1. Airbus SE
2. AT&T Inc.
3. Bell Canada Inc.
4. GroupTalk Sweden AB
5. Hytera Communications Corporation Limited
6. International Push to Talk Ltd.
7. Iridium Communications Inc.
8. L3Harris Technologies Inc.
9. Motorola Solutions Inc.
10. Orion Labs Inc.
11. Peak PTT
12. Qualcomm Incorporated
13. RugGear
14. Simoco Wireless Solutions
15. T-Mobile by Sprint Corporation
16. Tait Communications
17. TeamConnect
18. Telstra Corporation Limited
19. Verizon Wireless Inc.
20. VoiceLayer by Procore Technologies Inc.
21. Zebra Technologies Corp.
22. Zello Inc.
23. Zinc