Touch Tones on AudioCodes Deskphone Not Transmitted Properly to Other End

Hello I have an environment with new Audiocodes 445HD deskphones connected to Zoom. Everything is working fine except, when someone presses digits while in a call the digits (touch tones) are not heard/understood on the other end of the phone. So if dialing *86 to get your voicemail you may be asked for your PIN. You press the buttons for your PIN, but the signal is not heard by the voicemail system to access it. If a user dials a bank IVR system, again the touch tones when pressed are not heard. If I dial my cell from the deskphone (while not going through my firewall), I cannot hear the touchtones being pressed on my cell phone end of the call. I have ruled out my Sonicwall as the problem because this model of 445HD has wifi to which I connected it to a mobile hotspot, outside of the firewall. 

I have been researching this like crazy and cannot figure out what the problem could be.