Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9729407 | Distributed media resources in VoIP networks for providing services | Yigang Cai | 2017-08-08 |
| 9712392 | SIP endpoint configuration in VoIP networks | Yigang Cai | 2017-07-18 |
| 8774178 | Call transfer with multiple application servers in session initiation protocol-based network | Isaac Jian Liu, Ivy Qingfang Meng, Chun Yu Yu | 2014-07-08 |
| 8046381 | IMS network access using legacy devices | Yigang Cai, Simon Chen, Ivy Qingfang Meng, Bill Xiang Yu Qian, Elsie Shu Fang Zhang +1 more | 2011-10-25 |