Techniques are disclosed that allow a user or upper-layer application running on a user equipment operating on a 5G network to ignore or reject an incoming call. This allows a user to avoid the degraded performance resulting from the fallback procedure that would otherwise terminate the 5G data connection in favor of a lower-capability network to complete the incoming call. Based on a command transmitted with the incoming call, the technique allows a user equipment to initiate a radio resource control (RRC) re-establishment procedure to recover 5G service. Alternatively, in the event the user equipment is connected to a network that only supports fallback call procedures, the technique allows a user or upper-layer application to reject the call by issuing a session initiation protocol (SIP) BYE message.
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Chen, Kuan-wei and Lin, Roy, "Reject EPS-FB and RAT-FB Call at Mobile Terminal", Technical Disclosure Commons, (May 03, 2021)