Don't have audio or video symbols on my Facetime
This Knowledge Base article from apple should help you. I believe the following section from the article should resolve your issue. 


  Wi-Fi network issues
  
  
  If you encounter issues using a Wi-Fi network, use standard Wi-Fi network troubleshooting to resolve interference and other issues.
  If you are using router, firewall, or security software that restricts Internet access, verify that the ports documented in Using
  FaceTime behind a Firewall are open.
  FaceTime requires a broadband connection. Performance may vary according to network throughput and usage.
  


Read more of this Knowledge Base article - http://support.apple.com/ts3367