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A&K Telecoms Consulting Services (UK) Limited
AAPT Limited
ABHIDEEP LTD
Abiba Systems Private Limited
ABIS & Associates
ABITEL Consulting GmbH
ACBIS
Accanto Systems Oy
Accenture
ACG Research
Active Broadband Networks
ADVANCED INFO SERVICE PLC. (AIS)
Advanced Roaming & Clearing House (ARCH)
Advanced Technology Group
AdvOSS
Aerospace Corporation
AetherPal
Affinegy, Inc.
Agama Technologies
AGGAROS
Agiled
AIRCOM International Ltd.
AIST Limited
Aktavara AB
Albanian Mobile Communications Sh. A.
Alcatel-Lucent
Alclarus Limited
Allscripts Healthcare Solutions Inc
Almadar Aljadid
Al-Quds College
Altech ISIS, , a Division of Altech Information Technologies (Pty) Limited
Altibox AS
Alvenie Systems Ltd.
Amartus
Amdocs Management Limited
American University of Ras Al Khaimah -- Electronics and Communication Engineering & Computer Engineering
AMKB Cloud
AMT Group
Andorra Telecom
Anritsu A/S
Antel-Uruguay
Apigee Corporation
Applied Communication Sciences
Applied Network Solutions, Inc.
ArchiTelco
Aria Systems, Inc.
Ariston Global
ARRIS Group Inc.
ARSAT
ARTIN Solutions
Ascom Deutschland GmbH, Systems & Solutions
AsiaInfo-Linkage, Inc.
ASPIDER Solutions US Inc
Aspivia Ltd
AssuringBusiness Pte Ltd
Asteros Labs
AT&T Inc.
ATANOO Europe GmbH
Atheeb intergraph Saudi Co.
Athena- Research and Innovation Center in Information, Communtication and Knowledge Technologies
Athlone Institute of Technology
Atoll Solution Ltd.
Atos
Austen Consultancy Services Ltd
Avea
Avigato Consulting GmbH
Axia NetMedia Corporation
Axiata Group Berhad
Axiata Management Services Sdn Bhd
Axiros GmbH
Azerfon
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