External Modem Registry Key Sample
A version of this page is also available for
4/8/2010
A default registry entry always exists for a Hayes-compatible modem that is connected to COM1. You can specify additional external modems under the HKEY_LOCAL_MACHINE\ExtModems key. Most of the values that are set for PCMCIA modems also apply to external modems, except that the following values are ignored for external modems.
| Value : type | Default | Description |
|---|---|---|
TSP |
Unimodem.dll |
This value is redundant because Unimodem processes the ExtModem keys. |
DeviceArrayIndex : REG_DWORD |
1 |
The Serial.dll file uses these registry values when it loads for the port on which the external modem is connected. |
Prefix |
COM |
|
DLL |
Serial.dll |
|
ResetDelay : REG_DWORD |
800 |
|
The following code example of registry entries will cause TAPI 2.0 to create a line device for the external modem from CompanyX and present it as one of the available TAPI devices. In this minimal example, all of the default settings from the HKEY_LOCAL_MACHINE\Driver\Unimodem\Init and \Settings keys will be used.
[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem]
"Port"="COM1:"
"DeviceType"=dword:1
"FriendlyName"="CompanyX External Modem"
[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem\Init]
[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem\Settings]