1. 3clogic
2. Alcatel-Lucent Enterprise
3. Ameyo
4. Aspect Software
5. Avaya Inc.
6. Cisco Inc.
7. CloudTalk
s.r.o.
8. Enghouse Group
9. Huawei Technologies Co. Ltd.
10. International Business Machines Corporation
11. Mitel Networks Corporation
12. NEC Corporation
13. NICE Ltd.
14. Oracle Corporation
15. Ring Central