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CLASS Phone Features by Chris Ambler (Telecom Digest)
CLASS Phone Features

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,

                             the calling party's DN is displayed on

                             customer premises equipment (CPE).  When

                             the calling party's location is not CLASS

                             equipped, or their telephone call is

                             marked private, a code will be appear on

                             the CPE display (e.g. '000-0000' or

                             'private' or 'out-of-area'); the display

                             is up to the CPE vendor.


                                  No Activation/Deactivation Codes are




              NUMBER         Number ID Blocking allows a customer to

              ID             make their telephone number private on a

              BLOCKING       per call basis by dialing an activation

                             code prior to the called number.  The term

                             'private' means that although the calling

                             number is sent to the far end, it is

                             marked private so that there will be no

                             ICLID display of the number; the calling

                             number can still be traced using Call

                             Trace and can also be added to screen



                             This capability is available to all

                             customers in a 1A ESS switch that has

                             CLASS, whether or not they have the Number

                             ID feature.


                                  Activation Code:   *67


              PRIORITY       This feature provides a distinctive ring

              RINGING        to the subscriber when incoming calls

                             originate from telephone numbers

                             pre-defined on a Priority Ringing List.

                             When the customer with Priority Ringing

                             receives a call and the calling number is

                             on the list, the called party receives:


                                  Special ringing tone if the called

                                  number is idle, or


                                  If the called customer has Call

                                  Waiting and is on a call, they will

                                  receive a special tone indicating

                                  that a number on their Priority

                                  Ringing List is trying to reach them.


                                  Activation Code:    *61

                                  Deactivation Code:  *81


              REPEAT         Upon activation, Repeat Dialing 

              DIALING        automatically redials the last otgoing

                             call dialed from the subscriber's line.

                             It does not matter whether the last call

                             dialed from the customer's line was busy

                             or idle, answered or unanswered.


                             Repeat Dialing is available to POTS and

                             multiline hunt customers as long as the

                             ring back can be directed to a particular

                             number on a unique LEN.


                             If a call cannot be completed immediately

                             due to a busy line, the customer receives

                             a confirmation tone, the call is queued

                             and recall completion is attempted when

                             both parties are idle.  The customer with

                             Repeat Dialing receives ring-back ringing

                             (2 short 1 long within six seconds) and

                             upon answering the called party receives

                             regular ringing.


                             Once Repeat Dialing has been activated,

                             the busy/idle status of the called and

                             calling lines is checked every 45 seconds

                             for 30 minutes.


                                  Activation Code:    *66

                                  Deactivation Code:  *86


              SCREEN LIST    Screen List Editing allows subscribers to

              EDITING        build and change the lists of telephone

                             numbers associated with the Call Block,

                             Select Call Forwarding and Priority

                             Ringing CLASS features.  When editing, the

                             subscriber may also hear the entries on

                             the list and obtain instructions.  A

                             screening list is activated when it is

                             initially created during feature

                             activation.  When the screening list is

                             active and has at least one number on it,

                             the corresponding feature is on.  


                             An individual list of DNs is required for

                             each feature that uses screening lists and

                             is associated with the customer's line.


              SELECT CALL    This feature automatically forwards

              FORWARDING     incoming calls from telephone numbers that

                             have been pre-defined on the subscriber's

                             Select Forwarding List.  Select Call

                             Forwarding is totally independent from

                             Call Forwarding Variable.  Separate

                             activations and 'forward to' numbers will

                             be required.  Both features may be

                             activated simultaneously.


                                  Activation Code:    *63

                                  Deactivation Code:  *83


              NOTE:     On Rotary sets, the '*' is replaced with '11'

                        on all activation/deactivation codes.




     Sig: ++Christopher();            | Fubar Systems BBS

Internet: cambler@polyslo.calpoly.edu | (805) 544-9234 3/12/24 8-N-1         

    Also: chris@fubarsys.slo.ca.us    | finger cambler@polyslo.calpoly.edu

     Bix: cambler                     | Home of the 13K .plan (and growing)


End of TELECOM Digest Special: CLASS Phone Features


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