Advanced: Voice in 4G: CSFB, VoIP & VoLTE

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A look at different approaches to voice in 4G LTE Mobile Cellular Technology.

All our slides and videos are available at:
  1. 3G4G
  2. 4G
  3. LTE
  4. Voice and SMS
  5. CSFB
  6. Circuit Switched Fallback
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Advanced: Voice in 0:28:10

Advanced: Voice in 4G: CSFB, VoIP & VoLTE

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CSFB : LTE EPC co-existence with 2G/3G CS Core for voice service

8. VoLTE Evolution 0:31:02

8. VoLTE Evolution ( Including CSFB , SMS over SGs Flows , VoLTE Flows )

Circuit Switched Fallback 0:07:22

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CSFB - Theory 0:17:44

CSFB - Theory + Log Analysis

Circuit Switch Fall 0:03:46

Circuit Switch Fall Back - CSFB

CSFB in 30 0:01:03

CSFB in 30 seconds

4G/5G Web Series 1:00:00

4G/5G Web Series - Lecture#1: LTE Voice Service - CS Fall Back

5. SRVCC (Single 0:28:14

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

Technical Telecom Interview 0:11:19

Technical Telecom Interview Questions - Session 3 - VoLTE, CSFB, SRVCC

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4g/lte CSFB part-1,niladri nihar nanda

Voice Service Alternatives 0:16:35

Voice Service Alternatives for LTE Networks

CSFB Call Flow 0:15:36

CSFB Call Flow (4G-LTE to 3G circuit switched fallback ) by TELCOMA Global

LTE Voice Alternatives 0:01:19

LTE Voice Alternatives

CSFB (Circuit Switch 0:14:13

CSFB (Circuit Switch Fall Back) and Logs Overview #LTE || techlteworld (TLW)

Circuit Switched Fallback 0:16:26

Circuit Switched Fallback - CS Fallback - CSFB - Explained in LTE 4G Networks

LTE Discussion on 0:04:59

LTE Discussion on CSFB (Circuit Switched Fallback)

CSFB Circuit Switching 0:17:31

CSFB Circuit Switching Fallback from 4G LTE | Principles, Attach & Call flow Procedures | Arabic

1. VoLTE Overview 0:15:54

1. VoLTE Overview (Voice over LTE) - VoLTE Introduction - What is VoLTE - VoLTE Explained

LTE CSFB (Circuit 0:03:23

LTE CSFB (Circuit Switched Fallback) | LTE Learning

Unlocking LTE Network 0:45:00

Unlocking LTE Network Secrets: What Does CSFB Log Analysis Reveal?

MO CSFB to 0:09:56

MO CSFB to UMTS network during Connected mode[LTE]: CSFB Call flow

Комментарии
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very good training brother and very useful.. I really appreciate your presentation skills

kavya-
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Really man. you did great job by putting information so simply.

saj
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Thank you so much! Been watching your videos on repeat for the last week now! Also this idea that 4G didn't have the "voice part" now makes so much sense, when I used to make calls and I have attached to the LTE 4G network, the service would drop from "4G" and switch to HSPA+ or something lower. Now I know why!

My question is, that at 10:00 you mention how CDMA and GSM each had their own methods of dealing with the CSFB. But is it fair to say that CDMA was always less popular and supported than GSM? If so, why did the SVLTE for CDMA do better than the SGLTE? Plus, CDMA had the advantage of SRLTE...So why was CDMA so much less popular than GSM?

horizonbrave
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Hey 3G4G, Anotherquestion, in my daily work, I noticed that some call traces in Wireshark show "SRVCC". I looked it up and it means "Single Radio Voice Call Continuity". Reading a little about it, is this the same as CSFB (call fall back) ?

horizonbrave
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Hmm... so at 22:40, you say that 4G VoLTE, it uses Voice as data...and it has it's own separate signaling to the IMS core. So just to make this clear if the Voice (in red on the slide) were being sent over the default data bearer (in gold on the slide), then that is the method for OTT clients like Skype and Viber? BUT because the voice now has a separate 3rd bearer, than that is what makes it VoLTE? Does the signaling method remain the same for OTT usage like Skype and Viber, and with VoLTE calls?

horizonbrave
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Great work. Really worth watching it .

vigneshvicky