Filter
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6 • Overview
[ S N O M 4 S N A T F I L T E R ]
1.1 Applications
The filter can be used in the following scenarios:
• Corporations. Corporations which operate their infrastructure be
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hind NAT and/or firewalls can talk to the public Internet through the
filter.
• Operators. Operators offer the NAT traversal feature to their cus
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tomers. Using the scalability feature of the filter, the operation of
large networks becomes possible.
• Record specific calls for legal purposes. In many countries, opera
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tors must provide the possibility to record certain calls on request.
The filter can perform this task.
• Recording can be used for legal proofing (brokers, etc). The filter is
fully compliant with other SIP equipment and can, for example, put
between a PSTN gateway and SIP phones.
1.2 Features
The filter offers powerful features based on modern VoIP technol-
ogy:
• The built-in RFC3261-compliant SIP proxy makes additional exter
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nal SIP logic superfluous and simplifies the system setup.
• A built-in RFC3489-compatible STUN server for single IP addresses
allows clients to self-refresh their bindings
• Support for instant messaging, presence and all other SIP-compli
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ant applications.
• Rich logging features allow easy maintenance.
• Recording functions based on number lists and expressions offer a
flexible way of filtering out information.
• Recordings can be saved in WAV file format (the data rate is 6 MB
per hour).
• Almost stateless operation allows the filter to be used in server
farms. This offers a tremendous scalability and redundancy making
the product suitable for large operators.
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