![do facetime do facetime](https://media.idownloadblog.com/wp-content/uploads/2016/05/activation_error.jpg)
Video is H.264 and varies quite a bit in quality depending presumably on whatever bandwidth calculations were passed through SIP. The audio is AAC-ELD as described above, with an observed 68 kbps in each direction (or about 136 kbps give or take) consumed. Same as above since they are never blockedĪ video FaceTime call is 4 media streams in each call. Unclear but possibly XMPP since it uses these as backups I've added what I suspect they are used for. According to their port requirements these are the ones required now. But we know that in the later years Apple changed FaceTime, adding more functionality and presumably more capacity.
![do facetime do facetime](https://tipsmake.com/data/images/how-to-fix-facetime-using-lte-instead-of-wifi-only-picture-1-BpnKTKXpF.jpg)
There is nothing magical about Apple using this codec but it is widely seen as an excellent choice. The assumption I'm making is that for FaceTime audio vs video the difference is minor, the primary distinction being that the codec used for audio, AAC-ELD.
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This, along with STUN information, is how Apple knows how to connect the two devices.
![do facetime do facetime](https://tapsmart-wpengine.netdna-ssl.com/wp-content/uploads/2018/11/groupfacetime-1.jpg)
So when my mom and I chat over FaceTime Audio and the quality is so good it is like she is in the room with me, it really stands out compared to my many other phone calls in the course of a week. When we all switched to cell service audio quality took a huge hit and with modern VoIP home phones the problem hasn't gotten better. For those of you old enough to remember landlines, it reminds me of those but if you had a good headset. Not only is it simple to use and reliable, but the sound quality is incredible. As an ex-pat living in Denmark, I use FaceTime audio a lot.