If it's too inconvenient, then just don't reply. I'd rather have no answer from you than a condescending one.
FWIW, many people before me also asked the question and no one bothered to say the iPhone still controls the volume until a few posts later. When everyone says "no volume control but Siri", to me that means NO VOLUME CONTROL except through Siri.
Obvious answers are obvious for a reason. But I apologize for the condescending tone. I've woken up extra grumpy today.