There is some sensors like this one.
They are pretty dumb. It will tell you there is a sound or no sound.
There is also something smarter by measuring the sound like this one.
If you are looking something smarter than that (like recognizing whose making the sound, Is it human conversation), you may have to DIY yourself. It is do-able. But not easy.
Once you choose your sensor, you can use Arduino to send the information to your hub. Look at HubDuino. @ogiewon can hook you up with a DTH.
Or, If you are looking to use a Zigbee, you can use one of my module to send information from the above sensors too.
I hope it help. I am not sure that there is an out of the box sound sensor.
