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The diagram below shows how TAT reduces the line 
requirements. The solid line shows Telephone A calling 
Telephone B and being transferred over an additional PRI line 
to Telephone C. With TAT active, the same call is transferred 
to Telephone C over the same PRI line.
Call paths with and without TAT
MCDN voice mail/auto attendant call features
Besides the general MCDN features described in MCDN trunk 
call features on page 133, an MCDN connection with a 
Meridian 1 with attached voice mail system, also provides 
some special call features, as described below.
Note:  Although these features have the same functions as 
Camp-on and Priority calls within each Norstar 
system, MCDN camp-on and break-in from M1 can 
access all network telephones connected to the 
centralized voice mail system. 
MCDN Meridian 1 attendant MCDN features
Meridian attendant featurescamp-on
break-in
Norstar
Te l e p h o n e  A
Te l e p h o n e  B
Te l e p h o n e  C
For warded call (using TAT) For warded call (no TAT)
Norstar 
						

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To all Norstar systems on the private network, the 
centralized voice mail system is viewed as an external 
call by each system, even though the dialing plan 
configurations makes it seem like callers are making 
local calls.
Camp-on
A call received by the Meridian attendant can be assigned to a 
telephone anywhere in the MCDN network, when the 
following situations are valid:
the target telephone rings busy when the attendant calls
no free keys on target telephone
DND regular feature is inactive
DND on busy feature is inactive
The target user sees that there is a call camped on the 
telephone. The called user can then clear a busy lines and take 
the call, or the user can choose to reject the call, using F814, 
or the user can indicate Do Not Disturb, using F85.
The diagram below demonstrates the call path for a Meridian 
attendant to camp a call on a telephone in the Norstar system. 
						

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Camping a call on a network telephone
Break-in
The Meridian attendant can break into an on-going call from a 
telephone in the Norstar system, if these situations are valid:
Target Norstar telephone is busy but still has a free 
intercom or line key.
DND busy is turned on, although the attendant can 
override a busy signal, if it is turned off, by pressing the 
BKI key.
Prime set also should be busy, with no free key, and with 
DND turned on.
Attendant capability is high (2), and higher than either the 
target telephone or the caller the target telephone owner is 
busy with.
A warning tone occurs for both parties on the call before the 
actual break-in occurs. 
Norstar
Meridian-based 
central attendant
Te l e p h o n e  A
(rings busy)Attendant
Call forwarded and camped on 
Te l e p h o n e  A
Line XXX Waiting
Incoming call 
for Telephone AMeridian 1 
						

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The diagram below demonstrates the call path for a Meridian 
attendant to break into a call between telephones in the Norstar 
system.
Breaking into a Norstar call path
Break-in can be accomplished using two methods:
Pre-dial BKI:
1. Attendant presses BKI button on telephone.
2. Attendant dials the destination number.
3. On receiving a busy signal, the Attendant presses BKI 
again.
The attendant is given access to the conversation.
Post-dial BKI: Attendant:
1. Attendant dials destination number.
2. If a camp-on or busy tone is heard, the attendant presses 
the BKI button on the telephone.
The attendant is given access to the conversation.
NorstarMeridian 1
Te l e p h o n e  A
(rings busy)
Attendant
Incoming call 
for Telephone ATe l e p h o n e  B
Break-in path 
						

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You can set a level of priority that will determine if a telephone 
will allow an attendant to break in. This is referred to as setting 
the Intrusion level. 
How the intrusion hierarchy works:
Break-in allowed if Attendant telephone is High and caller 
telephone is Medium. 
Break-in is not allowed if Attendant telephone is Medium 
and caller telephone is high.
Set the Intrusion level for each telephone under Capabilities. 
1. At Terminals&Sets, press ≠ and enter the DN 
number for the telephone to which you want to add 
intrusion levels. 
The telephone displays : or 
.
2. Press ≠. The display shows Line Access.
3. Press ‘ until you reach Capabilities.
4. Press ≠. The display shows Fwd no answer.
5. Press ‘ until you reach Intrusion.
6. Press ≠. The display shows Protect lvl.
7. Press CHANGE
 to select None, Low, Med, or High. 
						

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Central voice mail and Auto Attendant with Norstar
You can use Norstar voice mail (NVM) and Auto Attendant 
running on a Norstar Application module (NAM) platform as 
the central voice mail/auto attendant node for your MCDN 
network. However, this configuration does not allow 
centralized camp-on or break-in, since these are Meridian-
voice-mail-based features. 
Using NVM requires that all nodes on the network are set up 
with the CDP dialing rules. You can have a maximum of 10 
nodes on a Norstar-based network if you use all three DTI 
cartridges.
Note:  Ensure you have the latest version of NVM if you want 
to set up this type of centralized system.
Configuring centralized voice mail
System configuration for centralized voice mail depends on 
where the NAM is connected. The system with the NAM is 
configured using the voicemail DN and a target line. The 
systems that are remote to the NAM are configured through 
the Telco features sections.
Installation instructions about installing Norstar voice mail as 
a centralized voice mail system, are explained in the 
addendum titled:  Installing Norstar Voice Mail as a 
Centralized Voice Mail System . This addendum includes 
details about voice mail configuration as well as the Norstar 
M odular  I C S con figu ration that is included in the  following 
sections. 
						

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Local system
To set up the local system, you need to assign a target line to 
the DN for the voice mail system, then enter that DN into the 
target line record.
1. After you enter your password, at the Terminals&Sets 
prompt, press ≠. 
The prompt displays: Show set: 
2. Enter the DN number for the voice mail system.
3. Press ≠. The prompt displays Line access.
4. Press ≠. The prompt displays Line assignment.
5. Enter the target line number for your voice mail system. 
6. Press CHANGE
 to change the setting for each line to one of 
the following: Unassigned, Ring only, Appr&Ring, and 
Appr only. 
7. Press – until you reach the top level, then press 
‘. The prompt displays Lines.
8. Press ≠. The prompt displays Show line.
9. Enter the target line number you entered in step 5.
10. Press ≠. The prompt displays Trunk/line data.
11. Press ≠. The prompt displays Line Type.
12. Press ‘. The prompt displays Rec'd #.
13. Enter the DN for the voice mail system.
14. Exit programming. 
						

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Remote system
On the nodes that are not directly connected to the central 
voice mail system, you need to use the Telco Features 
headings to identify the route to the voice mail system.
1. After you enter your password, press ‘ until the 
prompt displays Telco Features: 
2. Press ≠. The prompt displays VMsg Center 
tel#s.
3. Press ≠. The prompt displays VMsg Center 1.
4. Press ≠. The prompt displays Use:.
5. Press CHANGE
 to until you reach Routing tbl. 
6. Press ‘. The prompt displays Tel #:.
7. Enter the number to access the external voice mail system.
Set Telco features for the VM DN
1. Press – until you reach the top level, then press 
‘ until the prompt displays Terminals&Sets.
2. Press ≠. The prompt displays: Show set: 
3. Enter the DN for the voice mail system.
4. Press ≠. The prompt displays Line access.
5. Press ‘ until the prompt displays Telco 
features.
6. Press ≠. The prompt displays Feature Assign.
7. Press ≠. The prompt displays Show line.
8. Enter the line number that connects to the system for the 
central voice mail system.
9. Press ≠. The prompt displays Caller ID Set. 
						

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10. Press ‘ until the prompt displays Extl VMsg 
set.
11. Press CHANGE
 to select Y (yes). 
Set Telco features for the target line
1. Press “ until you reach the top level, then press 
‘ until the prompt displays Lines.
2. Press ≠. The prompt displays: Show line: 
3. Enter the target line number for the voice mail system.
4. Press ≠. The prompt displays: Trunk/line 
data: 
5. Press ‘ until the prompt displays Telco 
features.
6. Press ≠. The prompt displays VMsg Center 1.
7. Press ≠. The prompt displays Use:.
8. Press CHANGE
 to until you reach Routing tbl. 
9. Press ‘. The prompt displays Tel #:.
10. Enter the number to access the external voice mail system.
11. Exit programming.
Using centralized voice mail
If you use NVM, ensure that you provide the correct user cards 
for system access. Users with telephones connected to the 
Meridian or Norstar unit on which NVM is installed, use 
internal voice mail feature codes to use the system (F981, and 
so on). Users on other nodes of the system, use the remote 
access codes, which are similar to the codes they would use if 
the central voice mail system was the Meridian-based system. 
						

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Note:  Meridian mail and Norstar voice mail can co-exist on 
the same Meridian, however, users can only be 
configured for one of the systems.
Configuring Centralized Auto Attendant (CAA)
System configuration for centralized Auto Attendant depends 
on where the NAM is connected. The system with the NAM is 
configured using the CAA DN and a target line. The systems 
that are remote to the NAM are configured through the Telco 
features sections.
All nodes must have a unique Private Network Identifier 
(PNI), which is defined under Dialing Plan. On each node, as 
well, the PNIs of adjacent nodes are programmed under 
Hardware.
Assigning PNIs
1. After you enter your password, press ‘ until the 
prompt displays System Prgrming: 
2. Press ≠. The prompt displays Hunt groups.
3. Press ‘ until the prompt displays Dialing Plan.
4. Press ≠. The prompt displays Private Network.
5. Press ≠. The prompt displays Type.
6. Press CHANGE
 to until you reach CDP. 
7. Press ‘. The prompt displays PrivNetID.
8. Enter the private network ID for your system.