32-Bit TAPI Programs Cannot Select Installed Modem

• Microsoft Windows 95
• Microsoft Windows 98
• Microsoft Windows 98 Second Edition

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.

The following error message may appear after you attempt to dial a connection:

Error 633 The modem is not installed or configured for dial up networking. To check your modem configuration, double click on the modems icon in the Control Panel.

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 Windows 98 Second Edition, the Unimdm.tsp file is located in the Win98_69.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 win98 win98se
Version : WINDOWS:95
Platform : WINDOWS
Issue type : kbprb