Telesphere and Marmon sold each other units.

The dual transactions were aimed at strengthening the long-distance telephone services that both Telesphere International Inc. and Marmon Telephone Network supply mostly to the lodging industry. Telesphere, based in Oak Brook, Ill., will pay Chicago-based Marmon Telephone Network, a unit of Marmon Group, $5.2 million for its long-distance network business and telephone switching facilities in Carson, Chicago, Atlanta and Stamford, Conn. Marmon will pay Telesphere $3.7 million for its hotel call-accounting installation, maintenance and repair operations serving 800 hotels nationwide.