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Taiwan has recently opened the business of telephony services from IP network call to PSTN (IP2PSTN). However, due to the use of existing E.164 remote authentication code cannot be effectively confirmed the true identity of the IP caller, giving rise to a serious telephony supervision loopholes, and making the callee of PSTN involved in a lot of phone fraud attacks. In this study, an access authorization...
Network operators are in the process of adopting the IP Multimedia Subsystem (IMS) as their main underlying infrastructure which will in turn be used as a Service Delivery Platform (SDP). This process requires the migration of current services to their IMS counterparts, as well as a compatibility layer enabling successfull communication between IMS and other network infrastructures. Any and all functionality...
In general, the Stream Control Transmission Protocol (SCTP) delays the sending of acknowledgments. For specific cases, this results in non-optimal protocol behavior. Therefore, the protocol specification defines several exceptions that allow the receiver of an SCTP packet containing user data to send the corresponding acknowledgment without delaying it. However, all these exceptions only take the...
This paper focuses on the transmission of real-time fax in IP networks. Itpsilas been some time now that expressions like ldquoVoice over IPrdquo, ldquoFax over IPrdquo and the likes are heard extensively in the telecommunications industry. The idea is utilizing data networks to deliver telecommunications services which are presently provided by the PSTN. The incentive is pretty straightforward: cutting...
The crucial challenge that communications industry has been wrestling with is the issue of how the underlying technologies should evolve and be used to help service providers remain competitive in an environment that for many years has been marked by increased rivalry and deregulation. Next Generation Network with its decomposed architecture addresses this challenge by taking full advantage of sophisticated...
A method of admission control based on both resource requests by applications and class-based traffic measurement results was developed. In this method, a wide range of admission-control policy can be realized by adjusting three parameters, alpha, beta, and gamma. A policy-server prototype using this method and simulated voice traffic was used in traffic measurements. The measurements results show...
The Next-Generation Network (NGN) is currently under development. Supporting 3rd party SIP applications on NGNs is necessary in order to improve the services provided to NGN subscribers. We propose using certain function in order to fully open up NGN and allow 3rd party service providers to offer services running on SIP application servers. If the deployment objectives of our proposed functions are...
In this paper, we present a test methodology for PSTN emulation and simulation services in order to test capabilities and features of next generation networks (NGN) elements. The main purpose of these tests is evaluation of vendorspsila equipment in single and multi-vendor environments in conjunction with the legacy PSTN network. The methodology consists of some categories each of which includes some...
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