Exhibit 10.57 Loan and Security Agreement dated March 4, 1997 between Bank One, Arizona, N.A. and Registrant and Modification Agreement dated July 25, 1997. MODIFICATION AGREEMENT ---------------------- DATE: July 25, 1997 ----- PARTIES: Borrower:...Loan and Security Agreement • March 30th, 1998 • Inter Tel Inc • Telephone & telegraph apparatus • Arizona
