Patent ID: 6625275
Filing Date: 2003-09-23
Classification: H04M,H04Q

Abstract:
A private branch exchange network system connected to a telephone network comprising a plurality of private branch exchanges connected to each other with a communication line and accommodating a plurality of extension telephones, respectively through a private line, each of said private branch exchanges comprising:first means for detecting an incoming call arriving through said telephone network and queuing said incoming call in a reception sequence queue common to said plurality of private branch exchanges; second means for scanning a distribution sequence queue supporting an extension group including an extension telephone accommodated by each of said private branch exchanges to select one of said extension telephones so as to equalize load; and third means for connecting said incoming call to the selected one of said extension telephones when the one of said extension telephones selected by said second means is accommodated by one private branch exchange in which the incoming call is detected, and when the one of said extension telephones selected by said second means is accommodated by another private branch exchange, for transferring said incoming call to the other private branch exchange through said communication line.