Nortel Meridian Meridian 1 Feature Description And Administration page 1507

If the call encounters "all trunks busy" on the TIE trunks to switch C at the
tandem node, switch B is programmed to alternately route the call out to the
CO. The calling number digits (3382020) are sent to the CO. The CO sees
seven digits and, if ten digits is a requirement, inserts the NPA of the serving
area around the tandem node, (408 in this example). When the call reaches
the destination, the display reads 4083382020. This CLID is not the correct
number for the originator. However, it is possible that the number is valid for
a subscriber in the 408 area code. When the terminating party attempts to use
the CLID for callback purposes, it can result in a call to someone in the 408
area code who did not originate the earlier call.
The Private to Public Calling Line Identification (CLID) Conversion feature
is applicable to Electronic Switched Networks (ESNs) that use the following
private network numbering plans and codes:
• Uniform Dialing Plan (UDP) and Location Codes (LOCs)
• Coordinated Dialing Plan (CDP) and Distant Steering Codes (DSCs)
A private format CLID can be in either of the following formats:
• LOC+DN
• DSC+X..X
The Private to Public CLID Conversion feature provides two different
options to send a public format CLID to the PSTN. The options are:
• CLID contains the NPA and NXX of the originating node. For
outgoing calls from the tandem node you translate location codes (LOC)
and/or Distant Steering Codes (DSC). For incoming calls from those
switches and CLID conversion purposes, you program the NPA and
NXX of each originating node to associate with its LOC or DSC at the
tandem node. The tandem node uses this NPA and NXX to build a public
format CLID for the originator when calls from that switch hop off to the
public network from the tandem node.
• CLID contains the LDN of the tandem node. You can use the LDN of
the tandem node for the public format CLID.
International ISDN PRI Feature description and administration
Private to Public CLID Conversion Page 1507 of 1814