1. A method for restricting access to a telephone network by a call management system associated with a controlled environment facility, the method comprising: registering a user of the call management system, the registering including: receiving a first image from the user via a camera coupled to a plurality of user telephones; verifying the first image is indicative of a face using image recognition; associating the verified first image with the user; and storing the verified first image in a database; and authenticating a call access attempt by the user, the call access attempt being an attempt by the user to gain access to the telephone network for purposes of making a telephone call, the authenticating including: the call management system: receiving the call access attempt by the user of a telephone, the telephone being one of the plurality of user telephones; prompting the user for a second image; determining whether a visual characteristic of the second image is a statistical match to a visual characteristic of the stored verified first image; and allowing or rejecting the call access attempt based on the determination.