I tried Redirect ring and it did not do it.
The phone even makes the sound when it is in DND state.
I am getting a lot of complaints about this feature, and I can't really blame them. The person will be on a call, get a second call,have to listen to the three rings and then have an alert sound out as well.
On a Handsfree call it just does not sound professional when everybody says "What was that sound?".