In the SIP response message, which of the following messages are numbered 300-399? ()
In the U1900+SC solution, eSpace 8950 is used to call the conference access number of the video conference system. When the conference list page appears on the phone screen, which statement is correct ()
The standard auxiliary stream token management protocol recommended by the SIP protocol is () (single choice)
Regarding the upgrade method of eSpace IP phones, which of the following statements is correct () Multiple choice
When performing a key-in operation, the meeting list displayed on the terminal is based on what is found ()
