Android – using the volte protocol in applications

Volte is a relatively new technology. I understand that calls using volte use Internet data (the same data we use to browse the Internet, watch YouTube videos, etc.), which fascinates me. I tried to get more information about its working principle, and then I learned that volte is like an "optimized" data network for voice (which makes it better than VoIP) My question is:

Q: 1) if it is an "optimized" data network, how can we make volte calls using the same general Internet? Q: 2) is the optimization done on the client? If question 2) Yes, what are these optimizations and how to use them in Android applications. Is there a library? (e.g. this)

Q. 3) in addition, does volte mean the end of VoIP, Skype, FaceTime, etc? Can Skype or FaceTime migrate their mobile applications to use volte over VoIP?

resolvent:

In a very general sense, yes, volte does use "Internet data" such as youtube, while traditional voice calls are circuit switched

However, LTE uses QoS mechanism to prioritize volte in order to treat it differently from data from web browsers, etc. you can see the following properties of different bearers (logical connections) from the standard QCI table:

Although a typical web browser will use QCI 8 or 9, volte calls will use QCI 5 for control plane signaling, while QCI 1 for actual voice calls. This can ensure that a more stringent packet delay budget is used and the bit rate is ensured. This is mainly a core network function, but the end-user equipment (UE) must be able to support it. You cannot change the QCI of the device from the client and must be in HSS Change it in (home subscriber server, core network component)

On your last question, Skype and other similar applications are regarded as Ott (super top) applications. They are regarded as regular QCI 8 / 9 applications and do not give any special priority. Therefore, this means that if you have good coverage on uncrowded cells (and cores, etc.), you may not notice the difference between Skype calls and volte calls. However, Finally, I do believe that some operators have built native applications that can take advantage of various QCI profiles