The alarm light on the MCU dashboard is red and the meeting is scheduled to prompt "License resources are insufficient", possibly because of the MCU The license does not match the actual hardware
configuration of the MCU.
Response messages are used to respond to request messages that indicate the status of success or failure of a call, and different types of response states are distinguished by status codes, which contain
three-digit integers, the first bit of the status code Used to define the response type, the other two digits are used to further explain the response in more detail. ( )
Call acceptance, which is used by the terminal to request the validity certificate of the call from GK and the address and bandwidth information of the caller. ( )
GK must support BRQ, BCF r BRJ messages, and accept all bandwidth modification requests. ( )
In the default configuration of the firewall, traffic from a high-security network (intranet) to a low-security network (Internet) is generally not restricted, otherwise the firewall blocks.
The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.
A session-independent nature is that a SIP-URL represents a resource or user that needs to be accessed, and the message body can carry anything.
Non-T.140 subtitles only support sending and receiving subtitles from H.323 type terminals.
Each RTP datagram consists of two parts, the header and the payload, where the meaning of the first 12 bytes of the header is fixed , and the payload can be audio or video data.
Only one P frame is sent at the beginning of the build during the call, and the subsequent video images are encoded using I frames.
The function of the registration server is to map the addresses in the request to zero or more new addresses and then return them to the client.
Cascade channels are used by priority, and resources are mutually exclusive when at the same priority.
SDP ( Session Description Protocol ) is a transport layer control protocol used to describe multimedia sessions . ( )
MSDR is the master-slave decision to reject the message, the ability to exchange results that are inconsistent with the settings of this end, then reply to MSDR. ( )
Several video compression standards that are currently widely used include: H.261H.263 and H.264 and MPEG-1. MPEG-2 and MPEG-4. Its H.26X series of standards is primarily used for real-time video
communications, and the MPEG series of standards is primarily used for video storage (DVD), video broadcasting, and video streaming.
