Telephony

Since Alexander Graham Bell invented the telephone in 1876, it has been a major feature in our lives, evolving from wired "Plain Old Telephone Service" (POTS) to now support a whole range of mobile phone protocols and Internet-based Voice Over IP (VOIP). AT&amp;T introduced picturephones in 1964, but they didn't catch on then; however, various forms of video chatting are now commonplace to accompany traditional voice-only telephony.


 * Session Initiation Protocol (SIP)

See also Address books and contacts for formats used to store contact lists on mobile phones.