Microsoft KB Archive/108306

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dwBearerModes and dwMaxRate in LINEDEVCAPS


The information in this article applies to:

  • Microsoft Windows Telephony Software Development Kit (SDK), version 1.0
  • Microsoft Win32 Software Development Kit (SDK), version 4.0, on platform(s):
    • the operating system: Microsoft Windows 95
  • Microsoft Win32 Software Development Kit (SDK) for Windows NT, version 4.0


A Windows Telephony application queries the service provider for device capabilities via a call to lineGetDevCaps. The dwMaxRate member of the LINEDEVCAPS structure indicates the digital data transmission rate of the bearer mode. This field is intended to indicate the maximum data rate for bearer modes that directly support DATA transmissions, such as LINEBEARERMODE_DATA or LINEBEARERMODE_ALTSPEECHDATA.

If the service provider does not support a DATA bearer mode, it can set dwMaxRate to 0 (zero) or use this field to indicate the maximum rate of data supported for other bearer modes that it does support. For example, if LINEBEARERMODE_VOICE is supported by a service provider that also supports LINEMEDIAMODE_DATAMODEM, dwMaxRate could indicate the maximum modem baud rate available for the line. However, if both DATAMODEM and DATA are available on the same line (for example, an ISDN adapter with a digital modem), then dwMaxRate would indicate the maximum LINEBEARERMODE_DATA rate.

Additional query words: 1.00 4.00 TAPI

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Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch kbWinSDKSearch

Last Reviewed: December 7, 2000
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