Juergen Quittek

On Spam over Internet Telephony (SPIT) Prevention

Spam over IP telephony (SPIT) is expected to become a serious problem in the near future. One of the main requirements for a SPIT prevention system is to avoid the involvement of the callee in the SPIT detection process, because this implies disturbing the callee each time an unclassified potential SPIT call arrives. Further requirements include adaptability to different deployment scenarios and flexibility to quickly react to new kinds of SPIT that bypass existing prevention systems. This article analyzes the requirements for SPIT prevention, provides a systematic classification of currently known SPIT prevention methods, and introduces a reference model for SPIT prevention systems. As an instance of the reference model, we designed and implemented an advanced SPIT prevention system, composed of methods that avoid unnecessary callee interaction and adaptive in order to be customized for different scenarios.

Latest trends in telecommunication standards

Standardization organizations play a major role in the telecommunications industry to guarantee interoperability between vendors and allow for a common ground where all players can voice their opinion regarding the direction the industry should follow. In this paper we review the current activities in some of the most relevant standardization bodies in the area of communication networks: 3GPP, IEEE 802.11, BBF, IETF, ONF, ETSI ISG NFV, oneM2M and ETSI TC ITS. Major innovations being developed in these bodies are summarized describing the most disruptive directions taken and expected to have a remarkable impact in future networks. Finally, some trends common among different bodies are identified covering different dimensions: i) core technology enhancements, ii) inter-organizations cooperation for convergence, iii) consideration of raising disruptive technical concepts, and iv) expanding into emerging use cases aiming at an increase of future market size.

Scalable fault management for mobile networks beyond 3G

The development of future releases of third generation and fourth generation cellular network shows a clear indications that todays ATM-based radio access network (RAN) was replaced by an IP-based RAN particularly for reducing the cost compared to todays RANs. Managing an IP-based RAN with SNMP is a challenge, particularly concerning scalability. Already existing solutions for delegating management functions to managed nodes can achieve the required scalability, but they come with a big overhead of resource consumption and complexity. This paper presents a lean solution for health checking of managed nodes that achieves this goal by restricting itself to this purpose. The CHECK MIB module serves for remote configuration of heath check actions to be performed at a managed node and for retrieving health check results. Resource consumption is very low compared to already existing, more general technologies. Health checks can be specified easily by setting a very small number of objects and the implementation of the MIB module is lightweight.