Telco technical

& business courses

available worldwide

EPC, VoLTE Architecture & Signalling Protocols

core engineers
available worldwide
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Who Should Attend?

This course is intended for everyone who requires in-depth understanding of architecture and signalling procedures in the core part of EPS – especially network engineers responsible for network maintenance, troubleshooting, planning and commissioning.
Whether you already have an LTE network, you are getting ready to deploy it, or you are planning to implement VoLTE technology – this training is right for you!


Course Scope

  1. EPS Introduction.
    • 3GPP Core Network Evolution.
    • EPC Architecture.
    • Protocols in EPC – overview.
    • Roaming in LTE (conceptual view).
      • Home-routed traffic.
      • Local traffic breakout.
  2. Introduction to Voice over LTE Architecture.
    • Circuit Switched Fallback (CSFB).
    • IMS – based.
    • VoIP Over-the-top (OTT).
    • Road towards VoLTE – various deployment strategies.
  3. Signalling Protocols in EPC.
    • Overview of key EPC procedures.
      • Network Attachment and Detachment.
      • Tracking Area Update.
      • Service Request.
      • Dedicated Bearer Activation, Modification and Deactivation.
    • NAS protocol & procedures.
    • S1AP protocol & procedures.
    • GTP protocol & procedures.
    • S6a protocol & procedures.
    • [Optional] introduction to Diameter.
  4. CSFB. Technical Realisation.
    • SGsAP protocol and procedures.
  5. IMS, technical aspects.
    • IMS standardisation.
    • IMS architecture and functional elements.
    • IMS identities.
    • Charging aspects in IMS.
    • IMS interfaces and signalling protocols.
  6. [Optional] SIP Fundamentals.
    • SIP components (servers and clients) and their functions.
    • SIP servers: proxy (stateful and stateless), redirect, registrar.
    • SIP message structure.
    • SIP sessions: session setup, proxying and redirecting requests, address resolution..
    • SDP (Session Description Protocol).
    • General SIP message flow examples.
  7. [Optional] Policy and Charging Architecture.
    • Introduction to content-based charging and policy enforcement.
    • Online and offline charging.
    • PCC architecture.
    • Roaming aspects in PCC enforcement.
    • Gx, Gxx, Rx, Gy Diameter Applications and Procedures.

Course Objectives

The 4-5-day “EPC, VoLTE Architecture and Signalling Protocols” advanced course is focused on explaining how EPS network works and how it is integrated with previous-generation (2G/3G) networks and services. The training starts with an architecture introduction, including possible voice over LTE deployment strategies, followed by a general overview of all key signalling procedures and a detailed explanation of all key protocols in EPC network. Policy and Charging Architecture will also be discussed because of its great importance to IMS operation, especially in the context of mobile-based IMS deployments. Most protocols are illustrated with example traces captured in commercial networks. Practical issues related to testing and troubleshooting will be also discussed.



Participants should know architecture of mobile networks and have some knowledge about signalling protocols in telecommunication networks.


Training Structure

Four- or five-day (five including optional IMS part) training divided into logical sections. We recommend at least one additional day of workshop with our Expert to gain even more experience in network testing and troubleshooting.



Instructor-led training, illustration of real signalling traces.

I feel like the trainer is the best professor and mentor one can have.

Ms. Ledia Meici, AMC Albania

I am very impressed with the trainer's knowledge and experience.

Mr. Mouin Al Saghir, Vivacell

Very effective training methods.

Ms. Erjona Xhemali, AMC Albania

Really practical and very fruitful training.

Mr. Niroj Raya, NCell Nepal

Highly professional trainer with lots of practical experience. Friendly and open.

Ms. Olga Rudnicka, Tele2 Latvia

Trainers have passion to teach & impart knowledge.

Mr. Kanchan Chitrakar, Ncell Nepal

The trainer is capable of answering all my questions.

Ms. Ana Gheorghe, Vodafone RO

Excellent exercises!

Mr. Muhammad Ali, Mobilink Pakistan

Perfect course.

Mr. Arseniy Mazanik, Beeline Russia

Good logical structure of the course and explanation.

Ms. Elena Shevtsova, Beeline, KZ

Deep and detailed topic analysis.

Mr. Mohamed Sabry, Vodafone Egypt

This course will be very useful in my daily work.

Mr. Leopoldino Ferreira, Unitel Angola

More than excellent course!

Ms. Inessa Mijiferjyan, Vivacell

Very clear explanations.

Ms. Tatyana Krasyuk, Life Ukraine

The best training ever.

Mr. Timur Zagretdinov, MTT Russia

Course covers all important issues and presents relevant examples.

Mr. Mohamed Kamel, Vodafone Egypt

The course covers all the impacted areas.

Ms. Gratia Scanteie, Vodafone, RO

Training provides useful methods to analyze real protocols.

Mr. Seema Karn, NCell Nepal

Good direct connection between course material and real problems.

Mr. Alex Konstantopoulos, Cosmote, GR

Training was above expectations!

Mr. Ariel Haxhiu, Eagle Mobile, AL

A clear picture of GSM switching and signalling.

Ms. Anette Chale, mCel Mozambique

A lot of useful materials and knowledge.

Mr. Shukhrat Khaydar, UCell

Professional, high-quality trainer.

Mr. Gagik Shatveryan, Vivacell

Many different people from different operators can share their problems and ideas.

Mr. Omar El-Fiky, Vodafone Egypt

Trainer is open for comments and discussion.

Ms. Natalya Nerubenko, Life Ukraine

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

The course exceeded my expectations. Hats off!

Mr. Adnan Syed, Mobily

I received a lot of useful information which I use in my work every day.

Ms. Viktoriya Gusarova, Beeline RU

The whole course was very valuable.

Mr. Sayyid Ali, Dhiraagu Maldives

I can proudly recommend these courses for others as well.

Mr. Tarvo Jammer, Elisa Estonia

Excellent knowledge from the trainer.

Ms. Catherine Barman, Swisscom

Overwhelming knowledge and expertise. Interactive and enjoyable learning.

Mr. Ashish Shrestha, NCell Nepal

Everyone gets individual attention from the trainer.

Ms. Inga Tomsone, Tele2 Latvia

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

Excellent, knowledgeable trainer, open to communication.

Mr. Dmitrii Kropotov, Tele2 Russia

Unique training covering the most important areas of my work.

Mr. Eldar Mursaqulov, Azercell

The training exceeded my expectations.

Ms. Irida Gjashta, AMC Albania

Excellent course and instructor.

Mr. Nikolay Suetin, Beeline Russia

Experienced trainer. Excellent descriptions.

Mr. Ahmad Doar, Mobily, KSA

A good approach to a complex problem.

Ms. Horia Catrinoiu, Vodafone RO

Experienced trainer. Real cases with references to recommendations.

Mr. David Curkan, T-Mobile Croatia

Amazing, more than excellent, audience-oriented trainer.

Mr. Evgeniy Dmitriev, Astelit Ukraine

The training is completely excellent.

Mr. Philipp Korostelev, Beeline Moscow

Seminar entirely for Telecommunication operators. A lot of issues covered.

Ms. Pinelopi Tragoudara, Vodafone GR

Good class notes and great examples.

Mr. Ghaffar Masood, Mobilink Pakistan

Regardless of technology I received theoretical and practical answers.

Mr. Kosta Pribić, T-Mobile Croatia

Great teacher with deep knowledge and experience.

Mr. Philippe Wrzecionek, TATA

Trainer adapted to the expectations of the audience.

Mr. Antoine Blanchet, Monaco Telecom

Excellent methodology of teaching. Simple and easy to understand training.

Mr. Arben Shabani, PTK Kosovo

Very well organized training programmes.

Mr. Mihnea Teodorescu, Cosmote, RO

Trainer was able to answer practical questions.