I have a Plantronics C610 headset. The caller can hear me, but I can not hear the caller.

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

try plugging in your headset ( male) wire to a different plug on the bottom or side of the phone.

There may be linking issues between the headset and the phone. Page 11 of the user guide offers these suggestions. Also, here is a link for re-pairing your headset to the phone:

Plantronics Explorer 230 Pairing Instructions

Remember that you want to purge any possible bluetooth interference from your phone.

"Callers cannot hear me or I cannot hear caller/dialing tone:
The headset is not turned on or the headset is not connected to mobile phone. Press the call control button for 2 seconds until you hear a beep or see the indicator light glow blue to turn headset on.
Your headset is out of range. Move the headset closer to the phone or Bluetooth device.
Your headset battery is drained. Charge your battery using the AC power adapter supplied.
The listening volume is too low. Press the volume key up (toward the earloop) to increase the sound heard in the headset."

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Make sure the Plantronics S11 headset is plugged into your handset jack on your phone, not the headset jack, this will make a difference on most phones. After plugging the S11 into the handset jack on your phone, you will need to pick up your handset receiver and sit it off to the side of the phone to place a call or to receive a call, after you are finished with your call sit the handset receiver back in the cradle on your phone.

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If you have the CS70 it has a replaceable voice tube. If this is dirty or clogged with food or sugary drinks, people will not be able to hear you. That can be replaced with another voice tube. If this is a noise-canceling microphone, it is non replaceable, they are not cleanable. On the base of the unit is a microphone adjustment, it might be something that needs to be turned up.

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Please see the link below for the User's Guide.

• Headset is muted. Long press (3 sec.) the volume down button on headset to unmute the microphone. See page 16.
• Improper positioning of voice tube. Try various other positions.
• Voice tube may be clogged. Remove voice tube and test to see if callers can hear you without it. If they can, then replace the clogged voice tube. See page 18.
• Speaking volume is too low. Increase the speaking volume by
adjusting the speaking volume minor adjust buttons on the base unit as described on page 16. If the volume is still too low, select another speaking volume major adjust setting as described on page 16.
• Incorrect configuration dial setting for your phone. Try other
phone configuration dial settings on the base unit. Ensure the
selected number is in line with the position indicator. See page 14.

Plantronics CS70 User's Guide

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You need to remember a couple of things when using amplifiers and headsets. Normally they will not work if you connect them to a phone with cordless accessories. Also, you need to make sure that you're connecting the amplifier to the HANDSET jack on the phone (this requires removing the handset off of the phone to access an open line). Give that a try and you should be fine. If not, contact your retailer or Plantronics at 800-544-4660 x5538 for warranty service.

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Make sure the Plantronics S11 is plugged into the handset jack on your phone and not the headset jack. This will make a difference.

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Remember that newer phones are like small computers, so they may become corrupt over time and you may need to reset them every so often. Simply turn your phone off and remove the battery for a few seconds, then replace the battery and turn it back on again. If this does not resolve the issue, delete any pairing information for your Explorer 330 headset and pair it again with your phone, carefully following the instructions on the link below for the Plantronics Explorer 330 User's Guide.

Plantronics Explorer 330

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see what TTY mode your phone is in. TTY mode is under call settings or go to voice command and say TTY mode. I keep mine off. This mode is for people who are deaf, and people who are hard of hearing and use hearing aids.