How to connect to Plantroncis CS540 headset

I can hear the caller but they can not hear me...what is the solution?

You don't specify which headset that you have. I would need to know which one and check all the connections to know why you aren't hearing a dial tone.

Here are a few things you can try -- try checking all the connections, unplug and replug back in, make sure that they are in the correct slot.

If it is a wireless headset say like a CS50-CS55 there is a 1-4 on the side, check to see if the #1 is in a 3 O'Clock position.

Is this a computer headset, wireless, corded, bluetooth, MP3?? Can only give recommendations of things to try.

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The CS70 headset is definitely paired up to the base and has a good connection if the lifter raises up, sounds like maybe the compatibility setting may need adjusting. The number one should be in the three O'clock position, the compatibility setting is on the left side of the base unit. Here is a link below for the user guide if you need help with the adjustment.

Plantronics CS70 User's Guide

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Unfortunately, the phone does matter. The S12 is designed to work with office style phones where the handset is just the mouthpiece, all other features located on the base. My suggestion is to get a phone of that style (you can find inexpensive ones at Wally world) and connect the headset following the instructions on this link for the Plantronics S12.

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i don't own one

Two things to remember. If you're connected through the handset jack, the handset (receiver) needs to be lifted off the phone to get a dial tone. Secondly, if you're connected through the headset jack, you may need to adjust the configuration dial (round dial on left-hand side of base) to make it work when the headset button on phone is pushed.

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The Plantronics S11 headset system is meant to plug into the handset jack on your phone not the headset jack. Check the connection on the S11 to make sure the handset jack is where it is plugged into at.

Here are a few suggestions from Plantronics if you are not getting a dial tone:

Make sure all cable connections are correct and firmly in place.

Pay special attention that handset cord is properly connected.

Ensure AC power adapter is connected and power is on.
Make sure you have pressed the headset button and the headset indicator is on.

Make sure the telephone handset is off-hook.

Adjust listen volume control.

Adjust the compatibility slide switch.

Ensure that the headset is centered on your ear.

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The Plantronics 500A base should be plugged into the handset receiver jack on the phone, not the headset jack. It could be that the headset needs to be re-paired to the base unit, or the lifter is worn out (if using one). If you manually remove the handset receiver from the phone, and you power on and activate the headset, does sound come through ? If so, it may be the lifter. Here is a link for the 510S / 500A user guide to troubleshoot, and also a link for the pairing instructions.

Plantronics Voyager 510S User's Guide

Plantronics Voyager 510S Pairing Guide

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Perform a reset on the headset.  Hold down the mute button (the dial on the back of the headset needs to be pushed straight in), and at the same time hold down the call answer button until you see the green light on the headset blink a few times.  Release both the mute button and the call answer button.  See if it works now.  If it doesn't, try a re-subscription (should be available in the manual).