Polycom 320 call waiting question

Are there any SIP option(s) I can use to turn off the "call waiting" display when a call waiting call apears at a phone? I want call waiting, I just don't want any visual notification - the beep is okay (I don't even really need that).

Here is the situation - with a call, I pass some information in the callerid that is displayed at the phone. The person answering the phone will reference this information sometime during the phone call. If they happen to glance at the information when there is a call waiting, they will sometimes see the information for the call waiting call instead of the current call - and that causes confusion. So I'd rather not display any indication that a call is waiting.

In other words, I don't ever want anything on the display other than the current call.

Thanks!