1068 Distinctive Ringing

Distinctive Ringing (CLASS) alerts a customer via a special ringing pattern
when receiving a call from a pre-specified list of directory numbers.  If
the customer is also a subscriber to Call Waiting service, and is off-hook
on a call, a special Call Waiting tone will be sent to the customer if the 
calling party's number is on the pre-specified list.

Generic Name of ONA Service 	Product Name			BSE or CNS
===========================================================================
Distinctive Ringing		AM - Distinctive Ringing	CNS
                           	BA - Priority Call		CNS
                           	BS - Call Selector		CNS
				NX - Ringmate			CNS
                           	PB - Priority Ringing		CNS 
                           	SWB - Priority Call(sm)		CNS
                           	USW - Priority Call		CNS

Priority Call is a service mark of Southwestern Bell Telephone Company.

FEATURE OPERATION:
The customer must contact the telephone company to initiate Distinctive Ringing
service.  A service order is required.  The customer initiates control of the 
Distinctive Ringing screening list contents as well as activation and 
deactivation of the service by dialing access codes as described below.  Once 
the appropriate translations have been made to the customer's line the customer
may activate, deactivate and/or use the service as follows:

1. 1A ESS: To activate the Distinctive Ringing service, the customer must go 
   off-hook and dial *61 (1161 for rotary dial).  The customer will then receive
   an announcement providing the following information:
   - The name of the service.
   - The service is now active.
   - The number of entries on the list.
   - The instructions for creating/adding numbers to the list, removing 
     subscribers entries from the list, reviewing the list.

2. To deactivate the service, the customer must go off-hook and dial *81 (1181
   for rotary dial).  The customer will then receive an announcement
   providing the following information:
   - The name of the service.
   - The service is now off.
   - The number of entries on the list.
   - The instructions for removing any subscriber list entry, removing all
     subscriber entered numbers.

3. 5ESS and DMS-100:  To activate or deactivate the Distinctive Ringing service,
   the customer must go off-hook and dial either *61 or *81 (1161 or 1181 for
   rotary dial).  Once either access code has been successfully entered, the 
   customer should receive an announcement providing the following information:
   - The name of the service.
   - The status of the service (active or inactive).
   - The number of entries on the list.
   - The instructions for creating/adding, removing, reviewing the list, 
     changing of service status (active to inactive, inactive to active).

TECHNOLOGICAL AND FEATURE INTERACTION CONSIDERATIONS:
1. This feature is available in the following central office switches:

Switch Type		 	1A ESS	5ESS	DMS-100	
Earliest Generic Release	1AE10*	5E6	BCS31**	

NOTE: * Available on an intraoffice basis with 1AE9.
** References to switching system generics that have not yet been released by 
   the vendors are based on our current information about which features are 
   planned for inclusion in those generic releases.  If the vendors change the 
   availability of any features for future generic releases that are referenced 
   in this document, the availability of some services may be affected.

2. The maximum directory number list size is pre-determined by the telephone 
   company on a company basis and can range from 2 to 31.

3. The serving central office switch must be equipped with the appropriate
   CLASS Distinctive Ringing/Call Waiting software and hardware.  In order
   for this service to work on an interoffice basis, both the originating and
   terminating switches must be equipped with the CLASS and Common Channel 
   Signaling (CCS) SS7 software and hardware and the interoffice trunks must 
   be converted to SS7.

4. This service is a "line" service and therefore cannot be assigned to
   subscribers with trunk terminations (i.e., PBX with DID).  This service is
   also unavailable to customers with the following types of lines: multiparty,
   hotel/motel, coin and coinless public, 1A ESS remote switching system 
   lines (RSS) and Centrex attendant with console.  In addition, because of
   the special ringing, this service may not work where channel banks (FX 
   service), MFTs or bridge lifters are used (depending on circuit design).

5. The ringing tone and the call waiting tone that a customer hears have
   a short-long-short pattern.  Some telephone companies use this pattern
   for more than one service.

6. There are certain digital loop carrier plug-ins that will not transmit the
   required distinctive ringing.

7. References:
   o TR-TSY-000219 CLASS Feature: Distinctive Ringing/Call Waiting,
     LSSGR (TR-TSY-000064) FSD 01-01-1110, Issue 2, November 1988.
   o TR-TSY-000220, CLASS Feature: Screen List Editing, Issue 2, April 1989.
