- Provides
4 DTMF receivers and 2 general-purpose tone receivers to detect
call progress tones, modem answer-back tones, transmission test
tones, and noise
- Provides
dial tone detection required for the Automatic Route Selection
(ARS) feature, off-premise keyboard dialing, and off-premise abbreviated
dialing
- Used
only in System 75 R1V3 XE and R1V4 applications where Mult-Frequency
(MF) generation/detection is not required
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