Links related to ABR Telecom's sector of action: 
Associations
Abrafix (Brazilian Association of Commuted Fixed Telephone Service Concessionaires)
Acel (National Association of Mobile providers)
Telcomp (Brazilian Association of Competitive Telecommunication Service Providers)
Telebrasil (Brazilian Association of Telecommunications)

Government
Ministry of Communications
Ministry of Science and Technology

Regulatory Body
Anatel