Specifications

Summary
Voice terminal models BIS-34 and BIS-34D are ideal for the system
administrator/attendant console because their features allow you to easily use
all the system’s features.
You can also use the BIS-22 and the 3CButton
Deluxe models as the console. However, the SP-34, SP-34D, BE-10, HFAI-10,
lo-Button, and 5-Button voice terminals are not recommended for use as an
administer/attendant console because the administrator would be unable to
see which buttons were being assigned special features during system
administration. In addition, lo- and 22-button voice terminals cannot be used
to program certain system features.