32-Bit TAPI Programs May Not Be Able to Access Your Installed Modem (150619)
The information in this article applies to:
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows 98 Second Edition
This article was previously published under Q150619
If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware: SYMPTOMS
A 32-bit Telephony API (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.
After you attempt to dial a connection, You may receive the following error message:
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.
NOTE: To more effectively search the Microsoft Knowledge Base, use keywords that relate to your issue. If you are searching for troubleshooting information that is not mentioned in this article, search the Microsoft Knowledge Base again by using keywords that are listed in the following Microsoft Knowledge Base article: 242450 How to Query the Microsoft Knowledge Base Using Keywords CAUSE
This behavior can occur if the Unimodem TAPI Service Provider file
(Unimdm.tsp) is missing or damaged.
RESOLUTION
To resolve this behavior, extract a new copy of the Unimdm.tsp file from your original Windows floppy 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 view the following article in the Microsoft Knowledge Base:
129605 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 that
expect to use a modem react as if a modem is not installed.
| Modification Type: | Major | Last Reviewed: | 8/8/2006 |
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| Keywords: | kbDialUp kbenv kbprb KB150619 |
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