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]
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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
CUSTOM LOCAL AREA SIGNALING SERVICES (CLASS)
1.0 INTRODUCTION
1.01 GENERAL INFORMATION
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.
1.02 REASON FOR ISSUANCE
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
(AC)
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
unavailable.
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,