NEC M155 User Manual page 26

DECT system configuration
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13. Repeatedly press the Upper key for a short
time until the display shows: the required
digit.
14. Press the Lower key for a short time.
Note that the selected digit is added to the
code.
15. Repeat previous two steps until the complete
code is formed.
16. Repeatedly press the Upper key for a short
time until the display shows:
17. Press the Lower key for a short time.
18. Enter the authentication code at the
prompt.
19. Repeatedly press the Upper key for a short
time until the display shows: the required
digit.
20. Press the Lower key for a short time.
Note that the selected digit is added to the
code.
21. Repeat previous two steps until the complete
code is formed.
22. Repeatedly press the Upper key for a short
time until the display shows: Start Reg
Enter AC
AC