Generalized method for authenticating subscribers of a service via a graphical user interface or telephone using the same user name and password

A method and system for authenticating a subscriber of a user using a graphical user interface or telephone using the same user name and password is provided. As a result, subscribers need to memorize only one user name and/or password, saving precious time and energy to the subscriber because of the low risk of forgetting the user name and/or password. In addition, with the advent of cross-category products such as web phones (Web user interface integrated in a telephone) and soft phone (software on a personal computer reproducing the function of a telephone), it can become confusing for subscribers to remember which passwords and user name to use for which device. Having one password and one user name to remember makes the situation simpler.