UC500.com

We have a customer with a 7936 conference phone. They want the ability to pick up calls from the incoming lines. They do not want the 7936 to ring if they are in certain conferences (with a customer for instance.) Is there a way to create an overlay with a silent ring? Or....Can I add a DnD button to the 7936? That way they could turn the DnD on if they do not want to accept calls.

What would be the best option or if there is a plan C, that would be welcomed as well.

Thanks for any help.