Answer
(Fatwa: 442/442=M-1429)
Women have bee prohibited to speak loudly, read out something in melody and talk softly. The scholars of Fiqh say that voice of a woman is also satr. That is why women have been stopped to call Azan and recite talbia loudly in Hajj. Yes, in cases of necessity, they can talk as they can have some words with a doctor etc. However, without any need, it is not right for women to broadcast news at radio stations as well it is not permissible for non-Mahram men to hear their voice without a need.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband