SDP (Session Description Protocol) in IMS Network
SDP refers to "Session Description Protocol". It is a companion protocol to the SIP protocol in the IMS network. It exists within the SIP message body to describe the session parameters.
SDP describes the characteristics of the multimedia session, such as the type of media (e.g., audio, video, text), the codec(s) of the media session, the transport protocol(s) (e.g., RTP, UDP), and the network parameters (e.g., IP address, port numbers). This information helps the session participants to negotiate and establish the session.
In addition, SDP can modify an ongoing session, such as adding or removing media types, changing the codec settings, or updating the network parameters.
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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…