Set up my plantronics s12 exactly as stated in manual but it will not work. i can not get a dial tone or speak through it. please help

The S10 amplifier/headset system sets up like the Plantronics S12 system of which the user guide is included in the link below. As you will notice, it is designed to work with a telephone. It will not work as a stand-alone unit. To connect it to a dsl box, magic jack or any other line you will need a phone.

Plantronics S12 User's Guide

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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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The CS70 headset is definitely paired up to the base and has a good connection if the lifter raises up, sounds like maybe the compatibility setting may need adjusting. The number one should be in the three O'clock position, the compatibility setting is on the left side of the base unit. Here is a link below for the user guide if you need help with the adjustment.

Plantronics CS70 User's Guide

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Unfortunately, the phone does matter. The S12 is designed to work with office style phones where the handset is just the mouthpiece, all other features located on the base. My suggestion is to get a phone of that style (you can find inexpensive ones at Wally world) and connect the headset following the instructions on this link for the Plantronics S12.

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If this suddenly just happened, take the battery cap off from the head piece. Detach the battery and wait 5 seconds, re-attached the battery and you should be good to go.
If this is your first time setting up, there's a round dial on the left side that you have to adjust. Keep the phone on with the dial tone and try different settings on the round dial. There should be a setting that'll give you a clear tone.

Well it looks like the best solution would to buy another headset assembly. You could short out the whole system if you do not. see link below. It's @ 70 bucks but look on eBay and you might find a good deal.
http://www.plantronics.com/north_america/en_US/products/home/home-headset-accessories

The Plantronics S11 headset system is meant to plug into the handset jack on your phone not the headset jack. Check the connection on the S11 to make sure the handset jack is where it is plugged into at.

Here are a few suggestions from Plantronics if you are not getting a dial tone:

Make sure all cable connections are correct and firmly in place.

Pay special attention that handset cord is properly connected.

Ensure AC power adapter is connected and power is on.
Make sure you have pressed the headset button and the headset indicator is on.

Make sure the telephone handset is off-hook.

Adjust listen volume control.

Adjust the compatibility slide switch.

Ensure that the headset is centered on your ear.

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not a radio communications issue

This may be caused by a few things.

1. Check the configuration dial on the left hand side of the base to see if another setting works better. The recommended setting for most phones is 1.

2. Make sure your speaking (transmit) level is not too high. First, try lowering the volume on the telephone. If you still hear distortion, adjust the volume of the headset. The master transmit controls are the ABCD switch settings on the bottom of the base. A is the lowest and D is the highest setting. You can fine tune this setting with the Plus (+) and minus (-) buttons on the back of the base that are above and below the picture of the microphone.

3. Double check the battery has a full charge.

The Amber Charge light on the base will flash while charging and will stay solid amber when fully charged.

3 hours = full charge

4. Make sure the headset has been paired to the base.

Perform a reset on the headset.  Hold down the mute button (the dial on the back of the headset needs to be pushed straight in), and at the same time hold down the call answer button until you see the green light on the headset blink a few times.  Release both the mute button and the call answer button.  See if it works now.  If it doesn't, try a re-subscription (should be available in the manual).