Forget about FaceTime on 10.9. I just googled - many people have been having that for ages. Even if officially supported as a minimal requirement, there's no guarantee it'll function properly: there's a strange coincidence that every 3 or 4 years, in the fall, when Apple releases the new OS/iOS iteration the compatibility between older and newer tiers of "officially supported" individual (per device and version) features breaks irreversibly. They're forcing you to upgrade in defiance of their own support documents: if FT was 'temporarily' out then it would be so in every version, but in Mojave it works since the combo macOS 10.14/iOS 13-14 is still legit in their view - for now. Just wait until they roll out iOS 17 - that will break too, even if by that time the minimal requirement will be 10.14, because "the minimal requirement" is double-speak for "unsupported and incompatible - so screw you". That's the reality.
If something was be on my end, or with the zonal connectivity in my region, then every IM/VoIP service would be broken down but that's not the case and no proxy is going to save the day.
Here's what connections FaceTime makes when a FT call initiated:
It's either "listening" or opening IPv6 ports I have zero understanding of their purpose and role, apart from the fact that the second port changes every time the new session is started.
If something was be on my end, or with the zonal connectivity in my region, then every IM/VoIP service would be broken down but that's not the case and no proxy is going to save the day.
Here's what connections FaceTime makes when a FT call initiated:
It's either "listening" or opening IPv6 ports I have zero understanding of their purpose and role, apart from the fact that the second port changes every time the new session is started.
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