Wednesday, December 23, 2009

Why use IP Multimedia Subsystem - IMS for IPTV?

If you are selecting or deploying TV systems, you have probably figured out integrating wired, wireless, and Internet television services is difficult or impossible with existing systems. Unfortunately, with many new television competitors entering into the industry, it is essential to offer an integrated set of services in order to compete. Delivering television services over different types of networks is critical to survival. IP Multimedia Subsystem (IMS) is an industry standard that allows communication operators to offer advanced services over multiple types of access networks.

Just as Internet protocols standardized how computers connected to the Internet, IMS standardizes how systems can deliver media to different types of users on different types of networks. Because IMS can use a mix of different network types and protocols, operators can begin to offer integrated television services on almost any type of media network.

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.

You can read more about IMS for IPTV in this article.

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