The voice calling service was a telecommunications carrier, and it was an era when it was now provided free of charge as an attached function of SNS services/apps.Some people may use more opportunities than "telephone" of communication carriers, such as Facebook's "Messenger" and LINE "LINE Call".
"FaceTime Audio" provided by Apple is a kind of voice call service.This is not a SNS but a related function of the cloud service "ICLOUD", and the calling partner is limited to users with Apple IDs, but it is a specification that is friendly to the iPhone user because it is operated by Apple.It's a service for Apple users operated by Apple, so it's convinced.
In terms of function, "sound quality" is quite good.FaceTime Audio adopts a high-efficiency "AAC-HE" for voice codec (a program that compresses/develops audio data), so that the sound quality is good when the line quality is good, you can clearly hear each other's voice.。However, since Messenger (when the codec is applied to Opus) and LINE (when the Full HD Voice is applied), you can talk with clear audio, so it is not better than other services with sound quality.
In the past, it was considered that FaceTime Audio was able to use the standard iPhone standard incoming screen, but after iOS 10, the CALLKIT framework is open to the third party, and LINE and messenger use almost the same way.I did it.This is not unique to FaceTime Audio.
Is it possible to accurately measure the communication volume in the only part of FaceTime Audio?If you display the detailed screen of the call history, you can check the information that the call time is ◯ minutes and the communication volume is □ megabytes, etc., so you can see the cost required for the actual call (the packet fee paid to the communication carrier).Although it is a subtle function with a large advantage, it is certainly a unique function at this time.
