5.21.2.3.7. US EPNP network with overlapping L0 codes for extension, with
exit, without prefixes 
It is also possible to configure PNP without prefixes, but with exit. For
this purpose, an entry must be made in KNPRE:
ADD-KNPRE:NPI=PRIVATE,TON=LOCAL,EXIT=9; ADD-KNPRE:NPI=PRIVATE,TON=LEVEL1,EXIT=9; ADD-KNPRE:NPI=PRIVATE,TON=LEVEL2,EXIT=9;
The dial plan must be adapted accordingly.
Such a configuration may be required if ambiguities appear between
extensions and local codes during the merging of networks. In Figure
61, for example, Subscriber 636 could exit in physical node
1-1-91. The dialing of 636 by a subscriber in 1-1-91 should then lead
to internal subscriber 636, while the dialing of 9-636-xxxx should lead
to the partner node.
The last configuration examples have shown different types of analysis
for the dial pattern. Principally, the analysis of the dial pattern consists
of the digit analysis (AMO WABE) and LCR dial plan (AMO LDPLN) steps.
If required, a loop back to the digit analysis (AMO WABE) can be configured
using the RERTEINT LDAT attribute.
IMPORTANT:
Configure the analysis of the dial pattern in
as few steps as possible.