EXHIBIT 23.6 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the use in this Registration Statement on Form S-1 of our report dated November 19, 1999 relating to the financial statements of GTN Gesellschaft fur Telekommunikations-und Netzwerkdienste mbH, which appears in such Registration Statement. We also consent to the reference to us under the heading "Experts" in such Registration Statement. PricewaterhouseCoopers GmbH Wirtschaftsprufungsgesellschaft /s/ I. Trauer /s/ A. Jacobs Dusseldorf, Germany November 19, 1999