AT Commands for Bluetooth PTT - Licence Key only for DP3xx1e / DP4x01e radios.

This orders the Licence key to activate the AT Commands for Bluetooth PTT in a DP3xx1e / DP4x01e radio. This feature enables specific 3rd party Bluetooth accessories to access the radio's "Push-To-Talk" functionality wirelessly. (Peltor, Silenta etc.)