Where does “portavocía” come from?

portavocía (Spanish) comes from Spanish portavoz, from Spanish voz, from Old Spanish voz, from Latin vōx, from Proto-Italic wōks, from Proto-Indo-European wṓkʷs, from Proto-Indo-European wekʷ- — to speak, to sound out.

portavocía (Spanish): spokesmanship, spokespersonship