Method and arrangement for untrapping an unsuccessful call

Details Method and arrangement for untrapping an unsuccessful call Method and arrangement for untrapping an unsuccessful call

1997-02-18

1999-03-16

Wolinsky, Scott

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379207, 379219, H04M 342

Patent

active

058839518

ABSTRACT:
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.

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