VoLTE IMS KPI & Performance

We are going to cover complete list of VoLTE IMS KPI and performance Indicators . This includes :-  VoLTE IMS Control Plane KPI RSR : Registration Success Ratio (%) CSSR : Call Setup Success Rate (%) CST : Call Setup Time (s) MHT/ACD : Average Call duration (s) VoLTE IMS …

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

SRVCC (Single Radio Voice Call Continuity) Explained in VoLTE IMS Network & Difference between SRVCC Vs CSFB (circuit switched fallback) :
• PS to CS handover
• CSFB Vs SRVCC
• Evolution of Voice Call – SRVCC , aSRVCC , eSRVCC , vSRVCC , rSRVCC Phase
• SRVCC handover Call flow
• STNSR ( Session transfer number for SRVCC )
• C-MSISDN ( Correlation MSISDN )

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

VoLTE SIP IMS Call flow for Mobile Originating & Mobile Terminating Calls ( • SIP INVITE message , • SIP 100 Trying , • SIP 183 Progress SDP , • SIP PRACK , • SIP 200 OK PRACK , • SIP UPDATE SDP , • SIP 200 OK UPDATE , • SIP 180 Ringing , • SIP 200 OK INVITE , • SIP ACK )

We will also cover Codec Negotiation in Detail in the End where We will be covering AMR , AMR-WB & EVS Codec which supports both super-wideband and full-band speech communication and provide crystal clear HD Voice

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

VoLTE SIP IMS Registration procure :-

• LTE Attach & Default Internet EPS bearer
• Role of QCI-1 ( Voice ) , QCI-5 (SIP Signaling) , QCI-6 to 9 (Internet)
• Default Vs Dedicated Bearer in LTE
• Default IMS EPS bearer in LTE
• SIP and IMS Registration
• TAS Registration

VoLTE IMS Architecture

VoLTE IMS Architecture

• VoLTE SIP Handset : SIP Support , UAC , UAS , User Agent , SIP-UA
• Underlying LTE Network : MME , SGW , PGW , PCRF , HSS , Dedicated Bearer , QCI , Default Bearer
• IMS Core : SIP Servers , P-CSCF , I-CSCF , S-CSCF , TAS , MMTEL , BGw , MRF , ATCF , ATGW , IBCF , MGCF , IM-MGW , TrGW
• Voice Core or PSTN Network for Break-in or Break-out Calls