For the SDP protocol, the m line, also known as the media line, describes information such as the type of media supported by the sender, where the second parameter is ( ).

The following description of the H.323 call flow is correct

The basic concept of white balance technology is that "white objects can be reduced to white regardless of any light source", which is a case for color casts that occur when shooting under a specific light source Compensation is made by reinforcing the corresponding complementary colors. ( )

The MCU's built-in WEB includes multi-user management, address management, conference management, and device management. ( ) When using the MCU wall riding mode, there is no need to add other public and private network traversal devices. ( )

Banners are used to briefly display meeting content, and subtitles are used to highlight the meeting topic.