Note: If there is no Wave device under the Recording Volume control, then the sound card or the sound card drivers may not support full-duplex operation.

1. On your screen, locate and click the Start button.
From the Start menu, point to Settings, then click Control Panel.
In Control Panel, double-click the System icon.

2. In the System Properties dialog box, click the Device Manager tab.
In the list of devices, double-click Sound, video and game controllers.

3. Verify the sound card configuration is one that is using 2 different DMA resources.

4. In the System Properties dialog box, click the Close button.

5. In Control Panel, double-click the Multimedia icon.

6. In the Multimedia Properties dialog box, click the Audio tab.
Verify that both the Preferred Playback Device and the Preferred Record Device are set the same.

Note: Sound card 6000042 should be set as SB16 Wave Out(220) for the Preferred Playback Device, and SB16 Wave In(220) for the Preferred Record Device.

Sound cards 6000566 and 6000708 should be set as AudioPCI Wave Out for the Preferred Playback Device, and AudioPCI Wave In for the Preferred Record Device.

7. In the Multimedia Properties dialog box, click OK.

8. On your screen, locate and click the Start button.
From the Start menu, point to Programs, Accessories, Multimedia, then Sound Recorder.
Repeat this step to open a second instance of Sound Recorder.
Move the second instance of Sound Recorder from so you can see both at the same time.

9. In the first Sound Recorder, from the File menu, click Open.
Browse to C:\Windows\Media and select a wave file such as Jungle Windows Start.
In the second Sound Recorder, click the record button, then click the play button in the first Sound Recorder.

If you receive a message stating the device is already in use, go back and verify the sound card configuration.
You must have two DMA's available under the sound card resources.
When the wave is done playing, click the stop button, then the rewind button in the second Sound Recorder.
Click the play button.
If you do not hear the wave file play, go back and verify Wave is selected as a recording source in the Volume Control, and that the volume slide level for Wave is at least mid-point.

• 486/50 megahertz (MHz)
• Full-duplex sound card or two standard sound cards
• A Winsock+14.4 connection with correct settings to enable full-duplex communication
• Windows 3.x or later

Have a half-duplex sound card.

You can use a half-duplex sound card.

However, both sides can not cannot speak at the same time.

To speak, you click the microphone icon on the keypad and release it while you listen, just like using a walkie-talkie.

One party has to wait till the other party stops talking.

We recommend a full-duplex card. Both sides will be able to talk at once, just like on a telephone.

I know I have a full-duplex sound card, but Dialpad.com keeps saying that I have a half-duplex card.

The original Windows driver only supported half-duplex cards.

You can update your sound card's driver files.

This is usually free at your sound card manufacturer's web site.

Visit their web site and search for the driver update page.