ALEXANDRIA, Va., April 21 -- United States Patent no. 12,609,973, issued on April 21, was assigned to MediaTek Inc. (Hsinchu City, Taiwan).
"Method for handling calls with sessions initiation protocol" was invented by Ying-Cen Lai (Hsinchu City, Taiwan), Chien-Yi Wang (Hsinchu City, Taiwan) and Nuan-Yu Yang (Hsinchu City, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for handling a call using Sessions Initiation Protocol (SIP) includes sending an INVITE or a first media type by a network side to user equipment, sending an UPDATE of a second media type by the user equipment to the network side, receiving an SIP global failure response for the UPDATE by the user equipment from the network side...