Number identifying the service and service user.

Self explanatory.

Postal service document delivery.

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.

Voice/data transmission by telephone.

Transmission of text/data via teletext.

Exchange of mail by electronic means.

Communications number assigned by aeronautical radio inc.

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).

A communication channel identifying a courier.

Self explanatory.

Self explanatory.

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

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

Telephone extension.

Self explanatory.