ITU-T E.138

This Recommendation contains guidelines for the design of public telephone terminals for voice communication to make them more usable for older people, whose sensory, cognitive and motor functions may have deteriorated. Public telephones include all telephones that are not in private offices or households, but that are generally accessible to many people. These guidelines are derived from the requirements of older people that can be identified for each of the steps connected to using a public telecommunication terminal: locating it; initiating a call; providing payment; identifying oneself and the communication counterpart; actually communicating; possibly setting up a further call; terminating the communication.