| Modem chipset | Disable K56Flex | Disable V.90 | Disable V.90 & K56Flex | Disable V.42bis | Show True Connect Speed |
| Lucent LT Winmodem | s38=0 | -v90=0 | s38=0-v90=0 | \n2 | W2 |
| Lucent Venus | s38=0 | s109=0 | s38=0s109=0 | \n2 | W2 |
| STMicroelectronics AMR | +MS=90,0 | +MS=56,0 | +MS=34 | %C1 | &E0 |
| Motorola SM56 (all models) | *mm15 | *mm13 | *mm12 | \n4 | \V2 |
| PCTel HSP (all models) | n0s37=14 | n0s37=13 | n0s37=12 | %C0 | W2 |
| Rockwell/Conexant ACF (driver ver 2.xx) | +MS=12,0 | +MS=56,0 | +MS=11 | &Q6 | W2 |
| Rockwell/Conexant ACF (1 MB ROM) | +MS=11 | +MS=11 | +MS=11 | &Q6 | W2 |
| Rockwell/Conexant HCF, ACF (driver ver 3.xx) & HSF(Soft56) | +MS=V90,0 | +MS=K56,0 | +MS=V34 | +ES=1,0,1; | at+mr=2 |
|
Modem chipset |
Disable x2 | Disable V.90 | Disable V.90 & x2 | Disable V.42bis | Show True Connect Speed |
| USR Sportster and Winmodem | S32=34 | S32=66(Sport) S32=64(Win) | S32=98 | S15=128 | &a3 |
| USR Courier | S58=1 | S58=32 | S58=33 | S27=32 | &a3 |
| Cirrus Logic 56XX | +MS=V90,0 | +MS=VX2,0 | +MS=V34 | "H0 | W2 |
| ESS Tech / Teledrive (x2/v90) | +MS=17,0 | +MS=12,0 | +MS=11 | \N5 | W2 |
| ESS Tech / Teledrive (v90 only) | Only v90/v34. No x2/flex fallback | +MS=11 | Only v90/v34. No x2/flex fallback | \N5 | W2 |
| Texas Instruments x2/v90 | S32=32 | S32=64 | S32=128 | &K0 | &B0 |
| Modem | Common Init Stings | Help for Dropped Connections |
| IBM MWave | AT"H%C\NS28=18 | N/A |
| Lucent LT | AT&FX-v90=1s38=0s28=1 | s10=200 |
| Lucent Venus | AT&Fs109=2 | s10=200
s25=100 |
| STMicroelectronics AMR | AT&F&C1&D2+MS=90,0,32000,48000 | s10=200 |
| Motorola SM56 | AT&F*mm15 | s10=200 |
| PCTel HSP | AT&F&C1&D2&K3W1 | s10=200
s25=100 s91=6 s91=14 |
| Rockwell/Conexant ACF | AT&F+MS=12 | s10=200
s25=100 s91=8 s91=14 s30=0 |
| Rockwell/Conexant HCF & HSF(Soft56) | AT&F&C1&D2+MS=v90,0 | s10=200 |
| Rockwell/Conexant Riptide AMR | N/A | s10=200 |
| USRobotics Winmodem | AT&FS13=64S32=34&K0 |
s10=200 AND/OR s25=100 |
| USRobotics Sportster (28.8 or x2 ONLY) | SPIRAL OF DEATH: AT&F1S15=128 OR AT&F1&K0S15=128 | s10=200 AND/OR s25=100 |
| USRobotics Courier | AT&F&C1&D2s58=1 | s10=150
s25=100 |
| Cirrus Logic 56XX | AT&F&C1&D2+MS=V90,0,0,48000 | s10=200
s25=100 s91=6 s91=14 |
| ESS Tech / Teledrive (x2/v90) | AT&F&C1&D2+MS=V90,0,33333,48000 | s10=200
s91=7 s91=14 |
| ESS Tech / Teledrive (v90 only) | AT&F&C1&D2+MS=V90,0,33333,48000 | s10=200
s91=7 s91=14 |
| Texas Instruments (x2/v90) | AT&F&C1&D2s32=32 | s10=200
s25=100 |
