Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1997-04-07
1999-09-07
Hong, Harry S.
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379201, 379229, 379243, 379246, 379251, H04M 700, H04M 342, H04M 300
Patent
active
059498730
ABSTRACT:
A method of operating a communication switching system in conjunction with a PBX comprising: storing at the PBX equipment station identifiers in association with directory numbers, storing at the switching system the station identifiers in conjunction with the directory numbers and a PBX identifier, in the event of a station connected to the PBX going offhook, looking up at the PBX a station identifier associated with a directory number assigned to the offhook station, transmitting the looked up station identifier to the switching system, and upon receiving the transmitted station identifier at the switching system, looking up the corresponding directory number, and changing characteristics of a line between the switching system and the PBX over which communication is to take place, to suit predetermined characteristics based on the corresponding directory number.
REFERENCES:
patent: 4064372 (1977-12-01), Altenburger
patent: 4086438 (1978-04-01), Kahn et al.
patent: 4796290 (1989-01-01), Perry
patent: 4825463 (1989-04-01), Miura
patent: 5249222 (1993-09-01), Pinard
Hong Harry S.
Mitel Corporation
LandOfFree
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