Telephonic communications – Special services – Repetitive call attempts
Patent
1997-02-11
1999-12-28
Hong, Harry S.
Telephonic communications
Special services
Repetitive call attempts
370259, 370271, 370524, 379230, H04M 348, H04Q 1104, H04J 312
Patent
active
060091576
ABSTRACT:
Telephone terminals directly implement an automatic call back feature by establishing a logical channel between two telephone terminals when a calling telephone terminal is unable to complete a call to a called telephone terminal. Via the logical link, the called telephone terminal communicates to the calling telephone terminal any change in state that is related to its ability to receive a call. When both telephone terminals are idle, the calling telephone terminal recalls the called telephone terminal to set up a call. The logical link is established on user-user temporary signaling or D channel facilities of ISDN links. Since the interconnecting networks are not part of providing the automatic call back service, the telephone terminals can be interconnected by any combination of telephone networks that provide ISDN service.
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Bales Bruce Merrill
Thieler Stephen Max
Hong Harry S.
Lucent Technologies - Inc.
Moran John C.
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