pdf_gross.gifH.248 / BICC in the Circuit Swiched Core Network - Trouble Shooting and Protocol Analysis

[3-day training course, Euro 3,450.- per participant]

backtotop.gifTraining Course Description

Course Description

  • This training course addresses the needs of engineers and technicians who are involved in the operation, optimization and troubleshooting to get familiar with 3GPP Rel. 4 circuit switched networks and above.
  • The combination of theoretical protocol knowledge and practical hands-on exercises will provide a thorough understanding for everyone who needs to tune circuit switched 3GPP networks.
  • The training course starts with an overview of the Mobile Network Architecture Evolution from 3GPP Rel.99 to Rel.4 and beyond with the particular focus on the CS-CN, the new interfaces Nc, Nb and Mc and the reasons for the introduction of split control and user plane entities.
  • We will introduce the operation of Soft Switches and the operation of Gateway Control entities and Media Gateways in both ATM and IP transport environments with practical exercises for the students to fully understand the differences and commonalities for these use cases.
  • The second part of the training course will explain the call setup protocols ISUP and BICC in very detail and will deepen that knowledge with practical analysis of log files and possible error cases using trace tools such as Wireshark.
  • Similarly, we will analyze the transport of higher layer CCS7 protocols over IP, known as SIGTRAN and review the major SIGTRAN protocol elements, their purpose and the functionality of that system in a circuit switched environment with gateway functionality towards IP infrastructures.
  • At the very heart of the training course, we will focus on H.248 / MEGACO protocol and analyze the allocation of contexts, creation, addition and movement of terminations, handling of codec’s and studying both message flow and data flow. We will review the RTP / SRTP / RTCP protocol family and discuss Nb Frame Part.
  • As an alternative and possible future migration of SIGTRAN we will then introduce the All-IP view with SIP / SDP as session control and IMS as new core network entity. SIP-I and SIP-T will be introduced for bridging IP networks for PSTN originated calls. The students will analyze the message flows in practical exercises and determine the differences to legacy call handling.
  • Finally, the students will analyze end to end call scenarios with PSTN originated calls to VoIP terminals and vice versa and experience the requirements for protocol translations in the Media Gateway Controllers and the provision of terminations in a Media Gateway.

Some of your questions that will be answered

  • What are the protocol stacks at the Nb and Nc interfaces and which are the possible optional implementations with 3GPP Rel4?
  • What is SIGTRAN, where and why is it used?
  • What is the detailed Message Structure of ISUP / BICC?
  • Where are the differences between ISUP and BICC?
  • How does Media Transport work and what are the message header details of RTP / RTCP?
  • What is H.248 / MEGACO and how does it work?
  • How does a Soft Switch work?
  • What are the new and modified network entities and how do they operate?
  • What are contexts, terminations and how are they controlled for the provisioning of media resources?
  • Is SIP / SDP an alternative and where and how?
  • How does the call setup work with SIP / SDP and how is the Media controlled using SDP?
  • What is SIP-I and SIP-T and where is it used?

backtotop.gifWho should attend this class?

  • The training course is particular useful to design engineers who engineers and technicians who are involved in the operation, optimization and troubleshooting of circuit switched networks.
  • Network operators and technical staff who need understand Soft Switches and their application in 3GPP networks.
  • Everybody who requires detailed knowledge about the protocols at the Nb, Nc and Mc interfaces.


  • The student should possess good knowledge of mobile technologies, such as GSM and / or UMTS and 3GPP Rel.99 architectures and network nodes. Experience in Rel.99 core network administration and optimization is advantageous.

backtotop.gifTraining Course Target

After the training course, the student will be able to ...

  • Troubleshoot the message flow between Gateway Controllers, Media Gateways and connected network entities.
  • Analyze and trace problems in both signaling and media flow in 3GPP Rel.4 based circuit switched networks.
  • Control and administrate possible migrations from ATM to IP based transport and related protocol changes in the higher signaling layers.

backtotop.gifTraining Course Duration

  • 3 days




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