A method for processing an incoming call to a called terminal in a telecommunications network, implemented by a TAS server in an IMS network. The method includes: interrogating an SDM entity to determine whether the service profile of the user associated with the called terminal contains IN terminating service information; interrogating an SDM entity to determine whether the routing domain to be used to route the call to the called terminal is a circuit or packet type; if the routing domain is a packet type, determining whether the called terminal is effectively reachable in packet mode, and if applicable, via which type of access network; if the service profile contains IN terminating information, allowing the IN terminating service provided for the user of the called terminal to be distinguished according to the type of access network of the called terminal; and routing the call to the called terminal.