Virtual private switched telecommunications network
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United States of America Patent
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Apr 12, 2005
Grant Date -
Mar 3, 2005
app pub date -
Aug 27, 2003
filing date -
Aug 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method to provide secure communication across the untrusted public switched telephone network includes a set of rules in a security policy which are implemented by a virtual private switched telecommunications network (VPSTN). The VPSTN provides for intercepting voice calls and modifying their set-up to include a request for bearer capability to support a data call.
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