Nortel Networks NN43001-106 - Manual (Page 417)

Feature description 417
Figure 7
Supervisory signals (NT400/500 method)
Calling and called number information
The called number information always includes the Directory Number (DN)
dialed (typically seven or ten digits). The information can also include the
toll access code (typically 0 or 1). Multifrequency (MF) sending includes
additional control signals such as KP (preparatory digits) or ST (end of
pulsing).
The calling number information is always sent in MF. It consists of a calling
Directory Number (always seven digits), the preparatory and end-of-pulsing
signals and other auxiliary signals. For example, an information digit with
the Bell method and class mark and category digits with the NT methods.
Each customer system is assigned a three-, four-, or five-digit Automatic
Number Identification (ANI) Listed Directory Number that identifies the
customer to the toll office. The calling number for ANI is obtained by
combining the ANI LDN with one of the following:
• Analog (500/2500 type) telephone: Directory Number (DN) of the
telephone
Nortel Communication Server 1000
Features and Services - Book 1 of 6 (A to B)
NN43001-106 01.04 Standard
Release 5.0 27 July 2007
Copyright © 2007, Nortel Networks
.