A method performed by a User Equipment, UE, for facilitating voice call handover, the method comprising: making (S2120) a voice call through a Wireless Local Area Network, WLAN, under whose coverage the UE is located, using a Packet Data Network, PDN, address assigned to the UE by a PDN to which the WLAN is connected; determining (S2130) that a signal quality of the WLAN is not suitable for the voice call any more; in response to the determination that the signal quality of the WLAN is not suitable for the voice call any more, starting (S2135) a PDN address sending timer; initiating (S2150) a Radio Resource Control, RRC, connection procedure with the base station in response to determining (S2140) that the UE has no RRC connection with the base station; sending (S2160) the PDN address to a base station of a mobile communication network covering the UE and with which the UE has established a Radio Resource Control, RRC, connection, for facilitating a core network node of the mobile communication network to perform voice call handover from said WLAN to the mobile communication network; receiving, from the base station, a response message indicating the UE is successfully attached to the mobile communication network, said response message including a new PDN address assigned to the UE; and continuing (S2170) the voice call through the mobile communication network using the new PDN address, wherein before the PDN address sending timer expires (S2185), sending the PDN address to the base station one or more times, and after the PDN address sending timer expires (S2185), sending (S2190) a message not containing the PDN address to the base station. making (S2120) a voice call through a Wireless Local Area Network, WLAN, under whose coverage the UE is located, using a Packet Data Network, PDN, address assigned to the UE by a PDN to which the WLAN is connected; determining (S2130) that a signal quality of the WLAN is not suitable for the voice call any more; in response to the determination that the signal quality of the WLAN is not suitable for the voice call any more, starting (S2135) a PDN address sending timer; initiating (S2150) a Radio Resource Control, RRC, connection procedure with the base station in response to determining (S2140) that the UE has no RRC connection with the base station; sending (S2160) the PDN address to a base station of a mobile communication network covering the UE and with which the UE has established a Radio Resource Control, RRC, connection, for facilitating a core network node of the mobile communication network to perform voice call handover from said WLAN to the mobile communication network; receiving, from the base station, a response message indicating the UE is successfully attached to the mobile communication network, said response message including a new PDN address assigned to the UE; and continuing (S2170) the voice call through the mobile communication network using the new PDN address, wherein before the PDN address sending timer expires (S2185), sending the PDN address to the base station one or more times, and after the PDN address sending timer expires (S2185), sending (S2190) a message not containing the PDN address to the base station. <EOS>