A telecommunications system comprises a server (20) arranged to issue information to a customer (10) and to receive data from the customer over a data network (15) and a processing means, coupled to the server (20), which is arranged to extract, from the received data, a telephone number of the customer. For improved security and efficiency, the system further comprises initiation means to initiate a telephone call to that customer via a telephone network (25) independently of the data network and an automated response system which is arranged to communicate with the customer by means of the telephone call (11).