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CS Core Secrets: Mastering 2G, 3G Voice Networks
Rating: 4.0 out of 5(129 ratings)
452 students

CS Core Secrets: Mastering 2G, 3G Voice Networks

Unlock the full potential of CS Core with practical insights into architecture, protocols, and call flows for real-world
Created byCore & IMS Learning
Last updated 1/2026
English

What you'll learn

  • Understand basics of CS & CSFB Core Networks
  • Student will advance in his Voice core Career track
  • Real-world skills required for job in any telecom operator or vendor company
  • Architecture of CS & CSFB Core Networks
  • Call flows & Different Procedures in CS & CSFB Mobile Core networks
  • Mobile & Network Identifiers

Course content

1 section • 36 lectures • 5h 33m total length

  • 1.1 CS Core Introduction6:20
  • 1.2 What is the integrated Core Network in 2G, 3G & 4G Network ?14:45

    Explore how 2G/3G core networks use circuit switching and packet switching, with NSC and edge (home location register), and contrast 4G's evolved packet core and IMS-based voice options.

  • 1.3 Difference Between Horizontal & Vertical Core Networks18:22
  • 1.4 High Level view about CS Core Nodes, & used Protocols7:12
  • 1.5 Split Architecture From MSC to MSC-S and MGW7:20

    Explain the split architecture in 3G networks by separating signaling to an MSC-S and traffic to a media gateway, contrasting with legacy MSC/NSC monolithic setups.

  • 1.6 Access/Radio RF Network Structure27:19
  • 1.7 MSCS | Mobile Switching Center Server22:20
  • 1.8 MGW | Media Gateway8:43
  • 1.9 HLR | Home Location Register3:30
  • 1.10 SMSC | SMS Server4:44
  • 1.11 EIR | Equipment Identity Register2:25
  • 1.12 What is the CS Core Network Identities ?2:33

    Explore how the IMSI, a unique SIM identifier, divides into MCC, MNC, and MSIN to form the PLMN address.

  • 1.13 IMSI & MSISDN | Mobile Station ISDN Number0:47
  • 1.14 IMEI & IMEI SV | International Mobile equipment Identity1:27

    Understand IMEI and IMEI SV identities to verify device status, blacklisted, whitelisted, stolen, or valid, and identify software versions like iOS 13.2 for carrier connectivity.

  • 1.15 IMEI check call flow3:21
  • 1.16 TMSI | Temporary Mobile Subscriber Identity2:55
  • 1.17 MGT | Mobile Global Title2:05
  • 1.18 MSRN | Mobile Station Roaming Number3:13
  • 1.19 Location Identities in CS Core5:28
  • 1.20 Basic Procedures in CS Circuit Switching Core Network4:25

    Master basic procedures in cs core networks for a mobile connecting to a network. The lecture details attach, authentication, device identity checks, location update, and registration within the network.

  • 1.21 IMSI Attach Signaling Procedures5:41
  • 1.22 Authentication Procedures26:52

    Explain how networks authenticate users using IMSI, secret keys, and A3/A8 algorithms to generate triplets (RAND, SRES, KC) and verify via MSC, HLR, and authentication center.

  • 1.23 Ciphering Procedures6:15
  • 1.24 Purge MS2:09
  • 1.25 What is meant by Location update & what is its types ?6:02

    Explain how a subscriber triggers location updates when moving between location areas or nfc areas, and outline normal, periodic, nz touch, detach, combined, independent, and roaming updates.

  • 1.26 Normal Location Update Procedures9:46
  • 1.27 IMSI Attach Signaling Procedures1:10
  • 1.28 IMSI Detach Signaling Procedures1:18

    Describe the IMSI detach signaling process where a switched-off mobile sends an SMS to the network, prompting the MSC to mark the subscriber as detached.

  • 1.29 Periodic Location update Procedures2:06
  • 1.30 Combined Attach Procedures1:49
  • 1.31 Independent Location update1:29
  • 1.32 Data Recovery Location Update1:50
  • 1.33 Location Update while Roaming2:49
  • 1.34 Call Flow MO/MT Signaling Procedures1:04:41
  • 1.35 SMS call flow15:59
  • 1.36 MSC in Pool34:06

Requirements

  • No pre-Knowledge is required, you will learn everything about Voice core networks from A to Z
  • Laptop & Internet connection
  • Be ready to learn
  • No software is required

Description

Unlock the Power of CS Core Networks: Your Gateway to Telecom Expertise
Dive into the world of CS Core with this comprehensive course designed to make you a master of 2G, 3G voice networks. Whether you're a telecom professional, an engineer, or simply passionate about the field, this course will equip you with in-depth knowledge of CS Core architecture, protocols, signaling, and procedures.

What You’ll Learn:


  • CS Core Fundamentals: Understand the integrated network in 2G, 3G, and 4G.

  • Architectural Insights: Explore the evolution from horizontal to vertical networks and split architectures.

  • Key Nodes & Protocols: Gain mastery of MSC, MGW, HLR, SMSC, and their protocols.

  • Network Identities: Decode IMSI, MSISDN, IMEI, TMSI, and more.

  • Call Flows & Signaling: Master MO/MT call flows, SMS flows, and location updates.

  • Procedures in Action: Learn authentication, ciphering, and roaming updates step-by-step.


Why This Course?

This course combines theoretical clarity with practical insights. You’ll not only learn how CS Core works but also understand its real-world applications in modern telecom systems. With detailed call flow diagrams, real-world examples, and simplified explanations, this course bridges the gap between theory and practice.


Course Duration

This course is around 6 Hours duration.


Mobile CS Voice Core Concepts in 2G GSM, 3G UMTS & 4G-LTE (CSFB)

1.1 CS Core Introduction

1.2 What is the integrated Core Network in 2G, 3G & 4G Network ?

1.3 Difference Between Horizontal & Vertical Core Networks

1.4 High Level view about CS Core Nodes, & used Protocols

1.5 Split Architecture From MSC to MSC-S and MGW

1.6 Access/Radio RF Network Structure

1.7 MSCS | Mobile Switching Center Server

1.8 MGW | Media Gateway

1.9 HLR | Home Location Register

1.10 SMSC | SMS Server

1.11 EIR | Equipment Identity Register

1.12 What is the CS Core Network Identities ?

1.13 IMSI & MSISDN | Mobile Station ISDN Number

1.14 IMEI & IMEI SV | International Mobile equipment Identity

1.15 IMEI check call flow

1.16 TMSI | Temporary Mobile Subscriber Identity

1.17 MGT | Mobile Global Title

1.18 MSRN | Mobile Station Roaming Number

1.19 Location Identities in CS Core

1.20 Basic Procedures in CS Circuit Switching Core Network

1.21 IMSI Attach Signaling Procedures

1.22 Authentication Procedures

1.23 Ciphering Procedures

1.24 Purge MS

1.25 What is meant by Location update & what is its types ?

1.26 Normal Location Update Procedures

1.27 IMSI Attach Signaling Procedures

1.28 IMSI Detach Signaling Procedures

1.29 Periodic Location update Procedures

1.30 Combined Attach Procedures

1.31 Independent Location update

1.32 Data Recovery Location Update

1.33 Location Update while Roaming

1.34 Call Flow MO/MT Signaling Procedures

1.35 SMS call flow

1.36 MSC in Pool



Who Should Enroll?

  • Telecom engineers aiming to enhance their CS Core knowledge.

  • Students or graduates seeking a career in telecom networks.

  • Professionals transitioning to voice core technologies.

By the end of this course, you’ll be fully equipped to work confidently in telecom CS Core environments and make a tangible impact in your career. Join now and start your journey to mastering voice networks!


Who this course is for:

  • Complete beginners who want to learn about mobile Core Networks
  • Students with some knowledge about telecommunications, who want to explore further
  • IT Professionals who want to learn about Core Networks
  • Diploma holders who want to learn about Core Networks

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