What Is the IP Multimedia Subsystem?

The IP multimedia subsystem (IP multimedia subsystem) is composed of all functional entities capable of providing multimedia services, including a collection of functional entities related to signaling and bearer. IP multimedia services are based on the session control capabilities defined by the IETF and are implemented using packet-switched domains and multimedia bearers. The IP Multimedia Subsystem enables operators to provide their users with Internet-based applications, services and protocols for multimedia services.

The IP multimedia subsystem (IP multimedia subsystem) is composed of all functional entities capable of providing multimedia services, including a collection of functional entities related to signaling and bearer. IP multimedia services are based on the session control capabilities defined by the IETF and are implemented using packet-switched domains and multimedia bearers. The IP Multimedia Subsystem enables operators to provide their users with Internet-based applications, services and protocols for multimedia services.

Chinese name

IP Multimedia Subsystem

Foreign name

IP multimedia subsystem

Make up

Functional entities that can provide multimedia services

based on

IETF-defined session control capabilities

Way to achieve

Leveraging packet switched domains and multimedia

Introduction to IP Multimedia Subsystem System

The IP multimedia subsystem is composed of all functional entities capable of providing multimedia services, including a collection of functional entities related to signaling and bearer. IP multimedia services are based on the session control capabilities defined by the IETF and are implemented using packet-switched domains and multimedia bearers.

In order to achieve the independence of access and support the smoothness of wireless terminal and Internet interoperability, the IP multimedia subsystem uses Internet standards consistent with IETF as much as possible. Therefore, the defined interface is as consistent as possible with the Internet standards of the IETF. For example, the SIP protocol of the IETF is used.

IP Multimedia Subsystem System Application

The IP Multimedia Subsystem enables operators to provide their users with Internet-based applications, services and protocols for multimedia services. It is not here to turn these services into standards for IP multimedia subsystems, but to allow operators and third-party service providers to develop these services. The IP multimedia subsystem can concentrate voice, image, message, data, and Web-based technologies to serve wireless users, and combine the development of the Internet with the development of wireless communications.

IP Multimedia Subsystem System Structure

The structure of the IP multimedia subsystem includes these functional units: Call Session Control Function (CSCF), Media Gateway Control Function (MGCF), IP Multimedia Gateway Function (1M-MGW), Multimedia Resource Function Controller (MRFC), Multimedia Resource Function Processor (MRFP), contract positioning function (SLF), exit gateway control function (BGCF), application server (AS), and signaling gateway function (SGW).