User's Manual Part 1

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OEM Privacy key
When using OEM Selcall protocol, OEM calls can either be sent plain text or
encrypted. This is done by using either the privacy key programmed by the
programming software or if no privacy key is programmed the default value of
9999999. Selecting “On” will encrypt calls, selecting “Off” will send plain text calls.
Use the Scroll keys to select the setting required (example
shows selection OEM Privacy key “On”):-
press the key