2nd incoming call on GoogleeVoice number

Hi guys I have my GV setup using the module and it works great, but if I am on a call when someone called me from my GV number and then someone calls again I get the call waiting beep and have to answer the call and press the 1 to accept the call. I don’t want this because I want any calls coming in while I am on the phone to go to my IVR. Anyone know how to bypass the DTMF on a second incoming call?