Appeal No. 1999-1612
Application 08/614,188
there were complex problems with transmission of data on a
busy line still existing as of 1988, but provide no evidence
that a solution had been found.
We turn next to Bellcore ‘031, 1986 which represents
“Bellcore’s view of the generic requirements for CLASS
Feature: Calling Number Delivery.” The above cited passages 4
make clear that as of 1986, Bellcore viewed one requirement of
Calling Number Delivery (CND) to be transmission of a calling
party’s DN to a called party with Call Waiting service while
that called party was busy on another call. Section 3.8,
Interactions, presents Bellcore’s recommendation of how this
would be accomplished. The alerting tone of the Call Waiting
cycle would be used as an indication to the CPE of the called
party that an incoming data message would follow. The calling
party DN would then be transmitted during the silent interval
after the alerting tone. However, this same section takes
note of a problem with this procedure.
“The standard Call Waiting tone . . . . which is machine
readable (i.e., it could be detected by the CPE), may not
be satisfactory for this purpose. However, because of
its fairly short duration and because it consists of a
4See page ii of the reference.
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