How to Uninstall and then Reinstall a Modem

A common need of any telephony-based software is to have correctly installed modem drivers.

Software that records or plays back over a phone line additionally requires a voice/wave driver that is often installed separately to the modem driver. Sometimes this driver will be called a 'Multimedia device driver' but the exact naming varies from manufacturer to manufacturer.

Lastly, many of our programs require a TAPI driver to be installed. Many modems use the default one installed as part of Windows. CallURL for example use a separate TAPI driver.

Some common problems you can get here are:

If you are having problems with no playback or recording of audio in our software then the issue is a missing voice/wave driver.
If the program says no TAPI compliant devices are installed then the TAPI driver is not installed. Conversely, it can just be that your device is not a voice modem or is not fully TAPI compliant.

To try and correct these issues the first thing we will usually ask you to do is to uninstall your modem/telephony board driver and then re-install it.

Uninstall Driver

Open the Windows Control Panel, select Add/Remove Programs, and remove any listed program for your modem. Few modems or boards appear here.
Select Add/Remove Hardware and select Uninstall/Unplug a device. Select the modem on the next dialogue if it is present. Again, many modems do not appear here.
Select Phones and Modems from the Control Panel. Select the Modems Tab and select the modem. Click on the Remove button. Now select the Advanced tab and under Providers locate the TAPI driver specifically installed by your device. For example, CallURL hardware installs one called 'Talk Voice TAPI Service Provider'. DO NOT remove 'TAPI Kernal-Mode Service Provider' or 'Unimodem 5 Service Provider'.
shutdown you PC (power off).

Install Driver

For CallURL boards please follow these instructions:
https://www.nch.com.au/hardware/setup/telephony.html

For Dialogic boards please follow these instructions:
https://www.nch.com.au/ivm/dialogic.html

For modems in general

Ensure the device is installed and powered on. Insert the CD supplied by the manufacturer.
Reboot your PC.
Windows will detect the device and ask you for the driver. Follow the prompts and when asked tell it to browse your CD-ROM.
When it asks for a Multimedia device also select the driver from the CD-ROM.

If you do not have a CD-ROM you will need to browse to the location on your hard-drive where the driver is located.