Sometimes you just need some peace and quiet to get your tasks done. You can quickly send all calls to your Google number to voicemail so you can get back to them later when you are ready to get back to it.
1. Go to your Google Voice.
2. Go to the upper-right of the page and select Settings.
3. Select the General tab.
4. Go to the Do Not Disturb section.
5. Check the Enable Do Not Disturb checkbox.
6. Click the Save Changes button.
You will now notice a highlighted label in the upper-right corner of the page, notifying you that Do Not Disturb is enabled. When you are ready to turn it off, simply click the Disable now link.