Voyager 510S/510SL/510SL+: How to Subscribe (Pair) a Headset to the Base
How do I subscribe (pair) my Voyager 510s headset to its charging base?
The headset and base unit are subscribed to each other right out of the box. If you need to use a replacement headset with the base, you have to subscribe (or introduce) the new headset to the base. Additionally, if you have linking issues or can't hear your callers, try resubscribing the headset to the base.
To subscribe a new headset or resubscribe an existing headset:
Place the charging base into pairing mode. To do so, press and hold the volume up (+) and volume down (-) buttons at the same time until the lights on the base unit starts flashing red and blue.
Place the headset into pairing mode. To do so, turn the headset on, then press and hold the volume up (+) button and call control button at the same time until the light on the headset starts flashing an alternating red-blue (it might take 5-6 seconds). If you have issues getting the headset into pairing mode, fully charge the headset and then try again.
The lights on the base unit and headset will continue to flash until they subscribe/pair to each other. Once they are paired, the talk/on line indicator light on the top of the base unit glows solid blue.
If the units do not resubscribe within 2 minutes, they will return to an unsubscribed state. Try powering both devices off and back on again, then repeating the steps above.