Patent ID: 8825774

Claim:
A method comprising: sending, in a telecommunications network, to a mobile terminal, a text-form message, wherein the text-form message relates to a current session and a current stage of the current session within a predefined dialog including a plurality of stages in which the current stage of the predefined dialog determines a sender address of the text-form message, wherein the sending comprises altering the sender address of the text-form message, and wherein the altered sender address is determined based on a combination of a session number of the current session and the current stage of the current session; and receiving, at the altered sender address or at an address contained in the sent text-form message, a reply message from the mobile terminal, wherein the predefined dialog proceeds based on contents of the reply message, wherein the reply message is a service order message, which is associated with at least one order for a supplementary service, and which is subject to payment, and wherein the method further comprises initiating delivery of the supplementary service over a communications channel that is not used to send or receive the text-form messages.