If your CS540 squeals or has static during a call that both you and your caller hear, try re-subscribing the base to the headset.
Manual Over-the-Air Subscription:
1) With your Plantronics CS540 idle and your headset undocked, press and hold the subscription button (Labeled 1) on
the base for three seconds. The Power on/subscription light will flash white.
2) Press and hold the volume up button on the CS540 headset for three seconds until the headset LED
turns solid white. When the Power on/subscription LED on the base becomes solid white, the
headset and base are subscribed to one another.
NOTE: If the subscription process times out after two minutes or if the subscription process
fails, the subscription LED on the base will go dark for three seconds and then re-illuminate
steadily to indicate power is applied to the base. If this occurs, try to re-subscribe the CS540 headset
again.
Ending Subscription:
If the Plantronics CS540 base is in subscription mode and you want to stop the base from searching for a headset,
press the subscription button again. The subscription LED on the base will go dark for three
seconds and then re-illuminate steadily to indicate power is applied to the base.
Power On/Subscription LED
| Base Status | Power On/Subscription LED |
| Primary headset subscription | Flashes white |
| Primary headset subscribed to base | Solid white |
| Conference call headset subscription | Flashes white |
| Active conference call with guest headsets | Flashes white |
Need more assistance:
Plantronics CS540 Setup/Installation
I am getting static, cutting in and out, feed back, and hearing my self when talking with a customer using the headset (Plantronics C054). The customer does not hear anything different, but I sure do!
Can you help with this issue
It sounds like it’s on the incorrect compatibility switch setting. Adjust the A-G on the bottom of the base until you can hear and callers can hear you.
I have a Plantronics CS540 headset. This is my second plantronics headset. it is wireless. I work at a school and my issue is is that sometimes when I make an overhead announcement using the headset, we have very loud squealing sound coming out of the system. Can you tell me if you know what might cause this problem. I tried looking into the issue online but see nothing that pertains to this problem.
Thanks for any help you can give,
Diane
It sounds like the microphone volume needs to be adjusted to a lower setting. On the bottom of the base you will find a picture of a mic with an orange turn dial numbered 1-6. Turn the dial down one number and see if that helps.