SynonymDefinitionAntonym.com - English Synonym Dictionary

Electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

Electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language

Get or try to get into communication (with someone) by telephone