Question about the Razr V3 (Ringer ID)

I just recently obtained the Razr (I know, I'm late) and I have a question.

Is it possible to change the text messaging sound on somebody who has a ringer ID. Example: I have a certain ring tone for person A, and when A sends me a text message, it plays the ring tone to its extent. I don't want that, because I don't know if I'm recieving a text message or a phone call from A. I want A to have a special ringtone that only plays when he/she calls, and a different sound for when I recieve a text message.

If that can't be, can I at least turn off sounds made from recieving text messages? My only solution to this has been having one universal ringtone for everybody, but I highly prefer utilizing the Ringer ID feature.

Thanks you very much.