32-Bit TAPI Programs Cannot Select Installed Modem

ID: Q150619

The information in this article applies to:

SYMPTOMS

A 32-bit TAPI program may not be able to access installed modems. Even though there is a modem installed, the program may start the Install New Modem Wizard, or may not allow you to select a modem.

For example, when you start the Make New Connection wizard in Dial-Up Networking, the Install New Modem wizard may start even though a modem is already installed.


CAUSE

This behavior can occur if the Unimodem TAPI Service Provider file (Unimdm.tsp) is missing or damaged.


RESOLUTION

Extract a new copy of the Unimdm.tsp file from your original Windows disks or CD-ROM to the Windows\System folder. For Windows 95, the Unimdm.tsp file is located in the Win95_03.cab cabinet file. For Windows 98, the Unimdm.tsp file is located in the Win98_63.cab cabinet file.

For information about using the Extract tool, type extract at a command prompt, or see the following article in the Microsoft Knowledge Base:

ARTICLE-ID: Q129605
TITLE : How to Extract Original Compressed Windows Files


MORE INFORMATION

Unimdm.tsp is the upper part of the layer of the communications sub- system that interfaces TAPI components to *VCOMM. In conjunction with Unimodem.vxd, this layer is responsible for placing calls made by telephony-aware programs. If Unimdm.tsp is not present, TAPI programs expecting to use a modem react as if one is not installed.

Additional query words: dun 


Keywords          : kbenv dun wintapi win95 
Version           : WINDOWS:95
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: February 20, 1999