| http://www.w3.org/ns/prov#value | - While only nine signals are listed (aside from silence, unknown and raw high energy), it is to be understood that many more types of signals can be defined and recognized by the call progress monitor algorithm according to the present invention, including Dual Tone Multiple Frequency (DTMF), Multiple Frequency (MF), facsimile machine and other special signals such as the coin bong tone used by p
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