tones can safely overlap the other tone ranges without causing tones to be misclassified. If the range for Unknown tones is allowed to be the maximum range allowed by the detector, any detected tone that is unclassified would be designated as Unknown. A.5.3.1.5 North American Call Progress Signal Detection Functional Requirements: The tables below specify the frequencies, power levels, and cadence of the Bellcore and EIA-464A call progress tones. - -------------------------------------------------------------------------------- Frequency (Hz) Power Level (dBm) - -------------------------------------------------------------------------------- Name 350 440 480 620 Per Frequency Combined - -------------------------------------------------------------------------------- Audible Ring X X -22.5 +/- 1.5 - -------------------------------------------------------------------------------- Busy X X -27 +/- 1.5 - -------------------------------------------------------------------------------- Dial Tone X X -17.5 to -15 -13 to -14.5 - -------------------------------------------------------------------------------- Intercept X X -20 +/- 1.5 - -------------------------------------------------------------------------------- Reorder X X -27 +/- 1.5 - -------------------------------------------------------------------------------- Table A-7: Call Progress Tone Frequency and Power Requirements Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 33 - ------------------------------------------------------------------------------- Audible ring (ring- repetition of the tone on for 0.8 to 2.2 seconds, and back) off for 2.7 to 4.4 seconds - ------------------------------------------------------------------------------- Busy repetition of the tone on for 0.5+/-0.05 seconds, and off for 0.5 +/-0.05 seconds - ------------------------------------------------------------------------------- Dial steady uninterrupted - ------------------------------------------------------------------------------- Intercept repetition of an alternating sequence, of the two frequencies each being on for 0.16 to 0.30 seconds with a total cycle time of 0.5 +/-0.05 seconds - ------------------------------------------------------------------------------- Reorder (fast busy) repetition of the tone on for 0.25+/-0.025 seconds, and off for 0.25+/-0.025 seconds - ------------------------------------------------------------------------------- Table A-8: Call Progress Tone Cadence Performance Requirements: 1. Frequency Deviation: Even though the generator is required to meet a frequency tolerance per tone of +/-0.5%, the detector needs to allow for a wider frequency tolerance due to variations in generators and line distortions. The CP detector detects all tones whose