SDP protocol

What is SDP Protocol?

The Role of SDP Protocol

Application Scenarios of SDP Protocol

1. Internet Telephony: SDP is essential in internet telephony. When two users initiate a call, they need to negotiate the encoding format and transmission address of the audio. SDP provides a description format that allows users to understand each other's requirements, enabling audio transmission and interaction.
2. Video Conferencing: In video conferencing, participants must negotiate video encoding formats, resolution, and transmission addresses. SDP offers a unified description format, enabling participants to accurately understand each other's requirements and adapt. Through SDP, participants can determine video encoding formats, resolution, and transmission addresses, facilitating video transmission and interaction.
3. Real-time Streaming: SDP is also widely used in real-time streaming. In this context, participants need to negotiate media encoding formats and transmission addresses. SDP provides a description format that allows participants to accurately understand each other's requirements, adapt, and facilitate media transmission and interaction.

Steps in SDP Protocol Operation

1. Create Session: First, participants need to create a session and define session-related parameters such as session name and description.
2. Describe Media: Next, participants describe the media information within the session. This includes the type of media (e.g., audio, video), encoding formats (e.g., G.711, H.264), transmission addresses (e.g., IP addresses, port numbers), and other relevant parameters.
3. Send and Receive: Participants need to send their media descriptions to each other and receive descriptions from one another. By comparing their media descriptions, participants can understand each other's requirements and capabilities, negotiate, and adapt accordingly.
4. Media Interaction: Based on their media descriptions, participants can determine the mode of media interaction. This includes the media encoding format and transmission protocol. Participants can choose appropriate encoding formats and transmission protocols based on their own requirements and capabilities, enabling media interaction and transmission.

Summary