My SmartPlus app always worked well before, but last week, I can initiate the call from the app, but can not see the video. I have checked my smartphone camera permission for the app, it is normal. And I am quite sure the camera of the doo ...

SIP Registration(1) Before any SIP phone users who is try to make a SIP call for the first time, terminal agent A sends a REGISTER request to the proxy server;(2) The proxy server knows that the user information is not in the database throu ...

What is HTTP HTTP protocol is the abbreviation of Hyper Text Transfer Protocol (Hyper Text Transfer Protocol), which is a transfer protocol used to transfer hypertext from a World Wide Web (WWW: World Wide Web) server to a local browser. ...