Missed information or incomplete information obtained from telephone conversations should alert a person to the need for amplification of the telephone equipment. There are various devices to use for telephone amplification. Many public telephones are equipped with this type of amplifier for sound. Other assistive devices include loud bells or light flashers to alert the person to answer the telephone, text telephones that spell out the conversation on a small screen, and volume controls for telephone handsets. TDDs provide for spoken words to be converted into written words on the device.
People type the messages and responses back and forth to each other.
To communicate effectively, a TDD must be in place on both ends of the communication line. Published by iMcKesson Clinical Reference Products. All rights reserved.