EXHIBIT 21.1

Subsidiaries

Domestic Subsidiaries


		Jurisdiction of
Entity Name		Organization
IPC Information Systems Services, Inc.		Delaware
IPC Information System Holdings USA, Inc.		Delaware
IPC Information System Holdings USA, L.L.C.		Delaware
Gains Acquisition Corp.		Delaware
Gains Asia Acquisition LLC		Delaware
IPC Funding Corp.		Delaware
IPC Information Systems Holdings, Inc.		Delaware
IPC Information Systems Holdings, L.L.C.		Delaware
IPC Information Systems Services, L.L.C.		Delaware
IPC Command Systems, Inc.		New Jersey
Geo911, Inc.		Arizona
V Band Corporation		Delaware
IPC Network Services, Inc		New York
Purple Voice, Inc.		Delaware
HNG Corp.		Delaware
IPC Systems, Inc.		Delaware
Positron Public Safety Systems Corp.		Georgia
Masys Corporation		Minnesota
Westcom Holding Corp.		Delaware
KGM Circuit Solutions, LLC		New York
IPC Information Systems Far East, Inc.		Delaware
IPC Westcom, LLC		New York
IPC Tradelines, LLC		New York

Foreign Subsidiaries


Entity Name		Jurisdiction of Organization
TSW Netherlands Holdings C.V.		Netherlands
TSW Netherlands BV		Netherlands
IPC Information Systems (Hong Kong) Limited		Hong Kong
IPC Network Services Asia Ltd.		Hong Kong
IPC Network Services (Hong Kong) Ltd.		Hong Kong
IPC Information Systems Hong Kong Holdings Ltd.		Hong Kong
IPC NS UK SPC Limited		England and Wales
IPC Network Services Limited		England and Wales
IPC Information Systems UK Holdings Limited		England and Wales
IPC Information Systems Canada, Inc.		Canada
IPC UK Holdings Ltd.		England and Wales
IPC Network Services UK Holdings Limited		England and Wales
IPC UK SPC Ltd.		England and Wales
IPC Information Systems		England and Wales
Purple Voice, Ltd.		England and Wales
Purple Voice Holdings, Ltd.		England and Wales
V Band Limited		England and Wales
IPC Information Systems (Singapore) Pte. Ltd.		Singapore
IPC Network Services (Singapore) Ltd.		Singapore
IPC Information Systems (Australia) Pty. Ltd.		Australia
IPC Network Services (Australia) Pty. Ltd.		Australia
IPC Information Systems (Malaysia) Sdn. Bhd.		Malaysia
IPC Information Systems (Japan) K.K.		Japan
PT. IPC Information Systems Indonesia		Indonesia
IPC Information Systems Shanghai Ltd.		China
IPC Information Systems GmbH		Germany
IPC Information Systems France S. A. R. L.		France
IPC Information Systems S.R.L.		Italy

3


Entity Name		Jurisdiction of Organization
TSW Command Systems Inc.		Canada
Positron Public Safety Systems, Inc.		Canada
GeoMobile, Inc.		Canada
IPC Network Services Japan, K.K.		Japan
IPC Network Services EMEA Limited		England and Wales
Westcom Telecom Singapore Pte. Ltd.		Singapore
Westcom Europe Limited		United Kingdom
Westcom Hong Kong Limited		Hong Kong
Lexar UK Limited		United Kingdom
Westcom Dedicated Private Lines Limited		United Kingdom
IPC Network Services Canada ULC		Nova Scotia

IPC Systems Holdings Corp. S-1