1. Aarna Networks Inc.
2. Affirmed Networks Inc.
3. Amdocs Limited
4. Argela
5. Aria Networks
6. Blue Planet by Ciena Corporation
7. BT Group PLC
8. Cisco Systems Inc.
9. Hewlett-Packard Enterprise Company
10. Huawei Technologies Co. Ltd
11. Infinera Corporation
12. Mavenir Systems Inc.
13. NEC Corporation
14. Nokia Corporation
15. ZTE Corporation