Who looks after the advertisement work in a BPO ?

Hi i m going to start a website which will provide candidates to BPO n KPO n definitely i would like to grab some advertisement from some reputed BPO`s so can you tell me who will be the right person to talk about this like which manager exactly he/she will be HR head or any another designated person ..n where should i contact for this can i get all this detail on the website of a BPO company...plz help me ...thnxx