IMS Mini Course

On June 6th I instructed a mini course in Metodista about IMS and SDS. In this event participated students from the graduation courses of "computer engineering" and "information systems" that are in the penultimate semester and developing their IMS projects.
Were considered the concepts of IMS technology, such as architecture, SIP, CSCF and HSS. We also talked about SDS, which is the Ericsson IDE for development of IMS applications.

Introdução Ims

View more documents from Gustavo da silva Baptista.

Translation by
Rafael P. Silva

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Control Layer - Part 2 (CSCF)

We already talked about HSS, now is time to describe other component. The CSCF (Call Session Control Function) is a SIP server and it's responsable for the first iterations int the IMS network. It has the function of registration the termination and establishment of sessions. The CSCF server is divided on 3 parts: S-CSCF (Serving), I-CSCF (Interrogating) and P-CSCF (Proxy).

Source: http://www.3gdb.org/

In coming posts we will go into detail on each part of the server CSCF.

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Control Layer - Part 1 (HSS)

After writing about the IMS technology architecture, we will analyze more deeply the control layer . As seen, in this layer is responsible to make the connection between devices and services, abstracting the used network.

Today, we write about the HSS (Home Subscriber Server)
HSS is like a devices' central database of IMS network, it's responsible for the authentication information, authorization and physical location. It stores the users profiles and their services, independently of the service provider.

HSS is an evolution of the HLR (Home Location Register), which is a node specified by the GSM architecture.

According to the 3GPP specification, HSS provides the establishment of calls and / or meetings, creation of security information devices and identification and authorization to access them. It interacts with CSCF (Call Session Control Function) through Diameter protocol.

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