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Page 1476 of 1536 Appendix B — Basic and Network Alternate Route Selection (BARS/NARS)
— If a match is found and the number is recognized as a terminating number
at the local switch (for example, the last intelligent BARS or NARS
switch), the call is terminated at the station DN (DID calls) or at the
attendant DN (DDD calls).
— If a match is found and the dialed number is a recognized number
terminating at a remote switch, route selection is called, the special digit
manipulation takes place and the call is routed directly to the main. DID
calls terminate at the dialed station and DDD calls terminate at the
attendant DN. Remote recognition applies to Tie trunks only.
Supplemental digit restriction (release dependent)
Supplemental digit restriction blocks (see Table 77) function as follows:
— block (deny) access to certain telephone numbers
— recognize Off-Net calls dialed to On-Net locations
— prevent routing of calls to the home switch of the originating trunk group
by either on-net or off-net facilities.
The customer can also specify through SL-1 service change the treatment that
blocked calls receive; for example, overflow tone, intercept to attendant, or
recorded announcement.
Table 77
Supplemental digit restriction blocks per NARS or BARS
Network package
553-3011-315 Standard 10.0 May 1999
X11 release 4
and earlier
maximum
X11 release 5
and later
maximum
NARS 256 512
BARS 32 256
Note 1: For X11 release 4 and earlier, one block can restrict up to 16
numbers. For X11 release 5 and later software, one block can recognize
or restrict up to 64 numbers.