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Introduction to IMS

Introduction to IMS

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   IP Multimedia Subsystem - IMS

IP multimedia subsystem is service based architecture that uses Internet protocol (IP) based systems to provide enhanced multimedia services. IMS evolved from the evolution of the 3rd generation mobile telephone standards that enabled users to access multimedia services using any type of access network that could use Internet protocols.

This figure shows the basic functions of the IMS system. This diagram shows that a user equipment device (a mobile phone in this example) is calling another device (a landline telephone). The UE sends its connection request (an invite) to the proxy call session control function (P-CSCF). The P-CSCF needs to find the call server so it sends a request to the interrogatory call session control sever (I-CSCF). The I-CSCF contacts the home subscriber server (HSS) which contains the service profile of user and the location of the serving call session control function (S-CSCF). The S-CSCF will then manage the communication session with the UE through the P-CSCF. The IMS system can then connect a call through a media gateway (signaling processes not shown) so the connection can reach the landline telephone.

IP Multimedia Subsystem - IMS Diagram

IP Multimedia Subsystem - IMS Diagram

 

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