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 component frequencies deviate less than 1% from nominal. 2. Twist: The CP detector detects all tones whose twist is less than +/-4 dB. 3. Dynamic Range: The CP detector exhibits a minimum dynamic range of 25 dB. 4. Cadence: The CP detector must detect call progress tones whose cadence is within +/-10%. 5. Talkoff: The CP detector makes no false detections in 12 hours of testing with voice at -15 to -18 dBm ASL. A.5.3.1.6 FAX CNG Tone Detection The standard connection protocol for automatic connection of a FAX modem requires that the calling FAX modem generate a calling tone (CNG). Hence for incoming calls, the EVP software has to detect a CNG signal. When CNG is detected, EVP alerts the Core Processor to redirect the call to a FAX machine or a FAX modem embedded within the call processing system. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 34 Functional Requirements: Detect the presence of the FAX calling tone (CNG). A CNG signal is defined as follows. INSERT GRAPH Figure A-5: Fax calling tone (CNG) a) The CNG tone is within 38 Hz of nominal frequency. b) The timing tolerance of a CNG tone is +/-15%. c) The power of a CNG tone is between 0 and -43 dBm. Performance Requirements: 1. The detector does not miss any CNG signals on a prerecorded tape containing 50 CNG tone samples collected from S different FAX machines. 2. The detector does not miss any CNG signals from