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Node A Node E User in Calgary dials a 765-xxxx number.
DN type: Public
Node A receives it and identifies it as being for B. 
Uses private trunk to route call to B.
Incoming interface: Public
Destination: Remote node
Outgoing interface: Private
Node B receives it and identifies it as being for E. 
Uses private trunk to route call to E.
Incoming interface: Private
Destination: Remote node
Outgoing interface: Private
Node E receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
Node  A Node  C User in Calgary dials a 761-xxxx number which is 
answered with DISA. 
Incoming interface: Public
DN type: Public
Destination: Local (DISA DN)
User enters a COS password and a private DN 
for Node C 
i.e. 6 + 393-xxxx
DN type: Private
Node A receives it and identifies it as being for C. 
Uses the private trunk to route the call to C.
Incoming interface: (DISA user)
Destination: Remote node
Node C receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line) Received Destination Description 
						

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Node  A  Node  D User in Calgary dials a 761-xxxx number which is 
answered with DISA. 
Incoming interface: Public
DN type: Public
Destination: Local (DISA DN)
User enters a COS password and a private DN 
for Node D, i.e. 6 + 394-xxxx
DN type: Private
Node A receives it and identifies it as being for C. 
Uses the private trunk to route the call to C.
Incoming interface: (DISA user)
Destination: Remote node
Node C receives it and identifies it as being the 
responsibility of D. Uses private trunk to route call 
to D.
Incoming interface: Private
Destination: Remote node
Node D receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
Node A Ottawa 
PSTNUser in Calgary dials a 761-xxxx number which is 
answered with DISA. User enters a COS 
password and an Ottawa public network number.
Incoming interface: Public
DN type: Public
Destination: Local (DISA DN)
Node A receives it and identifies it as being for C. 
Uses the private trunk to route the call to C.
Incoming interface: Local (DISA user)
Destination: Remote PSTN
Node C receives the call and identifies it as a 
public number and routes it out over the local 
PSTN.
Incoming interface: Private
Destination: Local PSTN Received Destination Description 
						

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Calls originating in the private network
Received Destination Description
Node B Node B DN is internal, therefore no trunk routing is 
required.
Incoming interface: Intercom
DN type: Local
Destination: Local
Node A Ottawa 
PSTNUser in Node A dials the private network access 
code for Node C, followed by an Ottawa public 
number.
Incoming interface: Intercom
DN type: public
Destination: Remote PSTN
Node C receives the call and identifies it as being 
for the public network. Node C routes the call over 
the local public network.
Incoming interface: Private
DN type: Public
Destination: Local PSTN
Node B Calgary 
PSTNUser on Node B dials a public DN.
Node B recognizes it as being the responsibility 
of Node A and uses private trunk to route the call 
to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives the call and identifies it as being 
for the public network. Node A routes the call over 
the local public network.
Incoming interface: Private
Destination: Remote PSTN 
						

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Node B Node A User in Node B dials a private DN for a user on A.
DN type: Private
Node B recognizes it as being for Node A. Uses 
the private trunk to route the call the call to A.
Incoming interface: Intercom
Destination: Remote node
Node B receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
Node B Node C User on Node B dials a private DN for a user on 
C.
DN type: Private
Node B recognizes it as being the responsibility 
of Node A and routes the call over the private 
trunk to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives it and identifies it as being for C. 
Uses IP trunk to route call to C.
Incoming interface: Private
Destination: Remote node
Node C receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line) Received Destination Description 
						

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Node B  Node D User on B dials a private DN for node D.
DN type: Private
Node B identifies it as being for node A and uses 
private trunk to route the call to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives it and identifies it as being for C. 
Uses IP trunk to route call to C.
Incoming interface: Private
Destination: Remote node
Node C receives it and identifies it as being for D. 
Uses the private trunk to route call to D.
Incoming interface: Private
Destination: Remote node
Node D receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
Node B Node F User on B dials a private DN for node F.
DN type: Private
Node B identifies it as being for node A and uses 
private trunk to route the call to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives it and identifies it as being for C. 
Uses IP trunk to route call to C.
Incoming interface: Intercom
Destination: Remote node
Node C receives it and identifies it as being for D. 
Uses the private trunk to route call to D.
Incoming interface: Intercom
Destination: Remote node
continued on next pageReceived Destination Description 
						

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Routing for tandem networks
In tandem networks each node needs to know how to route 
calls that do not terminate locally. To do this, you set up routes 
for each connecting node by defining destination codes for 
each route.
If the node is also connected to the public network, the usual 
routing is required for that connection.
The following examples show the routing tables for Node A 
and Node C for externally-terminating calls.
Note: The PRI lines are enbloc lines, so all dialed digits are 
collected before being dialed out.
Node A Destination Code Table, external termination
Node B to Node F 
(continued)Node D receives it and identifies it as being for F. 
Uses the private trunk to route call to F.
Incoming interface: Intercom
Destination: Remote node
Node F receives the call and identifies it as 
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
RouteAbsorb lengthDestination code (public DNs)
4 (PSTN)191604
3 (Node B)091403762 (Node B)
3 (Node B)091403765 (Node E)
4 (PSTN)19140376* (not internal network)
4 (PSTN)1914037* (not internal network)
4 (PSTN)191403* (not internal network)
4 (PSTN)19* (not internal network)
* This wild card represents a digit between 1 and 9.Received Destination Description 
						

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Node A Destination Code Table, internal termination
Node C Destination Code Table, external termination
Node C Destination Code Table, internal termination
RouteAbsorb lengthDestination code (private DNs)
3 (Node B)0392 (Node B)
3 (Node B)0395 (Node E)
5 (Node C)0393 (Node C)
5 (Node C)0394 (Node D)
5 (Node C)0396 (Node F)
RouteAbsorb lengthDestination code (Public DNs)
3 (Node B)091613764 (Node D)
3 (Node B)091613766 (Node F)
4 (PSTN)19161376* (not internal network)
4 (PSTN)1916137* (not internal network)
4 (PSTN)191613* (not internal network)
4 (PSTN)19161* (not internal network)
4 (PSTN)1916* (not internal network)
4 (PSTN)191* (not internal network)
4 (PSTN)19 (not internal network)
* This wild card represents a digit between 1 and 9.
RouteAbsorb lengthDestination code (Private DNs)
3 (Node D)0394 (Node D)
3 (Node D)0396 (Node F)
5 (Node A)0391 (Node A)
5 (Node A)0392 (Node B)
5 (Node A)0395 (Node E) 
						

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Advanced Private Networking
There are two ways of setting up dialing plans for an 
Advanced Private Network (APN). 
• The first method uses routing tables to interconnected 
systems. This type of network may use SL-1 lines, but it 
does not use the MCDN protocol, even though the MCDN 
keycode is required to allow the use of PRI SL-1 lines. 
• The second method allows you to network among other 
Norstar systems, Meridian systems, and Business 
Communications Manager systems using SL-1 lines and 
the MCDN protocol. This system uses the private dialing 
plans in the same way as the Private Network Tandem 
Calling network does. However, if you are using a Norstar 
to support your central voice mail or call attendent, you 
must use a CDP dialing plan. The MCDN protocol 
provides additional features that support the central voice 
mail/Auto Attendant as well as system call routing.
Networking using routing codes
If you have a simple private network, composed of one central 
Meridian 1 and two smaller sites with Norstar systems, you 
can use routing codes to direct calls. The following example 
shows a Meridian 1, representing the head office, connected to 
several smaller branch offices.
In this network, only the head office has trunks connected to 
the public network. The branch offices access the public 
network via the private connection to the head office. This 
configuration allows for cost savings by consolidating the 
public access trunks. Users at all three locations access the 
public network by dialing 9, followed by the public number.  
						

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For example, a user in the west end branch might dial 9-555-
1212 (for a local call) or 9-1-613-555-1212 (for a long distance 
call). These public calls are routed to the Meridian 1 by the 
Norstar routing table. Routing tables at the Meridian 1 will 
then select an appropriate public facility for the call.
Private network calls are made by dialing a four-digit private 
network DN. For example, if a user in the west end branch 
wishes to call a user in the east end branch within the private 
network, they dial 6221.
Private networking using routing tables
Meridian 1Meridian 1
West end Branch
East-end Branch
Network #: 2221
    Recd #: 2221
 Internal #: 2221Network #: 6221
    Recd #: 6221
 Internal #: 6221
Meridian M1 PRI (SL-1)PRI (SL-1)
DN: 4221
Central
OfficePRI (public protocol)
West-end branchEast-end branch
Network #: 2221
Rec’d #: 2221
Internal #: 2221Network #: 6221
Rec’d #: 6221
Internal #: 6221
PRI SL-1PRI SL-1Meridian M1
DN: 4221
PRI (public protocol)
Central 
Office 
						

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Routing network settings
West End:
HardwareCard 1PRI
ProtocolSL-1
BchanSeqAscend
ClockSrcPrimary
Trk/Line DataLine 245Target line
Rec’d #2221
Line AccessDN 2221L245:Ring only
Line pool accessLine pool PRI-A
To Head Office:
Routing ServiceRoute001
DialOutNo numbr
UsePool PRI-A
DN typePrivate
DestCode4
Normal rte001
Absorb0
To East End:
Routing ServiceDestCode6
Normal rte001
Absorb0
To Public Network:
Routing ServiceRoute002
DialOutNo numbr
UsePool PRI-A
DN typePublic
DestCode9
Normal rte002
Absorb0