User's Manual 556 Document #: LTRT-10466
Mediant 500L MSBR
Note:
• For security, it is recommended to classify SIP dialogs based on Proxy Set only if
the IP address of the Server-type IP Group is unknown. In other words, if the
Proxy Set associated with the IP Group is configured with an FQDN. In such
cases, the device classifies incoming SIP dialogs to the IP Group based on the
DNS-resolved IP address. If the IP address is known, it is recommended to use a
Classification rule instead (and disable the Classify by Proxy Set feature), where
the rule is configured with not only the IP address, but also with SIP message
characteristics to increase the strictness of the classification process. The reason
for preferring classification based on Proxy Set when the IP address is unknown is
that IP address forgery (commonly known as IP spoofing) is more difficult than
malicious SIP message tampering and therefore, using a Classification rule
without an IP address offers a weaker form of security. When classification is
based on Proxy Set, the Classification table for the specific IP Group is ignored.
• If multiple IP Groups are associated with the same Proxy Set, use Classification
rules to classify the incoming dialogs to the IP Groups (do not use the Classify by
Proxy Set feature).
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