Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1991-11-25
1993-08-03
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379 93, 379 94, 379210, 379211, 379231, 3701101, H04M 700, H04M 1100, H04M 342, H04J 312
Patent
active
052336484
ABSTRACT:
A direct dialing-in method in a PABX is disclosed. In this method, a called party number translation table storing a plurality of pairs of first and last addresses for defining address groups, each constituted of a predetermined number of serial numbers, and specified addresses set for all kinds of terminals, at each group, is prepared. A called party number is extracted from the called party number information element of a SET UP message from a central exchange in ISDN having received a direct dialing-in number. It is checked with the aid of the translation table which of the address groups includes the called party number. The called party number is converted into a relative address in an address group including the called party number. The kind of a terminal on a call side is judged from the bearer capability information element and the high layer compatibility information element of the SET UP message simultaneously with the determination of the relative address. A specified address corresponding to the kind of the terminal is read out from the called party number translation table, and the read-out, and the specified address is added to the relative address, to obtain the extension number of the terminal.
REFERENCES:
patent: 4958153 (1990-09-01), Murata et al.
patent: 5033079 (1991-07-01), Catron et al.
patent: 5099511 (1992-03-01), Matsumoto
Dwyer James L.
Hong Harry S.
Matsushita Electric - Industrial Co., Ltd.
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