Embodiments of this application relate to the communications field and disclose a network handover method and a session management network element. The method includes: receiving, by a session management network element, first indication information and second indication information from an access management network element, wherein the first indication information is used to indicate that a terminal device is handed over from a first network to a second network to set up a voice service, and the second indication information is used to indicate that the terminal device needs to return to the first network after the voice service ends; and sending, by the session management network element, the first indication information and the second indication information to an access network device of the second network.