SIP full parsingdefinition, workflow, configuration and usage-Bek Industrial Communications

The Session Initiation Protocol (SIP) is a communication protocol used for establishing, modifying, and terminating multimedia sessions. It is a text-based protocol that uses a request-response model similar to HTTP. SIP was first proposed by the Internet Engineering Task Force (IETF) in 1996 and was officially released in RFC 2543. The goal of SIP is to establish a general session control protocol that enables multimedia communication between various networks and devices.

This article introduces the basic principles of SIP, its workflow, and how to configure and use SIP protocol for communication. By understanding the knowledge related to SIP, we can better utilize this protocol for voice calls, video calls, instant messaging transmission, and other multimedia communications.

一、Definition and History of SIP

SIP is a text-based protocol that uses a request-response model similar to HTTP. It was first proposed by the IETF in 1996 and was officially released in RFC 2543. The purpose of SIP is to establish a general session control protocol that enables multimedia communication between various networks and devices.

二、SIP Workflow

The workflow of SIP can be simply divided into four steps: establishing a session, modifying a session, terminating a session, and confirming a session. We will discuss each step in detail below.

1.Establishing a Session

When establishing a session, the SIP client (usually a software application) sends an INVITE request to the SIP server to request the establishment of a session. The INVITE request includes information such as the SIP address of the called party and the media type. Upon receiving the INVITE request, the SIP server sends a Ringing response to indicate that the call is in progress. Once the called party answers, the SIP server sends a 200 OK response to establish the session.

2.Modifying a Session

After the session is established, if you need to modify session parameters, the SIP client can send an ｕｐｄａｔｅ request to the SIP server. The ｕｐｄａｔｅ request includes the session parameters to be modified, such as audio encoding format, resolution, etc. Upon receiving the ｕｐｄａｔｅ request, the SIP server sends a 200 OK response to indicate that the session parameters have been successfully modified.

3.Terminating a Session

When a session ends, the SIP client can send a BYE request to the SIP server to request termination of the session. Upon receiving the BYE request, the SIP server sends a 200 OK response to the other party to indicate that the session has been successfully terminated.

4.Confirming a Session

After the session is established, the SIP client can send an ACK request to the SIP server to confirm the session. Upon receiving the ACK request, the SIP server sends a 200 OK response to indicate that the session has been confirmed.

三、Configuring and Using SIP Protocol for Communication

To use SIP protocol for communication, you need to configure the SIP client and SIP server first. Below are some common configuration steps and precautions:

1.Configure SIP Client

Download and install SIP client software, such as X-Lite, Blink, etc.
Launch the SIP client and enter the setting interface.
Enter the address and port number of the SIP server.
Configure SIP account and password.
Configure audio and video devices.
Save the configuration and start the SIP client.

2.Configure SIP Server

Install and configure SIP server software, such as Asterisk, FreeSWITCH, etc.
Configure the network parameters of the SIP server, such as IP address, port number, etc.
Configure SIP user account and password.
Configure SIP routing rules and forwarding strategies.
Start the SIP server and monitor its running status.

3.Use SIP for Communication

Launch the SIP client and log in to the SIP account.

Enter the SIP address or mobile phone number of the called party.

ｓｅｌｅｃｔ audio or video call mode.

Start the call and wait for the other party to answer.

End the call by clicking the hang-up button after the call ends.

四、SIP Usage in Practical Application Scenarios

SIP protocol has a wide range of uses in practical applications. Below are several common application scenarios and usage methods:

1.Enterprise Telephone System

Configure an SIP server as the core device of the enterprise telephone system.

Configure SIP client software or hardware phones as terminal devices for employees.

Use SIP for internal and external phone communication within the enterprise.

2.Voice Conference System

Configure an SIP server that supports multi-party calls.

Configure multiple SIP clients as terminal devices for conference participants.

Use SIP for multi-party voice conferences.

3.IP Camera Monitoring System

Configure an SIP server that supports video transmission.

Connect IP cameras to the SIP server.

Use SIP for remote video monitoring and recording.

In conclusion, SIP (Session Initiation Protocol) is a communication protocol used for establishing, modifying, and terminating multimedia sessions. Its emergence makes multim

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