DTMF input operation on WebexCC's browser

I would like to be able to do DTMF input operations on the Webex Contact Ceter browser.

If you make a call as an agent to a destination number with IVR, you need to bring the Webexapp side of the call to the front and dial it just to use DTMF. Since agents are usually looking mainly at the browser screen, the Webexapp is often minimized, and it is inconvenient for the customer to not be able to complete the call in the browser.