| | | | | |
| Name | Jurisdiction of Incorporation |
| Network Equipment Technologies, Inc. | Delaware |
| Ribbon Communications Operating Company, Inc. | Delaware |
| Ribbon Communications Federal Inc. | Delaware |
| Sonus Networks, Inc. | Delaware |
| GENBAND Inc. | Massachusetts |
| ECI de Argentina S.A. | Argentina |
| Ribbon Communications Australia Pty Ltd | Australia |
| Ribbon Communications do Brasil Ltda. | Brazil |
| Ribbon Communications Canada ULC | Canada |
| Ribbon Networks Communications Chile Limitada | Chile |
| Ribbon Communications Shanghai Co., Ltd. | China |
| Ribbon Communications Shanghai Co., LTD Hangzhou Branch | China |
| Ribbon Communications Sur America Ltda. | Colombia |
| Ribbon Communications Costa Rica S.A. f/k/a ECI Telecom Costa Rica S.A. | Costa Rica |
| Ribbon Communications Czech Republic s.r.o. | Czech Republic |
| Ribbon Communications France EURL | France |
| Ribbon Communications Germany GmbH | Germany |
| Ribbon Communications Hong Kong Limited | Hong Kong |
| GENBAND Telecommunications Private Limited | India |
| Ribbon Communication Pvt. Ltd. | India |
| ECI Telecom India Private Limited | India |
| Ribbon Communications International Ltd. | Ireland |
| Ribbon Communications Israel Ltd. | Israel |
| ECI Telecom Group Ltd. | Israel |
| ECI Telecom Ltd. | Israel |
| Negev Telecom Ltd. | Israel |
| Ribbon Communications Italy S.R.L. | Italy |
| Ribbon Communications Kabushiki Kaisha | Japan |
| Ribbon Communications Malaysia Sdn. Bhd. | Malaysia |
| Ribbon Communications Mexico S. de R.L. de C.V. | Mexico |
| GENBAND Canada B.V. | Netherlands |
| Ribbon Networks B.V. | Netherlands |
| GENBAND NS B.V. | Netherlands |
| Ribbon Communications B.V. | Netherlands |
| ECI Telecom (PH), Inc. | Philippines |
| Ribbon Communications Polska sp.z.o.o. | Poland |
| Ribbon Communications Rus Limited Liability Company | Russia |
| ECI Telecom 2005 LLC | Russia |