Please see the documentation that was included with your specific EHS Cable for proper installation. The next thing you can try is setting the application switch. This is located on the bottom of the CS540 charging base. You can identify this because it has a switch that can be set between settings A through G. Make sure that this is set on A. Having this on the wrong setting can result in echo and other abnormal sounds. Static, bad sound quality, or quit working

A-2) Plug the small modular adapter of the Telephone Interface Cable into your telephone’s handset port. NOTE: If you don’t have a dial tone, don’t panic. You simply need to change the compatibility slide switch to work with your phone. See Step 5 Compatibility Slide Switch below.

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If you are on a call and the headset battery is critically low, you will hear a repeated single beeps every seconds indicating the battery is low. You should recharge the CS540 wireless headset immediately. In most all cases, echo is caused by having volume(s) set too high. When you stop to consider that the different volumes that need to be adjust properly include:

This fantastic product from Plantronics is the ultimate in wireless freedom for your office. The stylish Plantronics CS540 wireless headset boasts superb sound quality and hands-free freedom of up to 120 metres from your desk - in a typical office, up to 50m. The Plantronics CS540 is lightweight and comfortable to wear and can easily connect to your phone system - it converts any corded desk telephone into a fully wireless solution. Plantronics CS540 has a user replaceable battery. To ensure replacement batteries meet Plantronics high quality standards and for optimal performance, use only OEM replacement batteries by Plantronics. This is one of those situations where you say, I’ve good news, and bad news, which would you like to hear first? If you answered using your Plantronics CS540 with a mobile phone, I have to be the bearer of bad news. No, you cannot. That’s all you do because once the headset is removed from the base, it turns on automatically without the need to press the call control button on the headset.

The Plantronics CS540 headset also has premium wideband audio quality as well as wireless mobility, all with the same reliability for hands-free productivity that has made the CS family such a popular choice for so many years.