Default [Q] Cyanogenmod Voice+ Data usage

Hi, I searched everywhere but couldn't find an answer. I have voice+ enabled on my phone, and it works perfectly fine. The only concern I have is data usage. When I check the data usage it's the top app on the list and nearly all of it's usage is background data. I don't have unlimited data, so this is disheartening if it's true. Does anyone know if voice+ constantly checks google voice online?