1047 Call Forwarding - Busy Line Interswitch

Call Forwarding Busy Line (CFBL) is a central office software capability that
allows a client to have an incoming call redirected to another Directory
Number (DN) if the number dialed (the client's number) is in a busy condition.
The service is activated by a service order.  A call forwarded due to a busy 
condition would always forward to the preprogrammed number (selected at the time
of the service order).  The called number and the redirected number may be in 
the same or in different central office switches.  The service is deactivated 
or the preprogrammed number is changed by a service order.

Generic Name of ONA Service
 	Product Name						BSE or CNS
===========================================================================
Call Forwarding - Busy Line Interswitch
	AM - Busy Line Transfer					CNS 
	BA - Fixed Call Forwarding				CNS
        BA - Call Forwarding Busy Line/Don't Answer		CNS
       	BS - Call Forwarding Busy Line 				CNS
       	NX - Call Forwarding 2 					CNS or BSE
       	PB - Busy Call Forwarding Extended			CNS
       	SWB - Call Forwarding Busy Line				CNS 
       	USW - Call Forwarding Busy Line (Expanded)		CNS
       	USW - Call Forwarding Busy Line/Don't Answer (Expanded)	CNS

FEATURE OPERATION:
This feature is activated/deactivated by a service order.  The "forward to" 
number is also selected and preprogrammed at the time of the service order.
(Refer to the capabilities called "Call Forwarding - Busy Line or Don't 
Answer - Customer Control of Activation/Deactivation" and  "Call Forwarding - 
Busy Line or Don't Answer - Customer Control of Forward-To Number"
for the services with customer control.)

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	1AE10.09* 	5E2(2)	BCS24

* 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. Multiline customers can have CFBL on each line if desired.

3. Calls may be forwarded to any telephone number, including DID numbers,
   served by the same or a different central office.

4. Subscribers may have CFBL with Call Forwarding Don't Answer (CFDA), Call
   Forwarding Variable (CFV), and Call Waiting (CW).  If a station has CFV
   and CFBL or CFDA active, then CFV will override the CFBL and/or CFDA 
   features.  If a station has CW and CFBL, CW will normally take precedence 
   over the CFBL feature.  However, if the station is made busy by a make-busy
   key arrangement, CW is not invoked and the CFBL feature takes precedence.

5. References:
   o General reference for Call Forwarding Busy Line (interswitch): LSSGR
     (TR-TSY-000064), Section 4.2.  Definition only, Feature Number 01-02-1404
     Call Forwarding Busy Line, Issue 2, July 1987, Module TR-TSY-000500.
   o Also see FSD 01-02-0801 Series Completion, Module TR-TSY-000521.
   o Also see TR-TSY-000522, FSD 01-02-1450 Call Forwarding Subfeatures,
     Revision 1, August 1988.  

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