Thanks! For some reason google voice won't let me dial the appropriate option
I have the same issue.
It's annoying but if you wait till after the menu is repeated it will put you on hold for an agent.
"VoIP doesn't work well with some older equipment that still out there.
If you find that the RFC 2833, SIP INFO, or Inband DTMF tones are not being recognized:
Go to Settings > Advanced Settings > DTMF Type. Change the setting and then try your call again.
Inband DTMF can be sent alongside other forms. This is what the "Also Send Inband DTMF" check box is for."