US Patent Issued to T-Mobile USA on April 22 for "Inaudibly notifying a caller of a status of an open-line call" (Washington Inventors)

ALEXANDRIA, Va., June 6 -- United States Patent no. 12,284,582, issued on April 22, was assigned to T-Mobile USA Inc. (Bellevue, Wash.).

"Inaudibly notifying a caller of a status of an open-line call" was invented by Hsin-Fu Henry Chiang (Bellevue, Wash.) and William Michael Hooker (Bellevue, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The system receives a SIP call from a UE associated with a user, where the SIP call includes multiple fields, and where a field among the multiple fields indicates that the SIP call is the open-line call. The system receives a first indication that the UE associated with a callee has generated a notification to the callee of the SIP call. Upon identifying the SIP call...