(Source)

Aztech Modem Checklist

Model

Chipset

Disable 56k String

EM3850 (External) Conexant/Rockwell ACF (hardware) AT+MS=11,0
MDP3858 Conexant/Rockwell HCF (software) AT+MS=V34,0
MDP3880 Conexant/Rockwell HCF (software) AT+MS=V34,0
MSP3880 Conexant/Rockwell HSF (software) AT+MS=V34,0
MDP3900 Conexant HCF (software) AT+MS=V34,0
EM6800 Texas Instruments (hardware) S32=98
EM6802 Texas Instruments (hardware) S32=98
MDP7800 Lucent Mars (software) S38=0-V90=0

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