S-CSCF in IMS Network
S-CSCF refers to "Serving Call Session Control Function". It is the central node in the IMS network.
The roles of the S-CSCF include,
- Handles the Registration of the UEs to the IMS network, and stores registration information of the UEs.
- Retrieves user profile information of each registered UE from the HSS/UDM.
- Controls the multimedia sessions, including session establishment, modification, and termination.
- Triggers various IMS services for the UEs according to their user profile information and according to configurations.
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VoLTE (Voice over LTE) Introduction
While the UE attached to LTE network, the UE can initiate, or receive a voice or a video call. The UE achieves this, by connecting to an external network, which is the 'IMS' network. We can call this, Voice over LTE (VoLTE). This is exactly like when you would like to create a call, while…
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What is an ‘EPS Bearer’ in LTE ?
During 'LTE attach' procedure, the network establishes this EPS Bearer between the UE and the PGW. The PGW assigns an IP address for this Bearer. The UE uses this IP address, in order to communicate with the PDN. In addition, the PGW assigns a QoS for this Bearer, which guarantees the QoS for the data…
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