1 EXHIBIT 23.8 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS Herrn Dr. Henning F. Klose Vorsitzender des Vorstands TelDaFax AG Postfach 22 06 35010 Marburg We hereby consent to the use in the Prospectus constituting a part of this Registration Statement on Form S-3 of our report dated August 2, 2000, relating to the consolidated financial statements of TelDaFax AG, which is contained in that Prospectus. We also consent to the reference to us under the caption "Experts" in the Prospectus. Wiesbaden, December 14, 2000 BDO Deutsche Warentreuhand Aktiengesellschaft Wirtschaftsprufungsgesellschaft /s/ H. G. Bungers /s/ M. Karlik - ------------------------- ------------------------- H. G. Bungers M. Karlik