TELECOM Digest     Sat, 17 Mar 90 10:50:00 CST    Special: CLASS Phone Features

Inside This Issue:                               Moderator: Patrick A. Townson

    CLASS Phone Features [Chris Ambler]


Date: Thu, 15 Mar 90 16:13:56 -0800

From: Fubar 

Subject: CLASS Phone Features

        No. 1/1A ESS                             Div. 3, Sec. 1z(3)

        Corporate Software Standards             Draft Issue 3/12/90




        1.0   INTRODUCTION




              AT&T developed a set of 1A ESS revenue generating

              features called LASS (Local Area Signaling Services).

              Pacific Bell requested customized software enhancements

              for some of the features, and will refer to them as CLASS

              (Custom Local Area Signaling Services).  Documentation

              may refer to either acronym.


              The CLASS features allow increased customer control of

              phone calls.  Existing customer lines can be used to

              provide call management and security services.  The

              primary basis of CLASS is that the terminating office can

              obtain the identity of the calling party.  Special

              terminating treatment based on the identity of the

              calling party can then be provided.


              The CLASS features are dependent upon an SS/CCS

              (Signaling System 7/Common Channel Signaling) network and

              use the SS7 Call Management Mode of operation.  SS7 is

              the next generation signaling system that features

              flexible message formatting, high speed data transmission

              (56/64 kbps) and digital technology.  CCS is defined as a

              private network for transporting signaling messages.  In

              the existing voice and signaling network, signaling and

              voice use the same path but cannot use it at the same

              time.  With SS7, signaling and voice have been

              separated.  Signaling (SS7) is over a high-speed data

              link which carries signaling for more than one trunk.

              Refer to Corporate Software Standards, Division 3,

              Sections 1z(1) and 1z(2) for more information on SS7/CCS.


              In the initial deployment, the CLASS features will only

              work on intraLATA calls that are originated from and

              terminated to switches that are SS7 capable.


              Although CLASS features will be marketed and sold under

              the Commstar Custom Calling Feature label, the features

              will not be available for Centrex and Commstar II

              customers initially.  However, like the other Commstar

              features, most of the CLASS services can be added to

              existing telephone equipment and will work on Touch Tone

              or Rotary sets.  


              The Tracking Code (TC) for installation, translation and

              trunk work associated with CLASS is 299.  All time spent

              on CLASS should be coded to the TC in order to ensure

              proper time reporting.




              This document is being issued in order to incorporate

              Methods and Procedures with Corporate Software Standards

              for the CLASS features.  


              Subsequent changes to this document will be noted with a



        1.03  DESCRIPTION


              Seven features, plus Number ID Blocking, Screen List

              Editing, and Line History are available with the initial

              deployment of CLASS in the 1A ESS.  Pacific Bell renamed

              the AT&T features;  Bellcore has their own feature

              names.  Documentation may refer to any of the names as

              noted below.


              Pacific Bell   AT&T                  BELLCORE

              ------------   ----                  --------

              Call Block     Selective Call        Selective Call

                             Rejection (SCR)       Rejection      


              Call Return    Automatic Callback    Auto Recall



              Call Trace     Customer Originated   Customer Originated

                             Trace (COT)           Trace


              Number ID      Individual Calling    Calling Number

                             Line ID (ICLID)       Delivery


              Number ID      Privacy               Calling Number

              Blocking                             Delivery Block


              Priority       Distinctive Alerting  Distinctive Ringing/

              Ringing        (DA)                  Call Waiting


              Repeat         Automatic Recall      Auto Callback

              Dialing        (AR)


              Select Call    Selective Call        Selective Call

              Forwarding     Forwarding (SCF)      Forwarding


              NOTE:  Bulk Calling Line ID (BCLID) will not be offered

              with the initial deployment of CLASS features.


              Following is a brief description of the CLASS features as

              well as Line History and Screen List Editing.


              CALL BLOCK     The Call Block feature allows the customer

                             to not receive, or block, calls from a

                             pre-specified list of telephone numbers.

                             The telephone numbers are placed on a Call

                             Block Customer's Screening List.  When the

                             calling telephone number matches a number

                             on the screening list, the calling party

                             receives a rejection announcement.  The

                             customer blocking the calls (called

                             number) does not receive any indication

                             that a call was made.


                                  Activation Code:    *60

                                  Deactivation Code:  *80


              CALL RETURN    When activated, the Call Return feature

                             initiates a call to the last telephone

                             number who called the subscriber.  If the

                             calling number is idle, the call completes

                             immediately.  If the calling number is

                             busy, the request is queued until the line

                             is idle or he request times out.  This

                             feature can be used to re-establish a

                             previous incoming call, or to contact a

                             party who called while the customer was



                                  Activation Code:    *69

                                  Deactivation Code:  *89


              CALL TRACE     Call Trace allows the called party to

                             initialize an automatic trace of the last

                             incoming call received.  When the customer

                             activates a trace, a message containing

                             the following information is output to the

                             SCC Maintenance Channel:


                                  1.   Time the trace was activated

                                  2.   DN of the calling party

                                  3.   MLHG/multiline indicator

                                  4.   DN and LEN of the customer 

                                         requesting the trace

                                  5.   Date and time of the TTY message

                                  6.   Date and time the call being 

                                         traced was received

                                  7.   Privacy Indicator

                                  8.   CWT Indicator


                                  Activation Code:  *57

                                  No Deactivation Code required


              LINE HISTORY   Line History provides memory to store the

                             Last Call Directory Number (LCDN), service

                             routines to access the memory and logic to

                             retrieve the LCDNs.  Only the LCDN of the

                             most recent originating and terminating

                             call is saved.  A permanent Line History

                             Block is maintained for each line in a

                             CLASS office.  The LCDN is used in all

                             CLASS features.


              NUMBER ID      The Number ID feature enables the customer

                             to identify the calling party before the

                             call is answered.  After the first ring,