Appeal No. 2001-2055 Page 2
Application No. 08/750,870
Figures 1a and 1b of the appellants' specification depict their conception of
"known techniques for IN call set-up. . . ." (Appeal Br. at 4.) As shown thereby, when a
user has a call or other service request, a communications connection is established
between the user's terminal 1 and a switch 2 via communications link 4. The
connection can carry both signaling and call traffic. If a request requires further
processing, the switch 2 directs the request to a service control unit 3 (step 23) via a
control link 6. The service control unit 3 provides the further processing required to
complete the call request or to perform some other service request (step 24).
When the switch 2 requests further processing from the service control unit 3,
the latter may fail the call and cause the switch 2 to release the communication
connection due to a service mismatch, customer specific service (e.g., outgoing calls
barred), or called party terminal state (e.g., a busy condition). Consequently, besides a
signaling channel, a traffic channel will have been connected on the communications
link 4 from the user terminal 1 to the switch 2 and in the switch 2 itself, and then not
used. Because the traffic channel was allocated to the failed call attempt, it could not
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