Instruction manual

Electronic Switched Network Page 1389 of 3156
Features and Services
Call Back Queuing
Call Back Queuing (CBQ) is an optional feature available to systems
equipped with the Basic/Network Alternate Route Selection (BARS/NARS)
or Coordinated Dialing Plan (CDP) features. If all facilities are busy when an
individual places a BARS, NARS, or CDP call, Call Back Queuing (CBQ)
enables the individual to invoke the Ring Again (RGA) feature and receive a
callback from the system when a facility becomes available. Call Back
Queuing (CBQ) is described in detail in Network Queuing description or
Basic and Network Alternate Route Selection: Description (553-2751-100).
Call Back Queuing to Conventional Mains
Call Back Queuing to Conventional Mains (CBQCM) enables call originators
at a Conventional Main (any type of switch, including switches that are part
of an Electronic TIE Network [ETN]) to access the CBQ feature at the serving
ESN Node. When offered CBQ by the Node, users at the Conventional Main
dial their extension number to accept the CBQ offer. When facilities become
available at the Node, it initiates a CBQ callback to the call originator at the
Conventional Main. Refer to Network Queuing: Description (553-2751-101)
for a detailed description of Call Back Queuing to Conventional Mains
(CBQCM).
Coordinated Call Back Queuing
Coordinated Call Back Queuing (CCBQ) enables telephones eligible for Ring
Again (RGA) at the Main to be offered CBQ when network calls are blocked
at the serving Node. When facilities become available at the Node, the call
originator at the Main is alerted by a callback (identical to an RGA callback)
from the Node. Coordinated Call Back Queuing (CCBQ) requires that the
Main and associated Node be equipped with Network Signaling. Refer to
Network Queuing: Description (553-2751-101) for a detailed description of
Coordinated Call Back Queuing (CCBQ).