Method and system for transmitting messages to subscribers during the set-up stage of incoming telephone calls

A method for transmitting messages to subscribers to a telephone network during a set-up stage of incoming calls prior to the off-hook from a local exchange (9) to at least one telephone terminal (10) through an access system (4), wherein said access system (4) simulates, on one side, the operation of a telephone terminal towards the local switching exchange (9) such that it receives and stores at least a first message sent from said local switching exchange (9);

• and, on the other side, it simulates the operation of a local switching exchange towards the telephone terminal (10) such that it generates and sends to said telephone terminal (10) a second message which is a replication of said first message, wherein the access system (4) communicates with the local switching exchange (9) and with one or more associated telephone terminals (10) over respective two-wire telephone lines (8), and
• the first message sent from the local switching exchange (9) is modulated, being demodulated in order to be stored in the access system (4) for later replication, the simulation on the part of the access system (4) of the operation of a telephone terminal towards the local switching exchange (9) comprising the steps of:
• sending an alert signal from the local switching exchange (9) to a central access node (5) located in the access system (4);
• activating in the central access node (5) message detection means for receiving at least one message intended for the associated telephone terminal (10);
• allocating resources by the central access node (5) towards a network termination means (6) located in the access system (4) and to which is connected the telephone terminal (10) for which the message is intended;
• receiving in the central access node (5) a first modulated message coming from the local switching exchange (9);
• and
• demodulating in the central access node (5) each first modulated message so received, and storing it in a memory (54) for its later forwarding to the telephone terminal (10).