NEC 28i System Manual page 116

0501 - System Numbering
1=Service Code, 2=Extension Number, 6=Trunk Access,
Dial Types:
7=Operator Access, 8=Alternate Trunk Access, 0, 3-5=Not Used
Dialed Number of Digits Required
Number
5X
51
52
53
54
55
56
57
58
59
50
5*
5#
6X
61
62
63
64
65
66
67
68
69
60
6*
6#
4-14
System Numbering
Default New
3
0
0
0
0
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
For Your Notes
Dial Type
Default New
2
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0