1 EXHIBIT 10 NOTE: CERTAIN MATERIAL HAS BEEN OMITTED FROM THIS DOCUMENT PURSU- ANT TO A REQUEST FOR CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SEC. CREDIT AND GUARANTY AGREEMENT DATED AS OF APRIL 1, 1999Credit and Guaranty Agreement • July 20th, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • New York
