1. 8x8 Inc.
2. Alvaria Inc.
3. Aria Telecom solutions Pvt Ltd.
4. AT&T Inc.
5. Atos SE
6. Avaya LLC
7. Cisco Systems Inc.
8. Concentrix Corporation
9. Dialogic Corporation by Enghouse Systems Limited
10. Five9 Inc.
11. Genesys Cloud Services Inc.
12. IVR Lab by A Stormfire Group Company
13. Mitel Networks Corporation
14. NEC Corporation
15. NICE Ltd.
16. Nuance Communications Inc. by Microsoft Corporation
17. Oracle Corporation
18. RingCentral Inc.
19. True Image Interactive Inc.
20. Verizon Communications Inc.
21. Voicent Communications Inc.
22. Vonage Holdings Corp. by Telefonaktiebolaget LM Ericsson
23. West Technology Group
LLC