Number identifying the service and service user.

Self explanatory.

Postal service document delivery.

The switched telecommunications network of the united states government.

Ccitt message handling system.

Device used for transmitting and reproducing fixed graphic material (as printing) by means of signals over telephone lines or other electronic transmission media.

Text transmission via telegraph.

Transmission of text/data via telex.

According to iso.

Internal mail address/number.

Communication service involving teletypewriter machines connected by wire or electronic transmission media. teletypewriter machines are the devices used to send and receive signals and produce hardcopy from them.

Peripheral device identification.

Voice/data transmission by telephone.

Transmission of text/data via teletext.

Exchange of mail by electronic means.

Communications number assigned by aeronautical radio inc.

The switched telecommunications network of the united states department of defense.

Transmission of text/data via telemail.

The process of routing and transferring data by means of addressed packets so that a channel is occupied only during the transmission; upon completion of the transmission the channel is made available for the transfer of other packets (iso).

A process that, on demand, connects two or more data terminal equipments and permits the exclusive use of a data circuit between them until the connection is released (iso).

At&t mailbox identifier.

Self explanatory.

Self explanatory.

Communications address assigned by society for worldwide interbank financial telecommunications s.c.

Data exchange via the world wide web.

Communications number assigned by societe internationale de telecommunications aeronautiques (sita).

Telephone extension.

Self explanatory.