Telephony

File Format
Name	Telephony
Ontology	Electronic File Formats Telephony
Released	1876
Old-timey telephone

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&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.

• Fax machine
  • T.37 (fax to e-mail)
  • T.38 (fax over IP)
• Media Gateway Control Protocol (MGCP)
• Modem
  • Hayes command set
• Session Initiation Protocol (SIP)
• Telephone numbering

See also Address books and contacts for formats used to store contact lists on mobile phones, and Audio and Music and Video for formats used to store sounds and moving images.

External links

• Bell System Technical Journal archives
• Classic 1960 article on signaling systems
• Fences as primitive phone networks
• Dial-up handshaking illustrated
• DIY cell phone
• Why your cell phone doesn't have a dial tone
• Interview about phone phreaking
• Cell phone data mining
• Exploding the Phone
• 1990s telecommunications as predicted in 1969
• Video: Making phone call through 1950s electromechanical exchanges
• Bell System Coin Service Manual (1972) - Everything you wanted to know about old-fashioned pay phones
• 1200-year-old telephone
• Meet the Robot Telemarketer Who Denies She’s A Robot
• HOWTO make an intercom out of obsolete corded phones
• Adorably Perplexed Kids React to Rotary Phones