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Page 1474 of 1536 Appendix B — Basic and Network Alternate Route Selection (BARS/NARS)
Off-net number recognition (X11 release 5+)
Off-Net Number Recognition eliminates the need for using two extra CO
trunks, when a subscriber, using the private network, dials a DID or DDD
number that terminates at a BARS or NARS location. Calls are routed
directly to the dialed DN (DID calls) or to the LDN (DDD calls), rather than
being switched from the terminating switch to the CO and back again.
Off-net number recognition parameters for local and remote DDD and DID
locations are defined by the customer in the Network Translation tables and
Supplemental Digit Recognition/Restriction blocks (SDRR). Recognition of
up to 10 digits can be defined for SL-1 with X11 release 5 or 7 software as
follows:
Table 75
SDRR (X11 release 5 or 7)
Call type
With 11-Digit Translation, available on X11 release 8 and later, up to 11
digits can be defined in the following table.
553-3011-315 Standard 10.0 May 1999
Network translation
table (number of digits)
SDRR block
(number of
digits)
NPA 3 1 - 7
1NPA 4 1 - 7
NXX 3 1 - 4
1NXX 4 1 - 4
SPN 4 1 - 6
ISPN 4 1 - 7