BISK EDUCATION OVERVIEW Upgraded several times throughout the 1990s to convert a digital Nortel PBX TS-1000 into a hybrid telecom system with limited VoIP capabilities, Bisk Education cites three primary factors for abandoning further investment in the Nortel system, and adopting Asterisk as their alternative telecommunications solution. First, since Avaya purchased Nortel in 2009, Calvin Wells, director of Network Operations and Engineering

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