Accenture

    Alcatel

    Analysys

    A.T. Kearney

    AT&T

    Atos Origin

    BT

    Batelco

    BCG

    Belgacom

    Bezeq

    Booz Allen Hamilton

    C&W

    Cap Gemini

Detecon

Deutsche Telekom

DiamondCluster 

Equant

Ericsson

Ernst & Young

HSBC

Huawei Technologies

IBM

Intelsat

KPN

Lucent

Marconi

McKinsey

MCI

Mercer

Merill Lynch

Morgan Stanley

Motorola

Nokia

Nortel

Optus

Ovum

PwC

Parsons

Siemens

Singapore Telecom

SITA

Sofrecom

Sony

Sprint

Swedtel

Swisscom

T-Systems

Telecom Italia

Telekom Malaysia

Telkom Indonesia

Telefonica

Teleglobe

Telia Sonera

Telus

ZTE