The voiceless labiodental approximant is the typical realization of /f/ in the Indian South African variety of English. As the voiced /v/ is also realized as an approximant ([ʋ]), it is also an example of a language contrasting voiceless and voiced labiodental approximants.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
It is an oral consonant, which means air is allowed to escape through the mouth only.
Because the sound is not produced with airflow over the tongue, the central–lateral dichotomy does not apply.
Mesthrie, Rajend (2004), "Indian South African English: phonology", in Schneider, Edgar W.; Burridge, Kate; Kortmann, Bernd; Mesthrie, Rajend; Upton, Clive (eds.), A handbook of varieties of English, 1: Phonology, Mouton de Gruyter, pp. 953–963, ISBN3-11-017532-0