US Robotics 56K USB Modem User Manual page 112

Range: 6—25 (corresponding to –6 dBm to –25 dBm transmit level)
• Default: 10 (–10 dBm transmit level)
• Units: –dBm
S127—Caller ID Impedance Activation
Register S127 invokes the Caller ID impedance specifications for a particular country.
Range: 0 = North America; 1 = Japan; 2 = UK; 4 = France; 7 = Taiwan (FSK + DTMF); 8 = DTMF
• Default: Set according to country code.
• Units: NA.
56K USB Modem
User Guide
Command Reference - 106