EXHIBIT 21.1 SUBSIDIARIES OF PREMIERE GLOBAL SERVICES, INC. JURISDICTION OF SUBSIDIARY ORGANIZATION --------------------------------------------------------------------------- American Teleconferencing Services, Ltd. Missouri Accucast, Inc. Georgia CCS ConferenceCallService GmbH Germany Clarinet, Inc. Georgia Communications Network Enhancement Inc. Delaware Comwave UK, Ltd. United Kingdom Fastwell Technology Limited Hong Kong iMeet, Inc. Delaware Intellivoice Communications, LLC Delaware Netspoke, Inc. Delaware Premiere Communications, Inc. Florida PCI Network Services, Inc. Georgia Premiere Conferencing E.U.R.L. France Premiere Conferencing GmbH Germany Premiere Conferencing Limited New Zealand Premiere Conferencing Pte. Ltd. Singapore Premiere Conferencing Pty Limited Australia Premiere Conferencing (Canada) Limited Canada Premiere Conferencing (Hong Kong) Limited Hong Kong Premiere Conferencing (Ireland) Limited Ireland Premiere Conferencing (Japan), Inc. Japan Premiere Conferencing (UK) Limited United Kingdom Premiere Conferencing Networks, Inc. Georgia Ptek, Inc. Georgia Ptek Investors I LLC Delaware PTEK Services, Inc. Delaware Ptek Ventures I LLC Delaware RCI Acquisition Corp. Georgia SaveOnConferences.Co.Uk Limited United Kingdom SaveOnConferences.De GmbH Germany Unimontis AG Switzerland Unimontis M&C AG Switzerland Unimontis GmbH Germany Vitel Limited United Kingdom Voice-Tel Enterprises, LLC Delaware Voice-Tel of New Zealand Limited New Zealand Voice-Tel Pty Ltd. Australia Xpedite, Inc. Japan Xpedite I.N. Services GmbH Germany Xpedite, Ltd. Korea Xpedite Systems Limited Hong Kong Xpedite Network Services, Inc. Georgia Xpedite Systems Inc. (Malaysia) Sdn. Bhd. Malaysia Xpedite Systems AG Switzerland Xpedite Systems Canada, Inc. Canada Xpedite Systems GmbH Germany Xpedite Systems Holdings (UK) Limited United Kingdom Xpedite Systems, LLC Delaware Xpedite Systems Limited New Zealand Xpedite Systems Limited United Kingdom Xpedite Systems NV/SA Belgium JURISDICTION OF SUBSIDIARY ORGANIZATION --------------------------------------------------------------------------- Xpedite Systems Participation E.U.R.L. France Xpedite Systems Pte. Ltd. Singapore Xpedite Systems Pty Limited Australia Xpedite Systems S.r.l. Italy Xpedite Systems Spain, S.A. Spain Xpedite Systems, S.A. France Xpedite Systems Worldwide, Inc. Delaware