| Advanced Television Systems Committee (ATSC) |
| African Telecommunications Union (ATU) |
| African Telecommunication Regulators Network (ATRN) |
| Alliance for Telecommunications
Industry Solutions (ATIS) |
| Americas
Carriers Telecommunications Association (ACTA) |
| American Mobile Telecommunications
Association (AMTA) |
| American National Standards
Institute (ANSI) |
| American Registry for Internet
Numbers (ARIN) |
| PACE (Professional Association for customer engagement |
| Arab Bank for Economic Development
in Africa (ABEDA) |
| Arab Fund for Economic and Social
Development (AFESD) |
| UMA |
| Arab Monetary Fund (AMF) |
| Arab Regional Office (ITU) |
| AREG Home Network |
| Avaya |
| Asia Pacific Telecommunity (APT) |
| Asia-Pacific Broadcasting Union (ABU) |
| Asia-Pacific Satellite Communications
Council (APSCC) |
| Asian Info-Communication Council (AIC) |
| Asian Development Bank (ADB) |
| Asian Institute of Technology (AIT) |
| Asian and Pacific Centre for
the Transfer of Technology (APCTT) |
| Association for Local Telecommunications
Services (ALTS) |
| Association of Long Distance Telephone Companies (ALTEL) |
| Association of Communications
Enterprises (ASCENT) |
| Association of TeleServices
International (ATSI) |