Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1993-01-19
1995-12-05
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
379115, 379130, H04M 1500
Patent
active
054736307
ABSTRACT:
Interexchange carriers make their rate information for long-distance service available in a database. PBXs and telephone central offices access that rate information using ISDN and/or SS7 signaling and use it as a basis for determining which carrier to use at any given time in the routing of a call. Such accessing may be carried out on a call-by-call basis. Or a carrier's schedule of rates can be stored locally in the PBX or local switching office, thereby obviating the need for a database query for every call.
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Penzias Arno A.
Young Joel K.
AT&T Corp.
Chin Stephen
Loomis Paul
Slusky Ronald D.
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