D-Link DPH-50U Quick User Manual page 41

and then select Sound Devices as shown below.
Check the Audio In and Audio Out list boxes and make sure D-Link Virtual
Audio device is selected.
Q6. Call Forwarding is not working properly
• Make sure that a telephone cable is plugged into the DPH-50U line
jack and to the wall phone plug
• Try to dial the telephone number as you have entered in the DPH-50U
Call Forwarding dialog box
• If you are on a PBX, make sure you have entered enough commas
after the 9 (for example) to make sure that DPH-50U waits for the dial
tone before dialing the telephone number