messages (not in-dialog), received on this
SIP Interface, prior to the Classification process.
By default, no Message Manipulation Set ID is defined.
For configuring Message Manipulation Sets, see Configuring SIP
Message Manipulation on page
Notes:
The Message Manipulation Set assigned to a SIP Interface that is
associated with an outgoing call, is ignored. Only the Message
Manipulation Set assigned to the associated IP Group is applied
to the outgoing call.
If both the SIP Interface and IP Group associated with the
incoming call are assigned a Message Manipulation Set, the one
assigned to the SIP Interface is applied first.
This parameter is applicable only to SBC calls.
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