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CALL ACCOUNTING
Call Accounting is the collecting, processing, and use of information about all trunk calls
placed from and received by System 25. It is intended to help customers control telephone
use and manage associated costs.
Detailed call data is available at Interface Port 3 of the Digital Switch’s Call Processor
Circuit Pack. This data can be fed to one of the following peripheral equipment systems:
Station Message Detail Recording (SMDR) equipment for printing a standard call
.
report.
● A Call Accounting System (CAS) for preparing a variety of cost estimate reports and
for providing management and directory type services.
Two station features of System 25 are also related to Call Accounting and are covered in
separate subsections of this manual.
Account Code Entry allows individual voice terminal
users to associate specific
account codes with their calls, when necessary.
Call
Accountability provides users with the means to properly identify calls they make from
stations other than their own. The information gathered from these two features is part of
the data output from the processor to the SMDR or CAS.
The remainder of this subsection is dedicated to coverage of SMDR and CAS.
Station Message Detail Recording (SMDR)
Description
SMDR records detailed call information on all incoming and outgoing (external) calls and
sends this information to an (optional) output device.
Data on inside calls is not collected.
The call records can be used to compute costs, allocate charges, and analyze calling patterns.
The output device can be any serial RS-232 compatible DTE device capable of receiving the
data (must supply DTR on pin 20) and either printing the call records or storing and
analyzing them. (80 character ASCII records are sent to the output device.)
The SMDR RS-232 port interface is provided by a DUART driver (68681). It is a one-way
port transmitting data to the output device.
No characters are read by the port interface,
and no flow control mechanisms are provided. The standard data transmit rate is 1200 bps.
(Also operates at 300 bps.)
Call Records
The call records provide detailed information concerning both incoming and outgoing calls.
Call detail records are generated during call processing and are sent to the SMDR output
device in ASCII format. SMDR records are provided for:
.
Voice Records: The system prints call records for incoming calls and for outgoing
calls that exceed a specified duration. For special types of calls such as conference
or transferred calls, one call record is reported for each trunk seized, regardless of
the number of parties connected to the call. The call’s duration is from the time the
last digit was dialed until the last person hangs up.
No indication is provided that
trunks have been bridged together.
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