
| Register | Range | Units | Default | Function | 
| S25 | s or 0.01s | 5 | Delay to DTR Off | |
| S26 | 0.01s | 1 | ||
| S27 | - | - | 73(49h) | General Bit Mapped Options Status | 
| S28 | - | - | 0 | General Bit Mapped Options Status | 
| S29 | 10ms | 70 | Flash Dial Modifier Time | |
| S30 | 10s | 0 | Disconnect Inactivity Timer | |
| S31 | - | - | 194(C2h) | General Bit Mapped Options Status | 
| S32 | ASCII | 17(11h) | XON Character | |
| S33 | 
 | ASCII | 19(13h) | XOFF Character | 
| - | - | - | Reserved | |
| S36 | - | - | 7 | LAPM Failure Control | 
| S37 | - | - | 0 | Line Connection Speed | 
| S38 | s | 20 | Delay Before Forced  | |
| S39 | - | - | 3 | Flow Control Bit Mapped Options | 
| 
 | 
 | 
 | 
 | Status | 
| S40 | - | - | 168(a8h) | General Bit Mapped Options Status | 
| S41 | - | - | 195(C3h) | General Bit Mapped Options Status | 
| - | - | - | Reserved | |
| S46 | - | - | 138 | Data Compression Control | 
| S48 | - | - | 7 | V.42 Negotiation Control | 
| S82 | - | - | 128(40h) | LAPM Break Control | 
| S86 | - | - | Call Failure Reason Code | |
| S91 | dBm | 10(country | PSTN Transmit Attenuation Level | |
| 
 | 
 | 
 | dependent) | 
 | 
| S92 | dBm | 10(country | Fax Transmit Attenuation Level | |
| 
 | 
 | 
 | dependent) | 
 | 
| S95 | - | - | 0 | Result Code Messages Control | 
♦ Register value may be stored in one of two user profiles with the &W command.
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