Question about Plantronics CS55 Wireless Headset

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Outside caller hears themselves in an echo

Our business deploys several Plantronics cs55 model headsets, recently we upgraded our nortell phone system to Cisco. We are using the Cisco 7941 model phone with the headsets, A majority of them are working with out issue, but there are a few complaints that when a call comes in and it is answered on the plantronics cs55 headset, the calling party hears themselves as an echo, it usually corrects itself within 30 seconds but is extreamly unprofressional and frustrating for the users. I have tested every possible levels setting on the headset both speaker volume as well as reciever and have not been able to resolve this issue, any suggestions would be appreciated

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Echo is usually caused by the transmit (speak) level on the unit being set too high.

1. First, try lowering the volume of the telephone. If you still hear an echo, adjust the volume of the headset itself.

2. The master transmit controls of the headset are the ABCD switch settings on the bottom of the base. A is the lowest and D is the highest setting.

3. You can fine tune this setting with the plus (+) and minus (-) buttons on the back of the charging base.

4. If this doesn't fix the echo, try moving the configuration dial on the left side of the charging base. The recommended setting for most phones is 1.

Posted on Jul 18, 2009

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If the party you call cannot hear you, check two things:

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How to Reset your Plantronics CS55 Wireless Headset

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Echo is usually caused by the transmit (speak) level on the unit being set too high.

1. First, try lowering the volume of the telephone. If you still hear an echo, adjust the volume of the headset itself.

2. The master transmit controls of the headset are the ABCD switch settings on the bottom of the base. A is the lowest and D is the highest setting.

3. You can fine tune this setting with the plus (+) and minus (-) buttons on the back of the charging base.

4. If this doesn't fix the echo, try moving the configuration dial on the left side of the charging base. The recommended setting for most phones is 1.

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1 Answer

I am getting feedback and an echo in my Plantronic CS55 wireless


Had similar issue.

This how I fixed it
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3) set sound lever on the back to "1"
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James, plug the phone cord that comes out of the back of the CS55 base into the handset port of the Cisco phone, not the headset port.  Then plug the coily cord from the cisco receiver into the front of the CS55.  Don't use the "Headset" button on your Cisco phone, just lift the receiver off.

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