CIRCUIT-SWITCHED CALL DELIVERY

摘要

Example embodiments disclosed herein relate to implementing a circuit-switched (CS) call delivery to a mobile device. An unstructured supplementary service data (USSD) message is sent to the mobile device to return to a CS domain. If the mobile device has returned to a first mobile switching center (MSC) of the CS domain, the call is delivered. If the mobile device has not returned to the first MSC, a duration of time set for the mobile device to register with a second MSC of the CS domain and the call is delivered if registration is complete within the duration of time.