1043 Automatic Callback

Automatic Callback (CLASS sm) feature is an outgoing call management feature 
that allows the customer to automatically place a call to the last number 
called.  It does not matter whether the last number called was busy or idle, 
answered or unanswered.  If the called line is busy, the called line will be 
checked periodically and the customer will be notified by a special ring when 
the called line becomes idle.  The customer can use the phone for incoming and 
outgoing calls while waiting for the special ringback.  This capability requires
that both the originating and terminating central offices be equipped with 
Common Channel Signaling (CCS) SS7 and be interconnected by SS7.

CLASS is a service mark of Bell Communications Research, Inc.

Generic Name of ONA Service	Product Name	BSE or CNS
===========================================================================
Automatic Callback	AM - Repeat Dialing	CNS	
			BA - Repeat Call   	CNS
                  	BS - Repeat Dialing	CNS
			NX - Repeat Call	CNS
                  	PB - Repeat Dialing	CNS or BSE
                  	SWB - Call Cue(R)	CNS
                  	USW - Continuous Redial	CNS

Call Cue is a registered trademark of Southwestern Bell Telephone.

FEATURE OPERATION:
The customer must contact the telephone company to initiate Automatic Callback
service.  A service order is required.  Once the appropriate translations have 
been made to the customer's line, the customer may activate the service by using
the service access code *66 (1166 for rotary dial), and may deactivate the 
service, to cancel any outstanding Automatic Callback requests, by using *86 
(1186 for rotary dial).

Upon activation of Automatic Callback the called line is checked for
busy/idle status and class of service.  If the called line is idle and
the class of service is permissible, call setup is attempted.  If the called
line is busy, the customer receives an announcement stating the called line
is busy and the line will be checked periodically for busy/idle status.
When the line becomes free the customer will hear a special ring.  Upon
answering the special ring, one of the following happens:

1. Call setup is attempted, the customer hears audible ringing while the
   called party receives power ringing.  Or

2. The customer receives an announcement indicating the following:

- 1A ESS & 5ESS:  The called line has become busy again, hang up and try your 
  call again.  (This terminates Automatic Callback for this activation.)  The
  customer can reactivate Automatic Callback by again using the service
  access code.

- DMS-100:  The called line has become busy again, monitoring of the line
  will resume, hang up and wait for the special ringback.  

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*	5E5	BCS28

Note: * Available on intraoffice basis with generic 1AE9.

2. The serving central office switch must be equipped with the appropriate
   CLASS Automatic Callback 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.  This service is only offered on an
   intraLATA basis at this time.

3. 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 that have denied originating treatment and
   multiline hunt groups that cannot have ringback directed to the calling
   station.  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).

4. The special ringing that the customer hears when call setup is being
   attempted consists of 2 short rings and 1 long ring in 6 seconds.  Some
   telephone companies use this pattern for more than one service.

5. There are some digital loop carrier plug-ins that will not transmit
   the required special ringing.

6. The customer can have multiple Automatic Callback activations in effect
   concurrently.

7. Automatic Callback cannot be activated towards a line that has Call
   Forwarding Variable or Selective Call Forwarding activated.  If the service 
   cannot be activated, the caller is routed to a denial announcement or tone.

8. In some electronic key sets, power ringing generates a preset ringing
   pattern regardless of the ringing pattern generated by the originating
   central office.  Therefore customers with these electronic sets may not be
   able to differentiate regular ringing for incoming calls from the special
   ringing for Automatic Callback.

9. The length of time the called line is monitored for busy/idle status is
   a telephone company settable parameter ranging from 16-45 minutes.
   The interval is set on a per switch basis and is generally the same
   throughout a regional company.

10. The customer can use the telephone for incoming and outgoing calls while
    waiting for the special ringback.  However, the special ringback will not
    be attempted while the customer is using the telephone.

11. References:
 o LSSGR (TR-TSY-000064), FSD 01-02-1250 (place holder only).
 o TR-TSY-000215 CLASS Feature: Automatic Callback, Issue 1, September 1988. 

This service, if offered as a BSE, is associated with the Circuit Switched
Line basic serving arrangement.
