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Helpful answers
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Jan 21, 2016 10:50 AM in response to T.O.A.O.by ManSinha,3 potential troubleshooting articles -
Using FaceTime and iMessage behind a firewall - Apple Support
TCP and UDP ports used by Apple software products - Apple Support
http://osxdaily.com/2010/07/18/facetime-troubleshooting-use-facetime-behind-a-fi rewall/
Essentially it asks to recheck ports 53, 80, 443, 4080, 5223, and 16393-16472 (UDP) are open and available for port forwarding
You have essentially established that the devices are okay - ergo the issue must lie with the network
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