It was developed by The Parlay Group, which worked closely with ETSI and 3GPP, which all co-publish it.
Universal Music Group | Warner Music Group | Coxeter group | Volkswagen Group | Group of 77 | RTL Group | girl group | BT Group | ABB Group | Group One | Virgin Group | Thales Group | ING Group | group | Rio Tinto Group | Bloomsbury Group | Penguin Group | Carlsberg Group | Borders Group | Arup Group Limited | Benetton Group | Stagecoach Group | LMFAO (group) | Anschutz Entertainment Group | Tata Group | Rootes Group | Westfield Group | Group races | Group C | MTN Group |
The API for OSA is called Parlay, (or Parlay/OSA or OSA/Parlay) as the APIs are developed jointly in collaboration by 3GPP, ETSI, and the Parlay Group.