Patent 7221743 was granted and assigned to Deutsche Telekom on May, 2007 by the United States Patent and Trademark Office.
A method for operating a message memory connected to a telecommunications network includes assigning a message memory to a subscriber line of an addressee, the subscriber line being selectable using an individual network indicator. Using the message memory, a message left by a sender for the addressee is stored so that the message is retrievable by the addressee. After an authenticating by the sender; the content of the stored message is changed by the sender.