The terms are "Cardinal" and "Ordinal" and "Distributive". One, two, three, etc. are "Cardinal Numbers." First, second, third, etc. are "Ordinal Numbers" (which tell Order). "Distributive Numbers" tell how many of each like Singly,Doubly,Triply and Single,Double,Triple.
We often get the various -nary terms like binary, ternary, and quaternary from Latin distributive numbers (bini, terni, quaterni, quini, seni, etc.), with the exception of unary which comes from their cardinal number one (unus) as opposed to their distributive number one (singuli, which is where singular, single, singularity, etc. come from). Words like primary, secondary, and tertiary usually come from their ordinal numbers (primus, secundus, tertius, quartus, quintus, etc.).
The man who coined the term knowledge workers differentiated them from manual workers.
Management guru Peter Drucker coined the term "knowledge worker." In his 1969 book, The Age of Discontinuity, Drucker differentiates knowledge workers from manual workers and insists that new industries will employ mostly knowledge workers.
Best Answer
Websters gives the following definitions of unidirectional
and bidirectional
I think those meet your needs. Specific to phone calls would be duplex for bidirectional. Half duplex communication is bidirectional but only one direction at a time.