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.
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