Verfahren und Anordnung zum Umgang mit Telefonanrufen

A method and apparatus for allowing a calling subscriber, who sent a call request including an address in an attempt to place a call to a called subscriber, to untrap an unsuccessful call due to the called subscriber being busy or unreachable. In a first procedure, before completion of the call is a...

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Bibliographic Details
Main Authors DOE, STEPHEN RICHARD, PORTSLADE, BRIGHTON, EAST SUSSEX, GB, MANNBY, JAN-OLOF, HOVE, EAST SUSSEX, GB
Format Patent
LanguageGerman
Published 30.10.1997
Edition6
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Summary:A method and apparatus for allowing a calling subscriber, who sent a call request including an address in an attempt to place a call to a called subscriber, to untrap an unsuccessful call due to the called subscriber being busy or unreachable. In a first procedure, before completion of the call is attempted, it is determined from the address included in the call request whether the network to which the call is directed is one which traps calls. If so, the calling subscriber is informed on how to untrap the call should the call be unsuccessful. In a second procedure, a determination is made as to whether a call is unsuccessful, if the time period between receiving an Address Complete Message (ACM) and an Answer Message (ANM) from a network that traps calls is less than a very short predetermined threshold (e.g., 0.5 seconds), indicating that the call could not have been answered by a human subscriber.
Bibliography:Application Number: DE19971006110