| AA | International Telephone Access Code Dialing Code required to call another country in addition to the number |
| AB | Joint Facsimile and Phone Number |
| AC | Message Only Voice Number Telephone number which provides automated messages only |
| AD | Delivery Location Phone |
| AE | Area Code |
| AP | Alternate Telephone |
| AS | Answering Service |
| AU | Defense Switched Network Department of Defense telecommunications system and successor of the Automatic Voice Network (AUTOVON) |
| BN | Beeper Number |
| BT | BTX Number German communications number for on-line service provided through the Deutsche Bundespost |
| CA | Cable |
| CP | Cellular Phone |
| DN | Defense Data Network (DDN) Department of Defense (DoD) data communications system |
| EA | Internet Email Address Internet based electronic mail address with a structure of "ADDRESSEE @ DOMAIN NAME . DOMAIN NAME EXTENSION" |
| ED | Electronic Data Interchange Access Number |
| EM | Electronic Mail |
| EX | Telephone Extension |
| FT | Federal Telecommunications System (FTS) |
| FU | Facsimile User Identifier |
| FX | Facsimile |
| HF | Home Facsimile Number |
| HP | Home Phone Number |
| IT | International Telephone |
| MN | Modem Number |
| NP | Night Telephone |
| OF | Other Residential Facsimile Number |
| OT | Other Residential Telephone Number |
| PA | Appointment Phone |
| PC | Personal Cellular |
| PP | Personal Phone |
| PS | Packet Switching |
| SP | Showing Phone Phone number to call for information about a property showing |
| TE | Telephone |
| TL | Telex |
| TM | Telemail |
| TN | Teletex Number Teletex is specific type of Telex service provided by Deutsche Bundespost |
| TX | TWX |
| UR | Uniform Resource Locator (URL) |
| VM | Voice Mail |
| WC | Work Cellular |
| WF | Work Facsimile Number |
| WP | Work Phone Number |