Eli5: Why do we need an Internet connection to make video calls? Why can we just do it through the cell towers like a normal call?
In: Technology
Technically it is possible. Since 4G was fully implemented with IMS in the background there is a technology called ViLTE or Video over LTE but it never really took off. It was replaced by video calls on applications such as facetime or whatsapp. That technology would use network native video capability via dedicated bearer (imagine having your own dedicated lane on highway) unlike these applications which use the standard data bearer that is shared between all people on a single antenna. The main reason why ViLTE never took hold is that app use is much more common since the basic internet is now good enough and you don’t really need to have dedicated resources.
Source: Am telco system architect.
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