I have lost facetime on my macbook pro. Calls ring but message says fail

Hello lindseynicola,

Thanks for using Apple Support Communities.

I understand that you're having issues with making calls using FaceTime on your Mac. I'd like you to take a look at the following troubleshooting information, in order to get this issue resolved:

Troubleshooting FaceTime for Mac

You can make FaceTime calls using the FaceTime app. You can call FaceTime users whose contact information is in Contacts. You can add contacts and edit contact information in either FaceTime or Contacts. To place a video call, you may use a phone number or email address.

If you encounter issues making or receiving FaceTime calls, try the following:

• Verify that FaceTime is enabled in FaceTime > Preferences.

  If the issue persists, or if you see the message "Waiting for Activation", try toggling FaceTime off and then on.

• Verify that the Date, Time, and Time Zone are set correctly:

  From the Apple () menu, choose System Preferences > Date & Time > Date & Time.

• Enable "Set Automatically".
• Click the Time Zone tab and confirm the closest city is correct.
• Verify that both parties are connected to an active broadband Internet connection.
  • See Mac OS X: Troubleshooting a cable modem, DSL, or LAN Internet connection.
  • Consult Using FaceTime behind a firewall for necessary ports to open in firewalls, security software and routers.
  • If you encounter issues using a Wi-Fi network, use standard Wi-Fi network troubleshooting to resolve interference and other issues.
• Verify the phone number or email address being used is the correct one activated for FaceTime.

  You can verify that you are using a valid Apple ID at appleid.apple.com. You can also create an Apple ID or reset your password from this website.

• Verify that both parties have installed the latest software updates for their Mac and/or device. See:
  • Mac OS X: Updating your software
  • iOS: How to update your iPhone, iPad, or iPod touch

FaceTime for Mac: Troubleshooting FaceTime

http://support.apple.com/kb/TS4185

Take care,

Alex H.