Method for allocating incoming-call to extension telephone...

Details Method for allocating incoming-call to extension telephone... Method for allocating incoming-call to extension telephone...

H - Electricity

04

M

344/15

H04M 3/54 (2006.01) H04Q 3/42 (2006.01)

Patent

CA 2013915

In an integrated services digital network (ISDN), a caller number indicative of the telephone number of a caller can be usually attached in a call data. In a private branch exchange according to the present invention, the caller number of a caller and the extension number or numbers of an extension telephone set or sets to which the call is desired to be directly sent from the caller are previously registered in a suitable memory table in a predetermined correlation, so that when the private branch exchange receives a call from the ISDN, it retrieves the table to check whether or not the received call is previously registered in the table in the form of a caller number. When the call is registered one, the call is preferentially allocated to one or ones of the extension telephone sets having one or ones of the extension numbers associated with the caller number of the received call. The number registration in the table may be carried out through each of the extension- telephone sets.

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