External Modem Registry Key Sample
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:
| Registry Key | Type | Value | Remarks |
|---|---|---|---|
| TSP | Unimodem.dll | This value is redundant, because Unimodem is the component that processes the ExtModem keys. | |
| DeviceArrayIndex | DWORD | 1 | The Serial.dll library file uses these registry values when it loads for the port on which the external modem is connected. |
| Prefix | COM | ||
| DLL | Serial.dll | ||
| ResetDelay | DWORD | 800 |
The following 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]
Last updated on Friday, April 02, 2004
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