SIP in IMS network
SIP refers to "Session Initiation Protocol". It is a fundamental protocol in the IMS network, that is responsible for the establishment, modification, and termination of multimedia sessions, such as voice and video calls.
In addition, SIP is responsible for the registration of user endpoints with the IMS network. It handles the process of associating a user's public identity (e.g., phone number, SIP URI) with their current IP address or contact information.
Also SIP provides the mechanisms for locating and routing signalling messages to the appropriate IMS network elements, such as the P-CSCF and the S-CSCF.
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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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QoS ‘Quality of Service’ in GPRS
QoS refers to 'Quality of Service'. After 'PDP context activation' procedure completes, a 'PDP context' shall exist on the MS, the SGSN, and the GGSN. In addition, the GGSN assigns a QoS for this 'PDP context'. This QoS describes the priority that the nodes shall give to traffic belonging to this 'PDP context'. The subscription…
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