ALEXANDRIA, Va., June 10 -- United States Patent no. 12,295,054, issued on May 6, was assigned to Huawei Technologies'Co.'Ltd.' (Shenzhen, China).

"Communication method, apparatus, and system for voice service" was invented by Zaifeng Zong (Nanjing, China), Shufeng Shi (Xi'an, China) and Zhenyu Tao (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "This application provides a communication method, apparatus, and system for a voice service. The method includes: A session management network element determines that a terminal device is to be handed over from a first network to a second network. The session management network element waits until a first moment to send a request message to a mobility manage...