5G網絡學習總結:
參考網址:
1、VoLTE的前世今生...說清楚VoIP、VoLTE、CSFB、VoWiFi、SIP、IMS那些事
https://blog.csdn.net/zx249388847/article/details/58192737/
搜狐:https://www.sohu.com/a/128463947_505812