It's acceptable etiquette to contact a Client or their company directly only if they've approached you first. If your voice is the one they want to work with, they will contact you.
Often a listed company or brand is not directly involved in the Project, as many times they're handled by advertising or marketing firms, and any contact could confuse or upset representatives of the company and possibly harm either Voice123 or the Client's reputation.
A Client's privacy and time should be respected. If this conduct is brought to the attention of Voice123, the consequences may include the cancellation of a membership with no refund, as well as being prohibited from participating in the Voice123 marketplace.