Method and device for assisting in providing real-time call capability

The invention provides a method and a device for assisting in providing real-time call capability. The method comprises the following steps: a terminal sends a call invitation message to a 5G message platform through WIFI equipment, and an SBC network element of the 5G message platform sends the call invitation message to a CALLAS network element through a CSCF network element; and the CALLAS network element completes calling logic processing based on the telephone number of the calling terminal, and sends a call invitation message to the IMS core network through the CSCF network element and the SBC network element based on the telephone number of the called terminal so as to request the IMS core network to send the call invitation message to the called terminal to establish a 5G message call channel. The call fallback mechanism of the WIFI access capability through the 5G message is added, the call reachability of the calling terminal side and the called terminal side under the extreme conditions that the co