NEC Electra Elite 48/192 Features And Specifications Manual page 411

Issue 6
K - 2
When the system is set as multifunction, CO/PBX lines can be
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accessed from internal dial tone by dialing a Trunk Access Code.
KF or MF selection is set by a hardware switch on the CPUB( )-U10
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ETU in the B64-U10 KSU or the MBD-U10 Unit in the B48-U10 KSU.
To change the KF/MF selection after First Initialization of the system,
First Initialization must be performed again.
In KF mode, Single Line Telephones can be used for internal calls
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and can access an outside line using the specified trunk seizure
Access Code or Prime Line Pickup assignment.
Key Function/Multifunction Registration
Electra Elite