1 EXHIBIT 1.1 12,850,000 SHARES ALLEGIANCE TELECOM, INC. COMMON STOCK, PAR VALUE $.01 PER SHARE UNDERWRITING AGREEMENT April [ ], 1999 April [ ], 1999 Salomon Smith Barney Goldman, Sachs & Co. Donaldson, Lufkin & Jenrette Securities Corporation Morgan...Underwriting Agreement • April 14th, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • New York
