1. Accenture PLC
2. Amdocs Ltd.
3. Aria Systems Inc.
4. Cerillion PLC
5. CHR Solutions
6. Comarch SA
7. Hansen Technologies Ltd.
8. Hewlett Packard Enterprise
9. Hitachi Ltd.
10. Huawei Technologies Co. Ltd.
11. NEC Corp.
12. Nokia Corp.
13. Optiva Inc. by EPAM Systems
14. Oracle Corporation
15. Subex Ltd.