To access to a multimedia service designated by a call number in a mobile terminal connected to a radio communication network, a server predefines a correspondence table comprising call numbers associated with respective service identifiers and transmit it to the mobile terminal which stores it. When a call number is entered and confirmed by a channel seizing key in the terminal, an application determines the service identifier associated with the call number in the table and requests the setting up of a call with a server providing a multimedia service as a function of the determined service identifier. The call number can be transmitted to the server in order for the server to transmit a confirmation message comprising the call number or an address associated with the call number in order for the application to request the setting up of a call.