Creating Dialing Plans - Nortel BCM50 Configuration Manual

218 Chapter 24 Dialing plans
Also refer to "Call security: Restriction filters" on page
Service (CoS) passwords, which you can use so that users can access the system features over
public connections. Refer to

Creating dialing plans

Dialing plans allow users to access the public network, to make calls, and to answer dial strings.
Access to and from and within your system is based on dialing strings and how the system adds or
deletes digits from this sequence to route the call.
A dialing string is the numbers that the caller physically enters on a telephone or programs onto a
memory key. This can also include numbers the system adds to a dial string when a call goes
through call routing.
This process also includes how the receiving system reads the sequence. All of which means that
coordination is required at both ends of the call to ensure that calls are routed correctly. This is
especially important if calls need to be routed through your system, or through a remote system, to
reach another node on the network.
Basic numbering: The first numbering that you set is your DN length (Start DN length) and
Start DN and Public and Private Received # length. DN length and Start DN information is
entered when the system is initially set up. These numbers can be changed after the system has
been set up, but only at the risk of compromising other numbering in the system. If your system is
part of a network, these numbers must be coordinated with the other nodes in the network to
ensure that the network dialing plans are consistent. The Public and Private Received Number
lengths take their sequence from the initial DN length, but this can be changed to accommodate
local dialing requirements, the Private length should mirror the DN length, except in special
circumstances. Refer to
Variable
Start DN
DN length, Received # length
Private length
Public length (max)
Remote access: When you set up lines that do not offer DISA directly on the line, you can
determine if remote access prompts with DISA or allows auto answering. This determines the
Public/Private Auto DN and Public/Private DISA DN settings, which are set under Configuration
> Telephony > Dialing Plan > Public Network and Private Network. These numbers will have
the same first number as you specified in the Start DN and be of the same length. Remote callers
dial the system public or private access number, and then dial either the Private/Public Auto DN or
Private/Public DISA DN, as determined by the line setup.
Variable
Private Auto DN
NN40020-603 NN40020-603
"Call security and remote access" on page
"Incoming call routing" on page
Example settings
2 (221)
3
12 (North America)
Example or default settings
2XX
433. This section also discusses Class of
415.
224.