1. A method for delivering information to a subscriber involved in a certain active telephony session, said method comprising: a) receiving a message originating from a sender and directed to the subscriber, wherein the message is associated to sender identification data; b) causing information related to the message to be delivered to the subscriber by interrupting the certain active telephony session; c) determining whether the sender is permitted to interrupt the subscriber during an active telephony session by processing the sender identification data; d) causing information related to the message to be delivered to the subscriber during the certain active telephony session when it is determined that the sender is permitted to interrupt the subscriber during an active telephony session.