Is it permissible for a woman to record commercial advertisements with her voice?

It is not forbidden for a woman to record commercial advertisements with her voice, because a woman's voice is not considered 'awrah' (private and unlawful to expose), provided that the advertisement is for something permissible and the recording is free from softness of speech or other impermissible things according to Sharia. However, it is preferable for her to stay away from this field.