P-CSCF in IMS Network
P-CSCF refers to "Proxy Call Session Control Function". It is the first point of contact in the IMS network for the UE.
The roles of the P-CSCF include,
- It works as a proxy between the UE and the IMS network.
- Performs authentication and security for the UE, in order for the UE to be able to access the IMS network.
- Routes the SIP messages received from the UE to the appropriate IMS entity (e.g. I-CSCF or the S-CSCF).
- Enforces policies to the multimedia session (e.g. bandwidth allocation and QoS).
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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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