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AT&T
Form B: Centrex Extension Numbers
Line Jack* Extension Jack*
Name/Description Centrex Extension No.
Centrex Phone No.
Number
Number
01
10
02
11
03
12
04
13
05
14
06
15
07
16
08
17
09
18
10
19
11
20
12
21
13
22
14
23
15
24
16
25
17
26
18
27
19
28
20
29
21
30
22
31
23
32
24
33
* Indicate any changes to default line jack numbers or extension jack numbers in the space provided in these columns, if applicable