In Congo, mama is the most common word spoken. All women are referred to as mama so-and-so. For me, I equate it to own salutations of Miss and Mrs. It is not so much used in our traditional motherly way.
The same is true for the use of papa referring to Congolese men. Papa is not as popular as mama. Men may be addressed by their professional title. It goes well beyond own use of doctor, pastor, judge, etc. Teacher so-and-so or nurse so-and-so are common examples.
Since women commonly do not have a profession, they are just called mamas.