The CS50 wireless headset and charging base unit are originally subscribed or paired to each other. If your CS50 headset breaks or you lose it and a replacement headset is necessary, you will have to “re-subscribe” or “pair” the new CS50 headset to the base unit. This is a very simple process that takes only 2-3 minutes and no tools are required. Please be aware that if you have the CS50, you will need replacement headset model number Plantronics 64402-14. Although the CS50 and CS50 headsets look the same, they are not interchangeable. The Subscription process is as follows:
Step 1: Return the CS50 headset to the headset base/charging cradle.
Step 2: On the back of the base unit, press and hold both of the microphone (talk) volume buttons (+ and -) for a minimum of 5 seconds.
The red power indicator light on the front of the base will then start to flash, when it does, let the buttons go.
Step 3: Push in (down in the picture) and hold the black mute button for a minimum of 5 seconds (The mute button is located at the end of the headset).
The green light on the headset will then come on.
(Keep in mind that these 2 things need to be happening at the same time – red light flashing and green light illuminated on headset)
Successful re-subscription is indicated when the red power light stops flashing and is solid, and the light goes off on the headset.
Step 4: The last step is to unplug the AC power adapter for 5 seconds, then reconnect. You can do this by unplugging at the wall or the bottom of the base (as pictured).
Note: If re-subscription fails within 2 minutes the CS50 headset will return to the un-subscribed state. Try the re-subscription process again.