Wireless: Press ISO on the WH-210 is not sending audio to the AUX port on a DX210 basestation
If a WH-210 headset is not sending a audio signal out the AUX channel it is possible that the headset ISO has been locked out on that headset.
To re engage (assuming proper registration of headset is complete with base) power off the headset. Then press and hold the IC-1 and ISO button then power on the headset. Release the IC-1 and ISO buttons when the "POWER ON" indicator has occurred (you know that little voice that says "Power On"). The ISO mode should now be enabled.