ALEXANDRIA, Va., March 26 -- United States Patent no. 12,261,981, issued on March 25, was assigned to Twilio Inc. (San Francisco).

"Telephony web event system and method" was invented by Jeffrey Lawson (San Francisco), John Wolthuis (San Francisco) and Evan Cooke (San Francisco).

According to the abstract* released by the U.S. Patent & Trademark Office: "An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telepho...