Contract analysis

I. IDENTIFICATION OF APPEARING ATTORNEYS The following attorneys of Calderwood & Harkness LLP hereby enter their appearance as counsel on behalf of Defendants Northgate Telecommunications PLC and Northgate Networks America Inc.: A. Elaine Forsythe Role: Responsible Partner, Antitrust & Competition Practice Group Bar Admissions: Member in good standing of the Bar of the United States District Court for the Eastern Dis

II. DESIGNATION OF LEAD COUNSEL AND SERVICE INFORMATION Defendants respectfully request that all pleadings, notices, motions, orders, memoranda, briefs, discovery materials, correspondence, and all other papers in this action be served upon lead counsel at the following address: Elaine Forsythe (Lead Counsel / Attorney of Record for Service) Calderwood & Harkness LLP 1200 K Street NW, Suite 900 Washington, D.C. 20005

III. STATEMENT REGARDING CLIENTS Calderwood & Harkness LLP has been duly retained by, and appears on behalf of, both named Defendants in this action, as follows:

1. Northgate Telecommunications PLC — a public limited company organized and existing under the laws of England and Wales, registered with Companies House under Company No. 07824561, with American Depositary Receipts ("ADRs") listed on the Nasdaq Stock Market under the ticker symbol "NTP," and maintaining its global headquarters at 14 Broadwall Lane, London SE1 9PQ, United Kingdom. Northgate Telecommunications PLC is

2. Northgate Networks America Inc. — a corporation organized and existing under the laws of the State of Delaware, with its principal place of business at 8200 Dulles Corner Boulevard, Suite 1100, Tysons Corner, Virginia 22182. Northgate Networks America Inc. is a wholly owned U.S. operating subsidiary of Northgate Telecommunications PLC and conducts Northgate's business operations within the United States, including

IV. REQUEST FOR SERVICE OF ALL PAPERS Defendants, by and through their undersigned counsel, respectfully request that the Clerk of Court and all parties to this action serve all future papers, pleadings, motions, orders, notices, discovery requests and responses, subpoenas, correspondence, and any other documents filed or issued in connection with this proceeding upon counsel for Defendants at the addresses set forth

V. COMPLIANCE WITH LOCAL RULES This Notice of Appearance is filed in compliance with the Local Civil Rules of the United States District Court for the Eastern District of Virginia. Undersigned counsel Elaine Forsythe, Aaron Liu, and Monica Reyes are each members in good standing of the Bar of this Court and are eligible to practice before this Court without further application. With respect to Howard Bellamy, who is