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Pat Dempsey Head of Strategic Services NUI Galway Email: pat.dempsey@nuigalway.ie Objectives of this session Understand how IP network design can impact the quality and reliability of VoIP services Understand the basic factors and design concepts for designing the IP network to support VoIP traffic Calculate typical bandwidth requirements on the users IP WAN based on voice services requirements What Tools are available to configure/troubleshoot Voice Over IP Is a Unique Application - Demands Intelligent Handling Delivering Quality of Experience A satisfactory level of perceived voice quality is achieved through the following: a properly-engineered network good network equipment and redundancy adequate bandwidth for peak usage use of QoS mechanisms ongoing monitoring and maintenance Design Recommendations for VoIP - typical The following slides are typical considerations when designing for VOIP Vendors only supports customers with Layer 2/3 switched networks (no shared media devices, cable-based, hub-based LAN) L2 switch ports must be set to autonegotiate for VoIP devices Goal of Zero Percent Packet Loss for VoIP Use G.711 CODEC when possible Excellent Voice Quality Bandwidth usually available in LAN and MAN Use G.729A or G.729AB to conserve bandwidth Take care to meet customer voice quality requirements Watch out for multiple transcodings (multiple VoIP hops) Be careful with VAD – subject to clipping effects Centralised voice mail and music can be a call quality issue Traffic engineering process - typical For site pairs, determine voice “trunks” needed Calculate VoIP bandwidth demands Traffic Bandwidth Calculator / Vivinet Assessor Overlay VoIP traffic patterns onto physical network diagram Vivinet Assessor Size the required primary and alternate converged network links: Evaluate current traffic demand Calculate, add in VoIP traffic demand Evaluate various failure scenarios Factor in desired headroom, unusable bandwidth Bandwidth Example Requirement: A com
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