stop notifications while on a call

[scidmail]

There has to be a way to do this, but I just cannot find it. It's one of those annoying things that will only happen once in a while, but when it does, it just bugs the heck out of me. Occassionaly when I am on a call a text message or calendar notification will come through. The phone will chime it's usual notification and since I often use lengthy ringtones to announce these events, it can be very annoying when it happens during a call. How do I make WM6 not interrupt my call with announcements such as calendar or text message information until I've finished the call?

Barb