Nortel Meridian Meridian 1 Feature Description And Administration page 1504

Page 1504 of 1814
553-2901-301 Standard 9.00 January 2002
Private to Public CLID Conversion
On ISDN trunks, Calling Line Identification (CLID) information is sent in the
Calling Party Information Element (IE) of the setup message. This
information is used to display the originating party's number on the
terminating telephone. A Call Type indicator is also present, to indicate to the
switch at the other end what type of call it is receiving (International,
National, Subscriber, UDP, CDP, SPN). This in turn affects how that switch
handles the call using the INAC prompt.
Originating nodes configure the format of the CLID using the following
components:
• the dialing plan used to make the call
• the type of trunk used for the call
• the Customer Data Block option and Class of Service of the telephone
related to sending the Prime DN (PDN) or Listed Directory Number
(LDN) of the telephone
For example, a call dialed with a Location Code (private Uniform Dialing
Plan), that is sent out on a private network trunk (TIE trunk) has a CLID in
the private network format (LOC+DN). However, a Location Code call that
is sent out on a public network trunk (a COT trunk, for example) has a CLID
in the public network format [National (NPA+NXX+DN)]. The public
network number can be the LDN of the customer group for non-DID
telephones or the NPA+NXX+DN for DID users.
If the default method for constructing Call Types is not suitable, the
administrator can program Digit Manipulation Indexes to apply to calls as
they leave the switch to change the Call Type indicator that travels with each
call.