Nortel Modular Ics 6.1 Installer Guide

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DID trunks
DID trunks give you direct inward dialing (DID) from the 
public network. A typical application of these trunks is to map 
incoming digits onto target line appearances within the 
Norstar system. DID trunks can operate only as auto-answer 
trunks.
Ta r g e t  l i n e s
204
205
206
207
208
209Central office (CO)
Norstar
DID trunk
593-1234
593-1235
593-1236
593-1237
593-1238
593-1239 
						

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When a call comes in on a DID trunk, the Norstar system 
interprets the incoming digits in one of the following ways.
• If the digits map onto a target line, the call is routed to all 
telephones with an appearance of that target line.
• If the digits map onto the DISA DN, the caller hears 
stuttered dial tone. They must enter a six-digit Class of 
Service (COS) password from a DTMF telephone to hear 
system dial tone. 
They can then enter a:
— target line number
— line pool access code
— remote feature code
• If the digits map onto the Auto DN, the caller hears system 
dial tone. They can then enter:
— a target line number
— the DISA DN, which will prompt for a Class of Service 
password
— a line pool access code
— a destination code
— a remote feature code from a DTMF telephone
Tips - Each DID Trunk Cartridge can provide four DID 
trunks. Each DID Trunk Cartridge also has four DTMF 
receivers dedicated to those trunks. A DTI can provide up to 24 
DID trunks.
You cannot configure a DID trunk as the prime line for a 
Norstar telephone or a Business Series Terminal.
The capabilities available to a remote caller are determined by 
the remote filters and remote package assigned to a line, or by 
the set restrictions, line restrictions and remote package 
assigned to the Class of Service password. 
						

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Analog loop start trunks
Loop start trunks give you incoming and outgoing access to 
the public network. Loop start trunks can be configured as 
manual-answer or auto-answer. The answer mode determines 
how the system handles incoming calls.
When a call comes in on a manual-answer loop start trunk, it 
alerts at all telephones with that line appearance. 
When a call comes in on an auto-answer loop start trunk that 
is configured to answer with direct inward system access 
(DISA), the caller hears a stuttered dial tone. They must enter 
a six-digit Class of Service (COS) password from a DTMF 
telephone to access system dial tone. 
Once the caller has system dial tone, they can then enter: 
• a target line number
• a line pool access code
• a remote feature code. 
By default, auto answer loop start trunks are configured to 
answer with DISA, and are used to provide controlled access 
to Norstar system resources.
When a call comes in on an auto-answer loop start trunk that 
is not configured to answer with DISA, the caller hears system 
dial tone. 
They can then enter:
• a target line number
• the DISA DN, which will prompt for a Class of Service 
password
• a line pool access code
• a remote feature code from a DTMF telephone 
						

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To place an outgoing call, a loop start line can be selected by:
• pressing a line button on the telephone
• dialing a line pool access code
• pressing a memory button that has been programmed with 
a line pool access code
Configuration tips
• Loop start signaling is supported by Loop Start Trunk 
Cartridges, Call Information (CI) Trunk Cartridges and 
Digital Trunk Interfaces (DTI). Each Loop Start Trunk 
Cartridge or CI Trunk Cartridge can provide four loop start 
trunks. A DTI can provide up to 24 loop start trunks. If you 
wish to configure your loop start trunks as auto-answer, 
the trunks must have disconnect supervision.
• For Loop Start or CI Trunk Cartridges installed in a Trunk 
Module, you will also need one E&M/DISA Trunk 
Cartridge for every two loop start trunks that you configure 
as auto-answer. The E&M/DISA Trunk Cartridge provides 
two DTMF receivers to receive the incoming digits from 
the central office. An auto-answer loop start trunk can give 
you the same kind of direct inward dialing function as a 
DID trunk.
• If your system includes both loop start trunks and DID 
trunks, you would typically use loop start trunks for 
outgoing calls and DID trunks for incoming calls.
• You may configure a loop start trunk as the prime line for 
a Norstar telephone or a Business Series Terminal.
• The capabilities available to a remote caller are determined 
by the remote filters and remote package assigned to a line, 
or by the set restrictions, line restrictions, and remote 
package assigned to the Class of Service password. 
						

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• Two loopstart trunk cartridges are compatible with 
Modular ICS 6.1. The NT5B40GA-93 can be installed in 
trunk module (TM) slots only. The NT7B75GA-93 can be 
installed in either core slots three or four, or TM slots one, 
two, or three.
Analog E&M trunks
An Analog E&M trunk gives you incoming and outgoing 
access to other systems in a private network. E&M trunks can 
be configured as manual-answer or auto-answer. The answer 
mode determines how the system handles incoming calls.
Key system
E&M
intelligent networkPA B X
PBX
PBX
E&M
Key system
Norstar
Norstar
E&M
Private network
E&M/DISA
Tr u n k
Cartridges 
						

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By default, auto-answer E&M trunks are answered by the 
system with direct inward system access (DISA), and are used 
to provide controlled access to Norstar system resources.
When a call comes in on a manual-answer E&M trunk, it alerts 
at all telephones with that line appearance.
When a call comes in on an auto-answer E&M trunk that is 
configured to answer with DISA, the caller hears stuttered dial 
tone. They must enter a six-digit COS password from a DTMF 
telephone to hear system dial tone.
They can then enter a:
• target line number
• line pool access code
• remote feature code
When a call comes in on an auto-answer E&M trunk that is not 
configured to answer with DISA, the caller hears system dial 
tone. At that point they can then enter one of the following:
• a target line number
• the DISA DN, which will prompt for a COS password
• a line pool access code or a destination code
• a remote feature code from a DTMF telephone
To place an outgoing call, an E&M trunk can be selected by 
one of the following:
• pressing a line button on the telephone
• dialing a line pool access code or destination code
• pressing a memory button that has been programmed with 
a line pool access code or destination code. 
						

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BRI trunks
BRI trunks give you incoming and outgoing access to an ISDN 
network. Like loop start trunks, they can be configured as 
manual-answer or auto-answer. See Ans mode on page 359.
BRI trunks provide a fast, accurate, and reliable means of 
sending and receiving data, images, text, and voice 
information. Using BRI lines allows for faster transmission 
speeds and the addition of a variety of powerful business 
applications, including remote LAN access, video 
conferencing, file transfer and Internet access.
For more information, see Welcome to ISDN on page 43.
Note Profile 2: European BRI trunks can only be EURO 
trunks.
PRI trunks
PRI trunks are used for incoming and outgoing calls over an 
ISDN network. PRI trunks are automatically set to auto-
answer.
Incoming calls are routed to system telephones through 
assigned target lines. Outgoing calls are made using the 
intercom key assigned to a PRI line pool, or by entering a 
destination code to which a route has been defined using PRI 
line pools. You cannot assign a PRI line directly to a 
telephone.
PRI Sl-1 lines also can provide MCDN network functionality 
over a private network between other Norstar systems, 
Meridian 1 systems, or Business Communications Systems, if 
the appropriate keycode has been installed. Private networking 
is described in Networking with Norstar on page 99. 
						

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Target lines
A target line is an internal communication path that is reached 
by means of digits received from an incoming trunk. Target 
lines are assigned to answer direct-dial incoming calls but they 
cannot be used to make outgoing calls.
You can program auto-answer trunks to map to target lines to 
provide for attendant bypass, which allows the call to go 
directly to a department or individual, and to create line 
concentration, where one trunk can map onto several target 
lines.
No target lines are automatically assigned to telephones, 
except if the DID template has been applied to the system.
Target lines are configured using line numbers 157-348 or 
157-284, in the same way as physical lines.
Privacy issue
You can set a target line to Private (default is 
Public), however, such features as Call Pickup 
can still answer these lines at other telephones in 
the group. 
						

							P0603534  02Modular ICS 6.1 Installer Guide
Remote system access
The remote access feature allows callers elsewhere on the 
private or the public network to access a Norstar system by 
dialing directly into the system without going through an 
attendant. Once in the system, the remote user can use some of 
the system resources. The remote access must be enabled in 
programming before callers can use it.
Norstar systems support remote system access on the 
following trunk types, which may require the remote caller to 
enter a COS password for direct inward system access (DISA):
• auto-answer loop start trunks
• auto-answer E&M trunks
• DID trunks, by means of the DISA DN
• PRI trunks, by means of the DISA DN
The system resources, such as dialing capabilities, line pool 
access and feature access, that a remote user may access 
depends on the Class of Service (COS) assigned to the user. 
See Class of Service on page 93, COS pswds on page 401 and 
the Modular ICS 6.1 System Coordinator Guide for more 
details.
Use system features during a remote call
To use features on a Norstar system during a remote call-in, 
press •, followed by the feature code. Even if you are calling 
from another Norstar system or from within a private network, 
press • instead of ≤. 
						

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Remote access on loop start and E&M trunks
Loop start trunks provide remote access to Norstar from the 
public network. E&M trunks provide remote access from a 
private network. Each must be configured to be auto-answer to 
provide remote system access. 
A loop start trunk must have disconnect supervision if it is to 
operate in auto-answer mode. E&M trunks always operate in 
disconnect supervised mode.
When a caller dials into the system on a line that has auto-
answer, the system answers with system dial tone and no COS 
password is required. In this case, control over the system 
capabilities available to the caller is provided only by the 
restriction filters assigned to the line.
When a caller dials in on a line that has auto-answer with 
DISA, the system answers with stuttered dial tone. This is the 
prompt to enter a COS password. The password used by the 
caller determines which system capabilities are available to 
the caller.
Remote access on a private network
Nodes on the private network deliver the last dialed digits to 
the destination Norstar node, for interpretation by the 
destination Norstar node. The destination Norstar node either 
matches the digits to a target line or interprets the digits as a 
remote feature request. The call is either routed to the specified 
target line, or the remote feature is activated.
By default, E&M trunks are set to answer with DISA. For 
auto-answer E&M trunks connected to a private network, 
change the default so that the trunks are not answered with 
DISA. If an auto-answer E&M trunk is configured to answer 
with DISA, the system tries to interpret any received digits as 
a COS password.