Description of the Modem Settings Key in the Windows Registry (250649)


The information in this article applies to:

  • Microsoft Windows Millennium Edition
  • Microsoft Windows 98 Second Edition
  • Microsoft Windows 98
  • Microsoft Windows 95
This article was previously published under Q250649
If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware:

http://support.microsoft.com/default.aspx/w98?sid=460

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SUMMARY

This article describes the Modem Settings registry key in the Windows Me/98/95 Registry. This key is located in

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Modem\xxxx\Settings

MORE INFORMATION

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
The Settings key contains commands for configuring various modem settings. After the Init key commands are sent, Windows builds a dynamic configuration command string by concatenating various entries shown in the following table. The command depends on the settings selected in the modem's properties.

The following table describes the entries under the Settings registry key:

Subkey Description Example
Prefix Configuration command prefixAT
Terminator Configuration command suffix<cr>
DialPrefix Dial command prefixD
Dial_Pulse Use pulse dialingP
Dial_Tone Use tone dialingT
Blind_Off Detect dial tone before dialingX4
Blind_On Do not detect dial tone before dialingX3
CallSetupFailTimeout Specify call setup time-outS7=<#>
InactivityTimeout Specify inactivity time-outS30=<#>
SpeakerVolume_Low Low speaker volumeL1
SpeakerVolume_Med Medium speaker volumeL2
SpeakerVolume_High High speaker volumeL3
SpeakerMode_Off Speaker always offM0
SpeakerMode_Dial Speaker on during dial and negotiationM1
SpeakerMode_On Speaker always onM2
SpeakerMode_Setup Speaker on only during negotiationM3
FlowControl_Off No flow control&K0
FlowControl_Hard Hardware flow control&K1
FlowControl_Soft Software flow control&K2
ErrorControl_Off Error control disabled (normal mode, not direct)+Q6S36=3S48=128
ErrorControl_On Error control enabled (auto reliable)+Q5S36=7S48=7
ErrorControl_Forced Error control required to connect (reliable)+Q5S36=4S48=7
ErrorControl_Cellular Cellular protocol enabled\N3-K1)M1-Q1*H1
Compression_On Compression enabledS46=138
Compression_Off Compression disabledS46=136
Modulation_CCITT Use CCITT modulations for 300 and 1200 bpsB0
Modulation_Bell Use Bell modulations for 300 and 1200 bpsB1
SpeedNegotiation_Off Connect only at default modem speed; do not fall backN0
SpeedNegotiation_On Use lower DCE speed to connect, if necessaryN1
Modification Type:MajorLast Reviewed:8/8/2006
Keywords:kbHardware kbinfo KB250649
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