1. AT&T Inc.
2. Bell Canada Enterprises Inc.
3. Bharti Airtel Limited
4. China Telecom Corp. Ltd.
5. China United Network Communications Group Co. Ltd.
6. Cox Communications Inc.
7. DASAN Networks
8. Deutsche Telekom AG
9. Enablence Technologies Inc.
10. Fujikura Ltd.
11. Huawei Technologies Co. Ltd.
12. KT Corporation
13. Lumen Technologies
14. NTT Group
15. Open Fiber S.p.A.
16. Orange S.A.
17. PLDT Inc.
18. Reliance Communications Limited
19. Singapore Telecommunications Limited
20. SK Telecom Co. Ltd.
21. Swisscom AG
22. TalkTalk Telecom Group Limited
23. Tata Sons Private Limited
24. Telefonica S.A.
25. Telenor ASA
26. Telia Company AB
27. Telkom Indonesia
28. TELUS Communications Inc.
29. TIM S.p.A.
30. Ubiqcom India Pvt. Ltd.
31. Verizon Communications Inc.
32. Vodafone Group PLC
33. Windstream Holdings Inc.
34. ZTE Corporation