When the Direct Frequency field is enabled, the MPL Direct / Talkaround parameters can then be modified on a per MPL List basis. Once modified, the radio may then be transmitting and receiving on a different carrier frequency and / or frequency parameters while operating in Direct / Talkaround mode.

When the Direct Frequency field is disabled, the settings for the MPL Rx parameter fields are also used for Direct/Talkaround functionality. Therefore when in Direct / Talkaround mode, the radio is transmitting and receiving on the same carrier frequency and frequency parameters.

Direct / Talkaround must be enabled on a frequency options profile in order to be available to the radio-user for a radio channel. Direct/Talkaround mode is selected by the radio-user with the Direct / Talkaround button-press, the  Talkaround / Direct switch-selection, or the Direct / Talkaround menu-selection.

The MPL menu can only be accessed by the radio-user when the radio is operating on a Conventional communications channel that has its Rx Voice / Signal Type field set to "Non-ASTRO", and has its User Selectable PL [MPL] field enabled.

Either the Multiple Private Line button-press or the Multiple Private Line menu-selection must be CPS-defined thus allowing the radio-user to select the desired PL settings / list.