Assessing network readiness for IP telephony

Bearden, Mark D.; Denby, Lorraine; Karaçali, B.; Meloche, J.; Stott, D.T.

doi:10.1109/icc.2002.997306

Cited by 20 publications

(19 citation statements)

References 8 publications

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“…A list of the available commercial tools that support VoIP is listed in [1,2]. For the most part, these tools use two common approaches in assessing the deployment of VoIP into the existing network.…”

Section: Introductionmentioning

confidence: 99%

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On the deployment of VoIP in Ethernet networks: methodology and case study

Salah

2006

Computer Communications

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Section: Introductionmentioning

confidence: 99%

“…Worst-case delay vs. number of VoIP calls 1. OPNET Modeler was provided under the OPNET University Programs.…”

mentioning

confidence: 99%

On the deployment of VoIP in Ethernet networks: methodology and case study

Salah

2006

Computer Communications

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“…Routing topology discovery uses a combination of techniques such as traceroute, ping, and routing table determination by SNMP polling 1 . More information about the routing topology discovery procedure is available in [9]. …”

Section: A Enterprise Network Studiedmentioning

confidence: 99%

QRPp1-3: Measurement of Path Redundancy for Protection in Enterprise Networks

Karaçali

Karol²,

Krishnan

et al. 2006

IEEE Globecom 2006

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Application-layer solutions to improve the reliability of realtime applications such as IP Telephony exploit the inherent redundancy in networks. Earlier work has shown that the ISP networks provide sufficient redundancy that can be used by such overlay solutions. Enterprise networks, on the other hand, are designed differently from ISP networks, and implementing an overlay on enterprise networks introduces additional constraints. In this paper, we explore the level of redundancy in enterprise networks that would justify an application-layer reliability solution, while taking into account the unique characteristics of enterprise deployments. We report the findings of an empirical study we conducted on nine real enterprise networks of varying sizes. Specifically, we quantify the amount of redundancy in enterprise networks and the protection level that can be achieved by single-hop versus multi-hop overlays. Our results indicate that, among the networks we considered, on average 30% and up to 86% of the nodes on end-to-end paths can be protected. Furthermore, in these networks going from a single-hop overlay to a multiple-hop overlay provided only marginal benefits.

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“…1 We have made the simulator publicly available to improve and ease the process of deploying VoIP for network designers and planners. The simulator's engine implements the analytical approach of throughput and delay analysis described in Section 2.…”

Section: The Gui-based Analytical Simulatormentioning

confidence: 99%

An analytical simulator for deploying IP telephony

et al. 2008

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Abstract. Deploying IP telephony or voice over IP (VoIP) is a major and challenging task. This paper describes an analytical design and planning simulator to assess the readiness of existing IP networks for the deployment of VoIP. The analytical simulator utilizes techniques used for network flows and queueing network analysis to compute two key performance bounds for VoIP: delay and bandwidth. The simulator is GUI-based and has an interface with drag-and-drop features to easily construct any generic network topology. The simulator has an engine that automates and implements the analytical techniques. The engine determines the number of VoIP calls that can be sustained by the constructed network while satisfying VoIP QoS requirements and leaving adequate capacity for future growth. As a case study, the paper illustrates how the simulator can be utilized to assess the readiness to deploy VoIP for a typical network of a small enterprise. We have made the analytical simulator publicly available in order to improve and ease the process of VoIP deployment.

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Assessing network readiness for IP telephony

Cited by 20 publications

References 8 publications

On the deployment of VoIP in Ethernet networks: methodology and case study

On the deployment of VoIP in Ethernet networks: methodology and case study

QRPp1-3: Measurement of Path Redundancy for Protection in Enterprise Networks

An analytical simulator for deploying IP telephony

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