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Voice over Internet protocol (VoIP) quality monitoring platforms need to be as simple as possible, especially at low capacity end-points, such as smart phones. The existing simple packet loss-based quality model, with only the input metric of the packet loss parameter, needs to be enhanced to increase the accuracy of quality prediction while ensuring that implementation is simple. Several burstiness...
This paper has designed a cross-layer framework for voice over Internet protocol (VoIP) services in IEEE 802.16 systems. It uses the application session information of the session description protocol to generate the quality of service parameters in IEEE 802.16 systems. This feature allows the system to efficiently allocate the radio resource because it can exactly estimate the properties of VoIP...
Integrating voice / video communication into business processes can accelerate resolution time, reduce mistakes, and establish a full audit-trail of the interactions. Some VoIP service providers offer website based or plugin based solutions, which are, however, difficult to integrate with other applications. A promising approach to overcome these disadvantages is the development of appropriate Web...
In recent years the Department of Defense has aggressively invested in development of an Internet Protocol (IP) based network that interconnects mobile air platforms and ultimately will also connect to the Global Information Grid (GIG) as part of its Net-Centric Warfare initiatives. One of the major visions for the IP based networks is to support interoperable voice communication amongst heterogeneous...
This work gives an overview of SIP-Trunking solution and explains the existing difficulties in implementing VoIP services, when this architecture is deployed in multivendor environment. The causes of these problems are explained with two existing approaches used by carrier to solve interoperability: they are Full Jacket SIP-Trunk and Customized SIP-Trunk. A solution to cover the lackings of SIP standards...
Whilst SAML-based federations are most often used by academic and semi-commercial institutions that focus only on attribute-based authentication, we foresee a growing interest for service providers providing charged services. Since more and more academic and semi-commercial federation participants offer Voice-over-IP (VoIP) services, this type of service provides an entry point into identity federation...
The next-generation backbone routers need large-bandwidth communication capability because of increased future Voice over Internet Protocol (VoIP) services. Providing these or other future ubiquitous services will require new Network Processor (NP) designs, since these protocols or services are expected to require enormous increases in processing power in order to address their fine-grain communication...
The dominance of multimedia applications has increased with the emergence of high speed data networks. Among the multimedia applications, VoIP has placed itself in a strong position. However, the market is dominated by a number of VoIP applications with different architectural and protocol layouts. Therefore, analysis and comparison is necessary to understand their behavior and to define the QoS of...
Voice over Internet protocol (VoIP) is a prevalent multimedia application nowadays. For mobile nodes (MNs) using VoIP services in wireless networks, the handoff issues need to be taken into account. Stream control transmission protocol (SCTP) is a potential transport layer protocol with multi-homing and multi-streaming functions. Mobile SCTP with dynamic address reconfiguration (DAR) extends SCTP...
The market growth of VoIP infrastructures and services is pushing towards additional facilities to enrich service offer in an open way, thus representing also a differentiating aspect and a competitive advantage for service providers. We claim that the proactive provisioning of estimations about runtime VoIP quality is a crucial facility still missing in VoIP services. For instance, such a facility...
It is well known that no security mechanism can provide full protection against a potential attack. There is always a possibility that a security incident may happen, mainly as a result of a new or modified attack that the employed countermeasures cannot handle or identify. It is therefore useful to perform a deferred analysis of logged network data, in an attempt to identify abnormal behavior/traffic...
This paper evaluates the performance of VoIP services over mobile accesses, with special focus on currently deployed Best Effort UMTS networks. There are different configuration parameters that have a great impact on end users' perception of quality. This paper tries to help understanding the impact of those parameters, and how they can be tuned for a better VoIP experience.
This demonstration presents spam scenarios and a lightweight security mechanism for protecting spam calls in SIP- based VoIP services. Generally, VoIP providers have been applying only the HTTP digest scheme to authenticate a UA. They may be not consider protecting SIP signaling between the light-weight UA and the SIP proxy using the TLS mechanism since it suffers from the heavy overhead for computation...
Service migration enables continuity of service experiences while changing devices, without terminating or disturbing the running sessions of the service. It has been proposed as an important application for emerging ubiquitous computing environments. This paper specifically studies service migration for voice over IP (VoIP) services by applying session initiation protocol (SIP) as the main method...
VoIP services have become a major competitor to the PSTN networks and will replace them in the near future. Based on this fact the SIP protocol became very popular. But handling tens of thousand of clients, despite the network and application delays is a challenging task. The SIP proxy servers need to be implemented very efficiently to reduce the application delays. This work evaluates and compares...
An essential feature of new generation networks is the availability of many new services offered by several different players. Often, in this scenario, different applications and services have their own authentication method and use different credentials. More reliable, flexible and easy-to-use methods are needed. We separate the recovery of application-specific credentials, hosted in the network,...
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