Telco technical

& business courses

available worldwide

Roaming in Mobile Networks

roaming engineers
available worldwide
available online
Ask for offer

Who Should Attend?

The course is designed for employees of mobile network operators, who need to understand the principles of roaming signalling in mobile networks.


Course Scope

  1. Overview of Network
    • Network Organisation.
    • 2G/3G End User Main Identities.
    • GERAN Nodes.
    • UTRAN Nodes.
    • Common Databases.
    • 2G Circuit-switched Service – Roaming Architecture.
    • 3G Circuit-switched Service – Roaming Architecture.
    • Packet Switched service – Roaming Architecture.
    • Evolved Packet Core – Roaming Architecture.
    • IMS Architecture.
    • IMS – Interworking.
  2. Overview of Procedures.
    • GSM CS Registration.
    • GPRS Attach.
    • Call Setup (Monolithic MSC). 
    • Call Setup (Split Architecture).
    • PDP Context Activation.
    • Voice over LTE (VoLTE) Call Setup.
    • Short Message Service (SMS).
    • International Roaming.
    • Call Forwarding.
  3. IP-based Signalling Protocols.
    • Access Point Name (APN).
    • GPRS domain - .gprs
    • GPRS Roaming eXchange (GRX).
    • Session Management.
    • Secondary Packet Data Protocol (PDP) Context.
    • QoS in PS Service.
    • User IP Address Assignment.
    • IMS Session With Policy Control.
  4. DIAMETER Base Protocol.
    • 3GPP DIAMETER Applications. 
    • PCRF Application.
    • PCRF Application - Roaming.
  5. Session Initiation Protocol (SIP).
    • Session Description Protocol Basics.
    • SIP Multimedia Session Set-up.
    • P-CSCF Discovery.
  6. Signalling System 7 (SS7) Principles and Signalling Connection Control Part (SCCP).
    • SS7 Protocol Stack.
    • SS7 Key Concepts.
    • SCCP Basics and Routing.
    • SCCP Functional Structure.
    • SCCP Connection-oriented Service. 
    • SCCP Message Parameters.
    • SCCP Address Component.
    • Global Title Translation (GTT) - Routing. 
    • SCCP Connectionless Service.
    • SCCP Examples.
  7. SS7 Mobile Services.
    • Transaction Capabilities Application Part (TCAP).
    • TCAP Structure.
    • TCAP Messages and Information Elements (IE’s).
    • TCAP Information Element and Tag.
    • TCAP Messages.
    • Mobile Application Part (MAP).
    • MAP – Context and Coding.
    • General Mobile Application Part (MAP) Structure.
    • MAP Examples: Location Updating.
  8. SS7 Call and Media Gateway Control.
  9. Call and Bearer Control Protocols.
    • Integrated Services Digital Network (ISDN) User Part.
    • ISUP Messages.
    • Session Initiation Protocol (SIP).
    • ISUP-SIP Interworking: SIP-I.
    • SIP-I Example.
    • ISUP over SIP: Session Initiation Protocol for Telephony (SIP-T).
    • Bearer Independent Call Control (BICC).
    • BICC Serving Node.
    • BICC Features and IE’s.
    • BICC Call Setup (part).
    • H.248/MEGACO Introduction.
    • Media Gateway Connection Model.
  10. SS7 Transport.
    • Classical and Broadband Transport. 
    • Layered structure of Message Transfer Part (MTP).
    • MTP Layer 3 Functions.
    • MTP L3 – Routing Labels.
    • MTPL3 – Routing Tables.
    • MTPL3 – International Signalling Aspects.
    • Signalling Transport over IP (SIGTRAN).
    • Basic Terms.
    • SIGTRAN – Support for International Signalling.
  11. Charging in Roaming.
    • Charging Principles.
    • Standard CRD Formats.
    • CS CDR – Selected Features.
    • PS CDR – Selected Features.
    • Transferred Account Procedure: TAP-in and TAP-out.

Course Objectives

The course is designed for employees of mobile network operators, who need to understand the principles of roaming signalling in mobile networks.



Participants should have a basic understanding of mobile network architecture and its services.


Training Structure

Three-day training divided into logical sessions.



Instructor-led training. Exercises and trace analysis.

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

Perfect course.

Mr. Arseniy Mazanik, Beeline Russia

Great teacher with deep knowledge and experience.

Mr. Philippe Wrzecionek, TATA

Excellent exercises!

Mr. Muhammad Ali, Mobilink Pakistan

The course exceeded my expectations. Hats off!

Mr. Adnan Syed, Mobily

I can proudly recommend these courses for others as well.

Mr. Tarvo Jammer, Elisa Estonia

The training is completely excellent.

Mr. Philipp Korostelev, Beeline Moscow

The best training ever.

Mr. Timur Zagretdinov, MTT Russia

A clear picture of GSM switching and signalling.

Ms. Anette Chale, mCel Mozambique

Very well organized training programmes.

Mr. Mihnea Teodorescu, Cosmote, RO

Really practical and very fruitful training.

Mr. Niroj Raya, NCell Nepal

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

Ms. Pinelopi Tragoudara, Vodafone GR

More than excellent course!

Ms. Inessa Mijiferjyan, Vivacell

Overwhelming knowledge and expertise. Interactive and enjoyable learning.

Mr. Ashish Shrestha, NCell Nepal

Experienced trainer. Real cases with references to recommendations.

Mr. David Curkan, T-Mobile Croatia

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

Ms. Viktoriya Gusarova, Beeline RU

The training exceeded my expectations.

Ms. Irida Gjashta, AMC Albania

Very effective training methods.

Ms. Erjona Xhemali, AMC Albania

Training was above expectations!

Mr. Ariel Haxhiu, Eagle Mobile, AL

A good approach to a complex problem.

Ms. Horia Catrinoiu, Vodafone RO

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

Mr. Arben Shabani, PTK Kosovo

Excellent knowledge from the trainer.

Ms. Catherine Barman, Swisscom

A lot of useful materials and knowledge.

Mr. Shukhrat Khaydar, UCell

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

Ms. Olga Rudnicka, Tele2 Latvia

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

Mr. Mouin Al Saghir, Vivacell

Deep and detailed topic analysis.

Mr. Mohamed Sabry, Vodafone Egypt

The whole course was very valuable.

Mr. Sayyid Ali, Dhiraagu Maldives

Unique training covering the most important areas of my work.

Mr. Eldar Mursaqulov, Azercell

Trainers have passion to teach & impart knowledge.

Mr. Kanchan Chitrakar, Ncell Nepal

Training provides useful methods to analyze real protocols.

Mr. Seema Karn, NCell Nepal

Good logical structure of the course and explanation.

Ms. Elena Shevtsova, Beeline, KZ

Trainer was able to answer practical questions.

Mr. Daniel Krolikowski, Play Poland

Regardless of technology I received theoretical and practical answers.

Mr. Kosta Pribić, T-Mobile Croatia

Course covers all important issues and presents relevant examples.

Mr. Mohamed Kamel, Vodafone Egypt

Excellent, knowledgeable trainer, open to communication.

Mr. Dmitrii Kropotov, Tele2 Russia

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

The course covers all the impacted areas.

Ms. Gratia Scanteie, Vodafone, RO

Trainer is open for comments and discussion.

Ms. Natalya Nerubenko, Life Ukraine

Professional, high-quality trainer.

Mr. Gagik Shatveryan, Vivacell

The trainer is capable of answering all my questions.

Ms. Ana Gheorghe, Vodafone RO

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

Ms. Ledia Meici, AMC Albania

Very clear explanations.

Ms. Tatyana Krasyuk, Life Ukraine

Trainer adapted to the expectations of the audience.

Mr. Antoine Blanchet, Monaco Telecom

Good direct connection between course material and real problems.

Mr. Alex Konstantopoulos, Cosmote, GR

Amazing, more than excellent, audience-oriented trainer.

Mr. Evgeniy Dmitriev, Astelit Ukraine

Good class notes and great examples.

Mr. Ghaffar Masood, Mobilink Pakistan

This course will be very useful in my daily work.

Mr. Leopoldino Ferreira, Unitel Angola

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

Mr. Omar El-Fiky, Vodafone Egypt

Excellent course and instructor.

Mr. Nikolay Suetin, Beeline Russia

Everyone gets individual attention from the trainer.

Ms. Inga Tomsone, Tele2 Latvia

Experienced trainer. Excellent descriptions.