Nortel Communication Server 1000 Manual page 26

26 Overview
for extensions on nodes A and B respectively. The numbering plan ensures
that calls to these numbers originated from within the private network are
not routed via the DASS2 route (and thus do not incur call charges).
For incoming DASS2 DDI calls from the PSTN, three digits are received
which must be converted into an internal network number. The sequence
1xx corresponds to the last three digits of a DN at node A, and 2xx to the
last three digits of a DN at node B. Note that the Incoming Digit Conversion
(IDC) feature can be used to provide flexible mapping from received digits
to internal DNs. In this case the simplest mapping is chosen. 1xx maps to
DNs 41xx on node A, and 2xx to DNs 32xx on node B. No other extensions
on the network are accessible using DDI.
Digit Insertion
At both nodes, the DPNSS1 route is programmed to insert a leading digit
of "5" (using the INST prompt in LD16), the network access code, for all
incoming calls. The same effect could have been achieved by using Digit
Manipulation at the originating end of the DPNSS1 call to insert the "5". The
advantage of the method chosen is that configuration data relating to the
network access code of node A is restricted to A (or B); thus if the access
code should be changed, node A is the only node where reprogramming
would be needed.
Dialing Network Numbers
Routing of calls from one network node to an extension on the other node
is done using the CDP feature. The network coordinated dialing plan DN
length is six digits. Essentially, CDP is used to synthesize a location code
dialing plan. The network access code, "5", and the node location codes,
"8" and "9", are absorbed into the programmed distant steering codes and
local steering codes.
Table 3 "Distant Steering Codes application" (page 26)
Steering Codes application" (page 27)
steering codes and local steering codes are applied.
Table 3
Distant Steering Codes application
PBX A
DSC RLI
59 101
Copyright © 2007, Nortel Networks
.
Route DMI
Del Ins
1 1 -
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
provide examples of how distant
PBX B
SPN RLI
58 201
and Table 4 "Local
Route DMI
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el ns
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