(X)CrossPost(X) BlueTooth questions

I have had a lot of smart phones but never used bluetooth headsets and have a few questions.

Can you get a bluetooth earpiece for answering phone calls that lets you answer from the headset once paired?

Do all the earpieces support streaming or playing music/sprint tv audio/Google listen?

Are they all mono or do some single earpieces have stereo?

Is there an industry standard for noise reduction that I should look for in the feature list?

Any other tips if I just want to buy one and be satisfied its the right one?

The one i've eye'd is the Jabra BT530.

Thanks in advance!