Hello mgfr,
Thanks for using Apple Support Communities.
First you need to determine which device might be running into the issue. If you are unable to connect to any FaceTime caller, not only the person you posted about in your original post, then the issue is perhaps with FaceTime on your computer. To troubleshoot that please follow the steps below.
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.
- 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:
FaceTime for Mac: Troubleshooting FaceTime
http://support.apple.com/kb/TS4185
If the person who you are trying to contact cannot receive any FaceTime calls, and not just from you, then the issue is on their end. Have them follow the steps in the article below.
iOS: Troubleshooting FaceTime
http://support.apple.com/kb/TS3367
Take care,
Alex H.