Troubleshoot/Setup Plantronics CS540 When There is No Dial Tone

How to trouble-shoot or setup a Plantronics Wireless headset (CS510, CS530, CS520, CS540) when you don't get a dial tone from the phone it's attached to.
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[@retailmsc]

this should not be labeled troubleshooting.
I have no sound on the headset
the unit is fully charged
when pressed, the phone lifts and the outside line is connected.
I cannot hear anyone and no one can hear me.

[@carobea]

It worked by removing the small battery🎉 thank you so much

[@Noah-qd8of]

This did the trick, thanks! I have the CS540 and recently switch from a Grandstream phone with mechanical lifter to an OBIHAI phone with electronic hook switch. After ordering the necessary OBIEHS and Plantronics APS-11 adapter cables for the phone and headset base respectively, the electronic hook switch was working but I wasn't getting a dial tone or call audio in my headset. Switching the configuration on the headset base to A worked. It was previously set to D with my old phone.

[@bambii1955]

I've literally done all this and when I pick up the headset it doesn't activate the lifter or make a dial tone. It used to until i accidentally unplugged the power cable and now it's not working

[@KimFromNO1]

I have had 3 of these and neither worked. Even after calling tech support for each purchase it has been a failure. When I try to use it now I hear an echo and faint thumping noice, but no dial tone. I'm a smart girl and can usually figure these things out and repeated all the steps in this video and still nothing.

[@lxc420]

not that smart

[@lxc420]

ThomasAndCathy Olive 😂😂😂

[@johnnyr8603]

Yea no I tried all the steps and this did not work. Configuration is set to A. I even tried D which is supposed to help for certain phones and I got nothing. I tried the button on the charging port itself and still nothing.

[@kcoolrule]

Still doesn’t work and slow down man we are trying to troubleshoot and follow along way too fast

[@tanyab1088]

That was a really bad video. You went so fast and didn't even reference the second step in re-subscribing the base and headset.