A system and method to discriminate call content type

Details A system and method to discriminate call content type A system and method to discriminate call content type

H - Electricity

04

M

H04M 1/66 (2006.01) H04L 12/22 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2308808

A system and method for discriminating call content types for individual telephone lines at a plurality of user sites outside of a Public Switched Telephone Network (PSTN) is described. The system may include: a database containing security rules for each of a plurality of extensions, the rules specifying actions to be taken based upon a call content type of the call on the extension, wherein the call content type is determined at the user sites outside the PSTN; and a line sensor within the user sites outside the PSTN for determining the call content type of the call. The line sensor continuously checks the call content type to determine if the call content type changes. For example, the first call content type can be fax and the second call content type can be data. An implementation of the system and method uses filtered tonal events as well as raw signal frequency and energy indices to discriminate between voice and voice band data content. Further discrimination between voice and a plurality of voice band data content types (fax, data modem and STU-III), is provided by a content type discrimination state machine which uses tonal event notices, the output of the previously mentioned frequency and energy statistical analysis between voice and voice band data, and demodulated signal analysis.

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