TOPP TELECOM. The Parties bind themselves to make their best effort so that the support letter given by Telmex in favor of Xxxxxxxx, N.A., on the Topp Telecom investment credit, be substituted by a support letter issued by Radiomovil Dipsa, S.A. de C.V. or any of its subsidiaries and Telmex be relieved from any and all obligations or liabilities resulting from that letter.
