Trouble shooting a Plantronics-CS540 Wireless Dect Headset

Modified on Tue, 15 Apr at 2:23 PM

For the headset base:

There are two small knobs—one for Speaker Volume and one for Microphone Adjustment.
There is also a switch labeled A–G. Most phones work with setting A, but if you're not hearing a dial tone, slowly cycle through the options from A to G until a dial tone is heard.

For the Yealink phone:

When the phone is idle, press Menu > Basic, then scroll down to Analog Headset Mode.
The setting should be Common. If that doesn’t work, try options 2, 3, and 4 one at a time.