VOLTE SIP Message

VOLTE SIP Message

Aug

First we have to understand what is SIP ?

In an IMS network, Session Initiation Protocol (SIP) messages are exchanged between UEs using signaling PDP contexts through the PS domain of the LTE
network.
Similarly, media streams (voice/video) are transmitted using media PDP contexts. Like common interactive PDP contexts, media PDP contexts do not require special processing. However, signaling PDP contexts do require special processing.

The SIP is an application-layer control protocol for carrying out multimedia communications on the IP network.
The SIP is used to create, change, and terminate session processes with one or more than one participants.
The SIP cooperates with the below protocols.
Session Description Protocol (SDP),
Real-time Transport Protocol (RTP)
RTP Control Protocol (RTCP)
Real Time Streaming Protocol (RTSP),
Domain Name System (DNS)

The SIP is a simple, flexible protocol for creating, modifying, and terminating sessions. It works independently of underlying transport protocols.

The main functions of the SIP are to set up, control, and tear down sessions. Protocols used in conjunction with the SIP, such as SDP, RTP/RTCP, and RTSP can be summarized as follows.

The SIP can be based on the User Datagram Protocol (UDP), the Transmission Control Protocol (TCP), or the Stream Control Transmission Protocol (SCTP). However,most cases now use theUDP.

Message content of SIP basic request and SIP extended request.
The basic SIP messages, described in RFC 3261

Message content of a SIP response message

Provisional : Request received, continuing to process the request.

Success : The action was successfully received, understood, and accepted.Redirection Further action needs to be taken in order to complete the request.

Client error :The request contains bad syntax or cannot be fulfilled at this server.

Server error : The server failed to fulfill an apparently valid request.

Global failure : The request cannot

The registration server on the IMS network is called the Serving Call Session Control Function (S-CSCF), while proxy servers on the IMS network are the Proxy-CSCF (P-CSCF), Interrogating-CSCF (I-CSCF), and Serving-CSCF (S-CSCF).Initial Session request flow sent by the UE.

Reference 3GPP,Wiley books.

5G NR CORE Architecture

VOLTE Architecture

Abhijeet Kumar

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5G NR Knowledge.

Knowledge of eMBB, URLCC, MMTC.

5G RAN ARCHITECTURE, NR NSA mobility, Massive Mimo, Beamforming, 5G Frame structure, Ultra lean design, 5G QOS compare with LTE, Ericsson & Huawei RAN system for 5G. 5G planning Knowledge.

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• Analysis of LTE Radio KPIs, investigation, and improvement of network quality problems.

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Comments

HAMID
August 2, 2020

SIP cant fullfil the control Plan function alone is to be used in conjunction with other control protocole as SDP, RTP/RTCP, and RTSP :
-so which protocol will maintain the PDP session
Biswaranjan07
August 3, 2020

How 200 ok was sent from B party AS to A party SCSCF at the same time when the prack was sent to UE B, it should send 200 after its responded by UE B.

Correct me if I am wrong
sneh
December 16, 2021

Why does send Unauthorized 401 msg