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Appendix B — Basic and Network Alternate Route Selection (BARS/NARS) Page 1475 of 1536
Table 76
DRR (X11, release 8 and up)
Call type
Network translation
table (number of digits)
SDRR block
(number of
digits)
NPA 3 - 10 1 to (10 - N)
1NPA 4 - 11 1 to (11 - N)
NXX 3 - 7 1 to (7 - N)
1NXX 4 - 8 1 to (8 - N)
SPN 1 - 11 1 to (10 - N)
ISPN 1 - 4 1 to (11 - N)
Note 1: The value N is equal to the number of digits defined in the Network
Translation table.
Up to 512 SDRR blocks can be defined for NARS (256 for BARS). Each
table can contain up to 64 entries.
Off-Net numbers are recognized at the last intelligent BARS or NARS
switch. Translation of the NPA, NXX or SPN identifies the method of
treatment for the call. If the data type is SDRR and the index is an SDRR
table index, supplemental digit recognition/restriction is applied by
comparing the dialed digits with the numbers declared in the SDRR block.
— If no match is found in the SDRR, route selection is called, call
processing resumes and the call is routed to the CO of the terminating
off-net number.
— If a match is found and the number is in the "denied" block, standard call
blocking takes place.
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