Vikas Shokeen

Building Concepts for Lifetime – Simplifying Technology & Specs

This is a Non-Profit Site aimed at Demystifying 3GPP telecom Specs in simplified version

08 - VoLTE Evolution (New)

Section # 1 (Evolution of Telephony) · Difference between 2G / 3G –vs- 4G Non-VoLTE –vs- VoLTE Networks · Services in Non-VoLTE 4G Vs...

07. VoLTE IMS KPI & Performance

RSR : Registration Success Ratio (%) - CSSR : Call Setup Success Rate (%) - CST : Call Setup Time (s) - MHT/ACD : Average Call duration (s)

06. VoLTE Interfaces , Protocols & IMS Stack

Sh , Ro , Cx , Rx , Sv , ISC , Mw , Mg , Mi , Mj , Mr / Mr‘ , UT,S1MME , S5/S8 , S10 , S11 , S6a , Gx , Gy , X2 , SGs , S1U , S5/S8 & SGi ,

05. Single Radio Voice Call Continuity (SRVCC) and CSFB Vs SRVCC

Single Radio Voice Call Continuity (SRVCC) - CSFB (circuit switched fallback) - PS to CS handover - CSFB Vs SRVCC - SRVCC , aSRVCC , eSRVCC

04. VoLTE SIP Call Flow – Mobile Originating (MO) & Terminating (MT)

SIP Call Flow - Mobile Originating (MO) & Terminating (MT) - INVITE - 100 Trying - 183 Progress SDP - PRACK - 200 OK - UPDATE - 180 Ringing

03. VoLTE SIP IMS registration Call Flow Procedure & Default Vs Dedicated Bearer in LTE

SIP IMS registration - Default Vs Dedicated Bearer in LTE - SIP and IMS Registration - TAS Registration - QCI-1 ( Voice ) , QCI-5 (SIP)

02. VoLTE IMS Architecture

VoLTE IMS Architecture - SIP Handset , Underlying LTE Network , IMS Core - SIP Servers , P-CSCF , I-CSCF , S-CSCF , TAS , MMTEL , BGw , MRF

01. What is VoLTE – IMS Overview , Basics & Fundamentals

Network Evolution to VoLTE , VoLTE - Benefits for Users , Operators . VoLTE Challenges & Handling Congestion Scenarios