Circuit switching SITA ARINC AT&T mailbox Peripheral device U.S. Defense Switched Network U.S. federal telecommunications system World Wide Web International calling country code Alternate telephone Videotex number Cellular phone International telephone direct line O.F.T.P. (ODETTE File Transfer Protocol) Uniform Resource Location (URL) Very High Frequency (VHF) radio telephone Cable address EDI transmission Electronic mail Extension File transfer access method Telefax GEIS (General Electric Information Service) mailbox IBM information exchange Internal mail Mail Postbox number Packet switching S.W.I.F.T. Telephone Telegraph Telex Telemail Teletext TWX X.400 address Pager International telephone switchboard National telephone direct line National telephone switchboard DT Channel_ Code. Type Code Channel Code. Type UN/ECE 3155 6 United Nations Economic Commission for Europe Communication Address Code Qualifier D03A http://www.unece.org/trade/untdid/d03a/tred/tred3155.htm urn:oasis:names:tc:ubl:codelist:ChannelCode:1:0