Problem description:

In some cases it is necesary to restrict maximum fax speed for all faxes, for example if phone line has low quality. Drivers for Brooktrout TR114 cards, faxmodems and CAPI cards (vxfxcapi.exe from version 1.2.0) have this feature.

Solution:

Restriction is set via registry. Values below are located under HKLM\SOFTWARE\Datasys\Faxchange key, if not stated otherwise.

• For Brooktrout TR114:
  Set maximum sending speed for specific line into line#\brooktrout\maxbitrate value, where # is line number.

• For faxmodem:
  Set maximum sending speed into global\system\class2maxspeed value. This setting is valid for all lines driven by faxmodem driver.

• CAPI driver has wider features and works in this way (registry settings are under HKLM\SOFTWARE\Datasys\UMS\Drivers\Common key):
  • for INCOMING call:
    searches for MaxSpeed\RemoteNumber\<caller's number> item. If found, reads it and uses as fax receiving speed.
    If not found, searches for MaxSpeed\LocalNumber\<called number> item. If found, reads it and uses as fax receiving speed.
    If not found, reads MaxSpeed\Default item and uses as fax receiving speed. If item doesn't exist, 0 (zero) is used, i.e. automatic speed selection.
  • for OUTGOING call:
    searches for MaxSpeed\RemoteNumber\<called number> item. If found, reads it and uses as fax sending speed.
    If not found, reads MaxSpeed\Default item and uses as fax sending speed. If item doesn't exist, 0 (zero) is used, i.e. automatic speed selection.
  So value MaxSpeed\Default works like global fax sending/receiving speed through CAPI, if not specified otherwise.

Further information:

Restriction of maximum speed for individual addresses can be set in fax address properties dialog, "FaxChange Advanced" tab.

Keywords:

FaxChange,Brooktrout,TR 114,speed,rychlost,faxmodem,CAPI

If there is something unclear, send us an email to development@datasys.cz.