AT&T AT&T manual Call Accounting

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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The remainder of this subsection is dedicated to

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 a c c o u n t c o d e s w i t h t h e i r c a l l s , w h e n n e c e s s a r y . 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.

coverage of SMDR and CAS.