Nortel Communication Server 1000 Manual page 27

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 27)
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
Table 4
Local Steering Codes application
PBX A
LSC
584
Route DMI
Del Ins
1 1 -
DMI
Del Ins
2 -
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
Numbering plans for DASS2 routes 27
provide examples of how distant
PBX B
SPN RLI
58 201
PBX B
LSC
59
and Table 4 "Local
Route DMI
De In
l s
1 1 -
DMI
Del Ins
2 -