4,485,000 SHARES ILLUMINET HOLDINGS, INC. COMMON STOCK, PAR VALUE $.01 PER SHARE UNDERWRITING AGREEMENT October __, 1999 October __, 1999 Morgan Stanley & Co. Incorporated BancBoston Robertson Stephens Inc. Donaldson, Lufkin & Jenrette Securities...Underwriting Agreement • September 16th, 1999 • Illuminet Holdings Inc • Telephone communications (no radiotelephone) • New York
