CHAPTER 1 GENERAL INFORMATION
– 48 – NWA-008853-001 Rev.3.0
97ch1001.fm
Limitations on developing the Uniform Numbering Plan are as follows:
(1) Station Number (Closed Numbering)
• The dialing number must be formed as follows:
• When providing 3-digit or 4-digit station numbering within the No. 7 CCIS network, the data assign-
ment of the Originating Office Number (CMA7 Y=06) is not necessary because the Originating Of-
fice Number is included in the originating station number.
• LCR Group 3 (CM20>A129) must be used for assigning an LCR access code.
(2) Office Code and Station Number (Open Numbering)
• The dialing number must be formed as follows.
(a) 4 digits
(a) + (b) 4 digits
(c) 8 digits
a1 ≠ c1
XXXXXXXX
Station Number
(Maximum 8 digits)
Office Location Number
(Maximum 2 digits)
a
1
b
1
b
2
b
3
c
1
c
2
c
3
c
4
c
5
c
6
c
7
c
8
Station Number (c)
Office Code (b)
Access Code (a)
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NETWORK STRUCTURE CONSIDERATIONS
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