Telephone Services Business Contracts

Alamosa Holdings Inc.

AT&T Corp.

BellSouth Corp.

China Mobile (Hong Kong) Ltd.

Concentric Network Corp.

FlashNet Communications Inc.

General Communication Inc.

Global Crossing Ltd.

IXnet Inc.

Jato Communications Corp.

Level 3 Communications Inc.

Net2Phone Inc.

NEXTLINK Communications Inc.

Pacific Century Cyberworks Ltd.

Qwest Communications International Inc.

RCN Corp.

SBC Communications Inc.

Sprint Corp. - FON

Verizon Communications Inc.

Vodafone Group PLC

WorldCom Inc.

XO Communications Inc.