Maintenance Agreement August 4, 1997 CONFIDENTIAL 37 3. There shall be fewer than 1 talkoff in 5 hours of voice when the detector is programmed with the recommended parameters. Assuming that each voice call is has an average of 2 seconds of voice, there shall be fewer than 1 talkoff in 9000 calls. A.5.3.1.9 Unknown Tone Any single tone, dual tone, amplitude modulated tone or single tone sequence that is not classified as a CP, SIT, CNG or modem ANS tone, shall be reported as an unknown tone. Performance Requirements: 1. Talkdown performance requirement [TBD] 2. There shall be fewer than 1 talkoff in 5 hours of voice when the detector is programmed with the recommended parameters (minimum tone duration 400 ms). Assuming that each voice call is has an average of 2 seconds of voice, there shall be fewer than 1 talkoff in 9000 calls. A.6 Multifrequency Tone Detection (MFD) The MFD algorithm module detects the presence of Rl, R2 Forward, and R2 Backward Multi frequency (MF) tones under a broad range of network conditions and under international telecommunications specifications. A.6.1 Functional requirements: Table A-10, Table A-11, and Table A-12 specify the nominal frequencies for the MF digits that must be detected. - ----------------------------------------------------------------------- F1 (Hz) F2 (Hz) 900 1100 1300 1500 1700 ------------------------------------------------------------- 700 1 2 4 7 Spare 900 -- 3 5 8 Spare 1100 -- -- 6 9 KP 1300 -- -- -- 0 Spare 1500 -- -- -- -- ST - ----------------------------------------------------------------------- Table A-10: Nominal MF R1 Frequencies and corresponding digit definitions Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 38 - ----------------------------------------------------------------------- F1 (Hz) F2 (Hz) 1500 1620 1740 1860 1980 ------------------------------------------------------------- 1380 1 2 4 7 11 1500 -- 3 5 8 12 1620 -- -- 6 9 13