There have been reports of the WH62 headset when paired with the T3X and T4xU series phones not havingany audio.

This includes ringing or correct lights showing on the WH62.

To resolve this issue please ensure you have the latest F/W installed on the WH62

For the T3x & T4xU series phones install the appropriate F/W version below

T3x Series

Note: You also require the EHS35 for this to work.

T4xU Series