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If you are viewing that page, it seem that you have problems with isdnui.dll. The common errors you may find are typically like that:

Requested library is missing. Try re-install program to fix.isdnui.dll

The specified module could not be found

Error loading isdnui.dll

The program cant start because isdnui.dllis missing from your computer. Try reinstalling the program to fix this problem.

isdnui.dll is either not designed to run on Windows or it contains an error
To fix that, proceed to next section of this page.

Available versions of isdnui.dll

How to select appropriate DLL-file version? First, decide what Windows – 32 or 64 bits do you have. It is more likely to install version for special your bits. Second, choose latest version (they are on top). Install it, unpacking .zip file to program folder which requests DLL or C:/Windows/System32. If this doesn’t help, try another version or read our article about DLL installation.

Version:	File size:	ZIP Archive size:	Language:	Bits:
isdnui.dll 4.0.0.1150 Windows ISDN Properties	26.5 kb	12.5 kb	U.S. English	Windows 7/8/8.1/10 32bit	Download