Exclusive Agreement Provides Swiftly Expanding Carrier with Competitive Advantages: Rapid Time-to-Market and the Ability to Provide Superior Billing.

St. Louis, MO, September 22, 1998 - Intertech Management Group announced today that Allegiance Telecom, Inc. (NASDAQ: ALGX) has successfully implemented Intertech's innovative Windows NT-based Network Strategies billing solution in four major tier one markets - Dallas, Chicago, Atlanta and New York. In addition to providing Allegiance with data collection, billing and rating functions, this exclusive service bureau agreement is providing the carrier with competitive advantages that include a rapid time-to-market and the ability to provide superior billing and customer care. These advantages will be essential as Allegiance proceeds with its plans to offer a complete package of services - including local, long distance, international calling, high-speed data transmission and Internet services - in 24 major metropolitan areas in the U.S.

Going forward, the flexibility and robust functionality inherent to Network Strategies will allow Allegiance to quickly add new services to its offerings and new customers to its roster.

With a stated commitment to providing superior care to its customers, Allegiance also sought a solution that would enable such capabilities as custom billing. With Network Strategies, Allegiance customers enjoy the benefits of receiving a single, easy-to-understand monthly invoice for local, long distance, Internet and data services and can choose from a variety of reports that enable them to more easily manage their telecommunications services.

"Allegiance is clearly focused on providing its customers with leading edge telecommunications services and exceptional customer care," said David Wilson, president of Intertech. "They recognize the intrinsic role that state-of-the-art operational support systems play in that endeavor and we are pleased to be supporting their billing needs."

Network Strategies Billing Software Intertech's Network Strategies software is designed specifically for the competitive communications market. Based on leading-edge Windows NT technology, Network Strategies enables service providers to offer convergent, multiple services including local, long distance, private line, ISP, data and enhanced services, with a reduced time to market and a significantly lower total cost of ownership than mainframe, AS/400 and UNIX vendors.

Network Strategies' robust, highly scalable architecture provides all the functionality needed for providing superior support to rapidly growing customer bases, including the establishment of new accounts, complex order management, customer inquiry, invoice adjustments and customer-specific pricing. Written in Visual C++ for Windows NT, Network Strategies' software utilizes a relational database, supports multiple hardware platforms and offers all the benefits of true client / server computing.

About Intertech
Intertech is the leading provider of Windows NT-based billing, customer care and order management solutions to the competitive communications industry. Intertech's products and services support convergent, multiple services including local, long distance, private line, ISP, data and enhanced services and promote superior customer care, reduced time to market and a lower total cost of ownership - all critical factors in the increasingly competitive communications marketplace. Intertech's flexible delivery options, high functionality and proven scalability make it ideal for emerging carriers and high growth companies. Intertech's customers include Williams Co., Frontier Corporation, Allegiance Telecom, GTE, IXC Communications, US West and Swisscom-NA. For more information on Intertech, visit the company's web site at www.billingsoftware.com.

About Allegiance Telecom
Allegiance Telecom is a competitive local exchange carrier headquartered in Dallas, Texas. The Company offers businesses a complete package of telecommunications services, including local, long distance, international calling, high-speed data transmission and Internet services. Allegiance is targeting 24 major metropolitan areas in the U.S. with its "one-stop shopping" approach. The Company's web address is www.allegiancetele.com.

Network Strategies is a Registered Trademark of Intertech Management Group, Inc. Windows is either a registered trademark or trademark of Microsoft Corp. in the United States and/or other countries. All other brand or product names are the trademark or registered trademark of their respective holders.