IMS Identification and numbering


This section describes the identities, numbers and addresses used in IMS to identify: user, user equipment, network, network elements and services.


An IP Multimedia Services Identity Module (ISIM) is an application residing on the Universal Integrated Circuit Card (UICC) that provides access to IP Multimedia Services. ISIM contains parameters for identifying and authenticating the user to the IMS. The ISIM application can co-exist with (U)SIM and/or CSIM on the same UICC.


If you want to learn in depth IMS you can find on the following link: The Best IMS Training.

Categories: Telecommunication


Networking Fundamentals Training

Networking Fundamentals - Web Based Training

Have you ever wondered how networks work? How two computers communicate? How the Internet works? This course explains these concepts, starting with the basic building blocks of networks, and how Ethernet Local Area Networks (LANs) operate. We discuss IP addressing and subnetting, and how data gets routed from one LAN to another using various Wide Area Networking (WAN) technologies.

Categories: Networking



Overview of SCCP

The S7 consists of various functional elements where the Message Transfer Part (MTP) is the common platform. MTP serves different user parts, such as Telephony User Part (TUP), Integrated Services Digital Network User Part (ISUP), and other functional elements like Signaling Connection Control Part (SCCP).
SCCP provides additional functionality to fulfill the need for extended services in certain applications.
An example of an extended service is communication with the databases, Home Location Register (HLR) and Visitor Location Register (VLR), without any speech connection, e.g. communication during Location Updating.
The combination of the MTP and the SCCP is called the Network Service Part (NSP).
SCCP supports two network services:

  •  Connection Oriented (CO)
  •  ConnectionLess (CL)

Categories: Telecommunication


USSD Call Back


There are many ways to implement prepaid roaming. Currently, most of the prepaid roaming implementations utilize the capabilities provided by : 1 USSD (unstructured supplementary service data) 2 CAMEL (customized application mobile enhanced logic).

USSD Call Back:

USSD deploys a callback mechanism as you know, for each outgoing call initiated by a roamer, there will be two call legs—an international call leg back home and a follow-on call. That make call cost very high because it is surely not an efficient way to handle the call.
For that you can use USSD call Back service, but the user needs to initiate the service by using a special service code. However, implementing prepaid roaming with USSD is rather simple, fast, cheaper, and supported by almost all existing networks, providing a global footprint.

Categories: Telecommunication


CSFB and SMS over SGs

The CS FallBack (CSFB) in EPS enables the provisioning of voice and other CS-domain services (e.g. CS UDI video, LCS, USSD) by reuse of CS infrastructure when the UE is served by E-UTRAN. A CSFB enabled terminal, connected to E-UTRAN may use GERAN or UTRAN to connect to the CS-domain. This function is only available in case E-UTRAN coverage is overlapped by either GERAN coverage or UTRAN coverage.

Categories: Telecommunication


Learn Java

Learn Java

The Java Complete Learning CD Library is the comprehensive package of all Sun Java language training, comprised of nine (9) self-paced CD-ROM courses. This ultimate reference set covers all the technical training required to be able to implement most types of Java applications, whether they be standalone Java Standard Edition programs using GUI or browser-based technologies; or whether they are creating client-server Java Enterprise Edition programs.


A 9 CD online set of Sun MicroSystems JAVA Training Includes:

  • CDJ – 110A Fundamentals of the Java Programming Language
  • CDJ – 275A Java Programming Language
  • CDJ – 310 Java 2 Platform, Enterprise Edition J2EE Platform Overview for Managers
  • CDJ – 310A Developing Applications for the J2EE Platform
  • CDJ – 314A Web Component Development with Servlet and JSP Technologies
  • CDJ – 351A Advanced Business Component Development with Enterprise Javabeans Technology
  • CDJ – 450 Introduction to Mobile Java Technologies
  • CDJ – 455 Mobile Desktop Development with Java Technologies
  • CDJ – 460 J2ME and Mobile Phone Development Topics.

Categories: Java Programming



The MS normally operates on its home PLMN (HPLMN) or Equivalent Home PLMN (EHPLMN). However a visited PLMN (VPLMN) may be selected, e.g., if the MS loses coverage. There are two modes for PLMN selection:

  • Automatic mode - This mode utilizes a list of PLMNs in priority order. The highest priority PLMN which is available and allowable is selected.
  • Manual mode - Here the MS indicates to the user which PLMNs are available. Only when the user makes a manual selection does the MS try to obtain normal service on the VPLMN.

Categories: Telecommunication

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