Private branch exchange and line exchange method

Details Private branch exchange and line exchange method Private branch exchange and line exchange method

1992-08-14

1994-03-01

Dwyer, James L.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379212, 379213, 3701101, H04M 302

Patent

active

052915492

ABSTRACT:
A private branch exchange which accommodates a plurality of extension terminals and which is arranged to effect line exchanges by specifying a destination terminal from among the extension terminals on the basis of a called-subaddress information element contained in incoming information. When the incoming information containing the called-subaddress information element is received, it is determined whether the called-subaddress information element is contained in the incoming information. If there is no called-subaddress information element, the call is refused. It is also determined whether connection with an extension terminal is possible or impossible, on the basis of the received incoming information. If the connection is impossible, information to that effect is transmitted to a calling party.

REFERENCES:
patent: 4277649 (1981-07-01), Sheinbein
patent: 4696028 (1987-09-01), Morganstein
patent: 4958153 (1990-09-01), Murata et al.
patent: 4975941 (1990-12-01), Morganstein et al.
patent: 5001709 (1991-03-01), Sato
patent: 5008884 (1991-04-01), Yazawa et al.
patent: 5023868 (1991-06-01), Davidson et al.
patent: 5027384 (1991-06-01), Morganstein
patent: 5099511 (1992-03-01), Matsumoto
"SR 1000 PBX", product Reference Guide by Solid State Systems Inc., p. 13, Nov. 1987.

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