Compaq 1750 Armada 1700 Family of Personal Computers Reference Guide - Page 85

S Register Command Summary Continued Register Description S89 Sleep Mode Timer. S90 Read-only Local Phone. Advanced Voice Commands Command S32 S33 Description Synthetic Ring Volume. Synthetic Ring Frequency. Audio Response Codes The modem alerts the DTE to the presence of tones detected on the phone line. During a voice call, the modem is capable of simultaneously detecting tones other than voice. When such a tone is detected, the modem responds via the communications interface with one of the following response codes: Code 0-9, A-D,#,* a b c d e h H R r s @ Audio Response Codes Description DTMF Tones Answer Tone Busy Tone Fax Calling Tone Dial Tone Data Calling Tone Local Phone On-Hook Local Phone Off-Hook Ring Ringback Silence Timer Has Expired CAS Tone Detected Using the Internal Modem 7-17