Nortel Communication Server 1000 Manual page 32

32 Overview
PSTN number barring
There may be a requirement to allow callers to dial certain PSTN numbers
whilst barring others. For example, network callers may be allowed to dial
PSTN numbers within the UK, but are barred from international dialing.
To achieve this, Special number '0' can be defined and entered in an
associated SDRR table as a DENY, (that is, barred) entry. Note that a
sequence which may not be defined is '01', (that is, 010, which is the
international dialing code). There may be a requirement to allow callers to
dial certain PSTN numbers whilst barring others.
Alternatively, there may be a requirement to bar PSTN dialing outside of
the local area, with the exception of a few area codes. For example, if
users are to be allowed to make local PSTN calls and calls to London,
Liverpool, Birmingham and Manchester only, then the following Special
Numbers would be defined:
021
051
061
071
081
1
2
3
4
5
6
7
8
9
Routing of DDI Calls
An Incoming Digit Conversion (IDC) table must be assigned to the DASS2
route to convert the received "1xx" and "2xx" digit sequences. The "1xx"
must be converted to the node A extension number "41xx". The "2xx" is
converted to the CDP DN which will permit routing and termination on the
node B extension "32xx". Refer to
digit conversion table" (page
Birmingham
Liverpool
Manchester
Inner London
Outer London
Local
Local
Local
Local
Local
Local
Local
Local
Local
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
Table 10 "Application of an incoming
33).