Beeping sort of

The phone may be in headset mode. If you can hear sounds through the headset but cannot hear sounds from the earpiece on the phone, it's in headset mode. Power down the phone and restart it. Otherwise no sound from the earpiece mean a bad earpiece.

The three beeps usually indicate low talk time. If you have tried turning off and on your headset and still have the annoying beeps, then there is a problem with the device. You'll need to contact your retailer or Plantronics (800-544-4660 x5538) for warranty replacement. If it's out of warranty, check out our website Headsets Direct for the latest in Bluetooth headsets.

Good luck from Headsets Direct!

Here is an explanation of the beeps you are hearing:

• One beep every 10 seconds is caused by a low battery
warning. Recharge battery by returning it to the base charge
cradle for one to three hours until charge light stays lit or
quits blinking.
• Two beeps is an out of range warning. Move closer to the base.
• Three rapid beeps every 30 seconds indicates your mute is
on. Press the mute button once to turn mute off.
• When an optional lifter is connected, three repetitive beeps
indicate a call is coming into the headset. Press the call
control button on the headset to answer the call.

Plantronics CS70 User's Guide

Good luck from Headsets Direct!

I sounds like the battery is not holding a charge. You may need to replace the battery soon. The beeping typically indicates a low battery

it asking for passkey code

Is it in mute mode?
http://www.motorola.com/mdirect/demos/how2_h500/h500.html

Make sure the headpiece is charged. Turn the headpiece off by pressing the little black button on top of the earpiece and holding for about 5 seconds. Turn the earpiece back on again the same way. You should have a slow flashing blue light on the mic boom. The base station will now try to find the earpiece and within about 20 seconds the red light on the base should be steady and blue light on top should be on.
If this doesn't work you may need to manually pair the earpiece to the base by pressing and holding the Listen Volume Adjust + Button and headset Call Control Button on the earpiece until the light on the mic boom flashes red and blue repeatedly. As above, the base station will now try to find the earpiece and within about 20 seconds the red light on the base should be steady and blue light on top should be on.

with mine, all I do is hold the top button down for about 8 seconds until I hear a tone/beep. Then have my phone search for an audio device and it picks of the earset and ready to go. I hope this helps.

I think the normal talk time is around 6 to 8 hrs if your battery is holding less you probably have a unit with a faulty battery
how old is your headset

I had the same problem and the cause was the handset lifter and not the earpiece--if the ringtone is too low at the lifter, it won't be detected and transmitted to the earpiece. Cranked up the ringtone and everything is fine.

If that doesn't take care of the problem you might look at whether or not you're using custom ringtones which might cause a problem. Switch them back to the defaults and see if the problem goes away.