5. SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB

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

[@brownmedia5658]

I was badly in search of VoLTE KPI and found only in your site. Thanks a lot for educating Indian telecom Engineers.

[@MANMOHAN160]

Hi buddy, thanks a lot for the info. I must admit this was one of the best explained video on SRVCC covering most of nodes and interfaces and network upgrades explanation for SRVCC in a bit depth yet in simple language..keep it up 👍

[@YangBudhipul]

Greeting from Cambodia, you are excellent explainer Vikas

[@rishim10]

Excellent Video Vikas. Pls. keep Posting more Videos

[@mqtLUXEMBOURGCITY]

i can just simplify things as SRVCC did to HO ," you are amazing "

[@komalwaldiya]

Nice sir.... Now concept is clear

[@LIFE-hm8wp]

One of the best

[@kutti9764]

Nice presentations & Superb explanation . thanks a lot sir

[@viratvashisht2791]

Amazing Great video , nicely covers srvcc and csfb mechanism

[@Rohit_A_Comman_Man]

Fantastic explanation thanks a lot brother . Will look forward for more videos on LTE

[@grandphysics3622]

Wonderfully explained. This is going to help us too much. Thanks a lot.

[@mayooragarwal4893]

Very nicely explained regards mayoor

[@abhishekmaurya2199]

Very good explanation keep it up

[@ATUS1213]

very good informative video, thanks

[@ASHRAEBARELI]

Nice used simple language to understand thanks buddy plz make presentation on volte to volte call

[@malakondaiah1512]

Sir, you are good trainer ,sir,pls explain with logs

[@amar123ful]

Wonderful video bro. Clear explanation..If you put any video of what are all the general configurations to be done, it will be helpful.

[@pragya641]

v nicely explained

[@jiafaisal1845]

Very good presentation

[@devs3459]

Hi Sir, Everything is perfect in your tutorial... Can you please provide us a tutorial on different types of call flows in IMS?

[@porapooka]

Good video. Very informative. One doubt please, Is there any chance where MSC has to support CSFB & also Sv interface ?

[@vikasnehra11]

what is the communication b/w ATCF and SCC AS during SRVCC

[@TheAbdulj6]

great expalnation

[@rudheeshrk]

Well Explained....

[@indiancreator77]

If you add a slide of call flow using all the parameter in ladder pattern would be more clarity for us like STN-SR,C-MSISDN etc...Thanks for graphical vdo.

[@manishchetiwal1811]

thanks you so much

[@nardevtechnology4212]

Kahan se late hein itta sara gyan 😅 Your vedios are very much valuable and helpful to understand IMS architecture and IMS HO procedure

[@travelswithmischa]

great session, could we have the ppt somewhere?

[@TheBarbossa4]

Great explanation, I just have one question, what happens on SIP signaling once SRVCC is triggered?

[@arindamsengupta9465]

VoLTE establishes IMS SIP sessions to set up voice call. Now when user moves to non 4G coverage area i.e 3G or 2G area, SRVCc handover the call to CS path via MSC to IMS and the data sessions are transferred to sgsn/ggsn. Now voice over circuit switched network in 2G/3G probably don't use SIP. But if there is VoIP call then SIPs should be transferred as well by virtue of SRVCC.

[@SUBODHSINGH-jn7bc]

In which msg mme get stn-sr and cmsisdn no from hss?

[@uditvellur]

Thanks for the video..It would be great if could explain in a bit little pace.

[@akbarmomin7869]

21:17 HLR gives STNR to MME? it should be MSC let me know if am wrong.

[@BKD743]

hi Sir, can you please exxplain difference between SRVCC and eSRVCC?

[@praveenbotchu9821]

Hello Vikas,many thanks for your video its really useful,please could you tell me..once user moves from 3G Radio to 4G Radio will the user latches back on VoLTE ?

[@arindamsengupta9465]

Yes ..through rSRVCC or reverse SRVCC function

[@sanjaytanwar1945]

Nice

[@ys-50989]

If during call>a-party volte】>>srvcc happens. Q. What happens to the user plane ? after srvcc to 3g, whose user plane/media would be used voice call? does user plane completely shifts to CS-MGW where user got latched after srvcc or it still via ims ?

[@arindamsengupta9465]

User plane control plane split is a concept in 5G and also limitedly used in 4G EPC in the PGW. Now when voice is transferred from 4G to 3G, the entire session is transferred to CS domain where user plane and control plane are maintained together.

[@stevepovey2489]

Would this impact billing at all or would the CDRs look as if the call remained on VoLTE?

[@bobrocky5824]

two CDR will create. One for IMS network and CS network

[@sumansarkar-sz5cm]

This is indeed a very good session. Can you you please elaborate accounting / CDR part for eSRVCC PS to CS call continuity. I think it will complete the understanding.

[@swarnban8634]

I think we need to disable DRX feature in the network......mostly focussing on rural areas, if the CDR arising from those loops.

[@komalwaldiya]

Vikas Sir please add some KPI part in next video, It will help us to improve performance of n/w...

[@TelecomTutorialinfo]

Noted , Target 1st Week Sept

[@boyandikasimbolon]

Great, very helpful. Please provide more animation rather than classic text for any other tutorial. Because picture & animation would be easier to understand than only text like a book

[@boyandikasimbolon]

and why do you delete the sequence number for all step in animation dude?

[@shilpadhadod4652]

Hi vikas, Please share video on ss7 protocol.

[@shilpadhadod4652]

Excellent lecture Sir Jio is not having 2G or 3G service . It is having only 4G. How SRVCC happen in that case.

[@byronsolorzano1838]

Hello I have a Question... After the HO happens, the MSC is stiil having connection with de IMS ?

[@sanjaygautam6005]

Please give video on 5G architecture and call flow

[@shashanksharma2008]

pl share a video on DRVCC

[@premverma3004]

Sir, does SRVCC can handover ongoing Video call also

[@mdjaveed1004]

Yes.VSRVCC is for Video calls.

[@arindamsengupta9465]

Yes..video too continues through srvcc

[@zaq8205]

Thanks a lot .. please cover some negative scenarios. Almost in every interview they ask what could be the reason for srvcc failure . What happens if srvcc fails

[@swarnban8634]

IRAT fails everything fails Call drop.....Optimization is only solution.....I mean you are telling SRVCC fails, that means all 3GPP Rel 8, 10 fails nothing works?

[@danger32727]

SIP teacher Odisha re kia achhanti janicha ki

[@praveenkumar-ym6qs]

Can anyone tell what will happen to jio ntwrk bcz they don't have 3g/2g if jio user move to such area where 4g ntwrk not supported ??

[@akgupta5350]

OOS

[@arindamsengupta9465]

You would be dropped. You can be in roaming mode if the Jio MME and other operator MSC have an interface validating and controlling roaming.

[@samanthgouru2407]

What is measurement report

[@TelecomTutorialinfo]

These are measurement of Signal Strength , Neighbors , Current Cell id Stats , and UE Side Radio information which are sent by UE towards Network . On basis of these parameters , EnodeB can take informed decision whether to trigger handover or Not ?

[@silot99]

v nicely explained