The Cisco Enterprise Voice Over Data Design Exam qualifies candidates as having knowledge and skills in the technical issues surrounding the design of voice over data networks, explaining a methodology for approaching the problems faced by the Systems Engineer. It covers both IOS-based and CallManager-based voice network designs in depth, and the Cisco methodology for implementing voice over data networks.
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam.
Voice over Data Overview
Enterprise Network and Public Switched Telephone Network
- Describe the dual data infrastructure of an enterprise
- List the steps for planning an end-to-end IP telephony installation
- Describe route replacement as a common application for Voice over Data networking
- Describe the process for delivering a complete AVVID solution to a client
- Identify Characteristics of various Voice over Data technologies
Network Planning and Design
- List the deployment stages of Voice over Data solutions
- Describe the roles and responsibilities of the planning stage
- Describe the design stage and network assessment
- Identify pertinent voice traffic parameters and quantify capacity requirements
- Describe the importance of cost documentation in the network planning process
- Identify voice and data costs that should be documented
- List other important cost considerations
- Evaluate data and results to estimate potential savings for a customer
- Interpret output from the standard model
Standards for Voice over IP Signaling
H.323
- Describe the major differences between old (TDM) and new world (IP) signaling
- List the major new world (IP) protocols
- Identify the H.323 standard components
- Describe the function of each H.323 standard component
- Describe H.323 signaling protocols
- Describe call control signaling and setup
- Identify gateway control protocols
- Describe MGCP
- Describe SIP
Voice over Frame Relay Design Considerations
- Describe benefits of Voice over Frame Relay (VoFR)
- Identify common voice applications used over Frame Relay
- Describe VoFR encapsulation methods
- Describe the FRF.11 implementation agreement
- Identify Cisco VoFR connection types
- Describe design strategies for integrated multiservice network architecture
- Calculate VoFR bandwidth
CallManager Overview and Gateway Selection
CallManager Architecture
- Describe AVVID architecture and scalability
- Describe CallManager clusters
- Describe CallManager scalability
- Identify devices that can connect to a Cisco CallManager
- Describe intercluster communications and cluster-provisioning issues with isolated campus and multisite WAN deployment
- Describe DSP services functionality
- Describe call admission control functionality
- Describe methods for deploying CallManager
Gateway Types
- Identify H.323 gateway features
- Describe gateway functionality
- Identify VG200 and VG248gateway features
- Identify catalyst 6500 gateway features
- Identify catalyst 4000 gateway features
- Describe the features and functionality of IP Keyswitch and Survivable Remote Site Telephony
- Determine the proper gateway for a given network environment
Dial Plans and Voice Mail Considerations
Signaling, Networking, and Transporting
- Describe the difference between standard and nonstandard signaling
- Recognize PBX protocols that can be translated and those that need to be transported
- Describe networking PBXs over and IP network
- Describe methods for transporting PBX signaling across a WAN
- Define terminology used in calculating delay
Dial Plans
- Describe dial plan functionality and benefits
- Identify typical dial-plan tables and class of service groups
- Describe Cisco CallManager dial plan functionality
- Identify issues associated with a legacy to IP telephony migration
- Describe the history of basic and E911 services
- Identify the PBX and AVVID approaches to E911 support
- Describe a typical voice messaging system
- Describe the Cisco solution for integrating a legacy voice-mail system into a unified messaging system
Voice Over Data Characteristics
Delay Characteristics
- Identify the characteristics of Voice over Data
- Describe the causes of fixed delay
- Describe the causes of variable delay
- Calculate a delay budget
- Define terminology used in calculating delay
Compression Technologies and Packet Compensation
- Describe how Voice over Data products use CODECs
- Describe the Nyquist Theorem
- Describe the functions of hybrid coders
- Describe voice compression
- Describe the function of VAD
- Describe the cause and effect of packet loss
- Describe the cause of echo
- Describe Cisco Fax support of Fax Data
Quality of Service
Voice Quality Overview
- Identify network requirements to ensure voice quality
- Identify recommended QoS tools available to ensure voice quality in Voice over Data networks
- Identify prioritization tools
- Describe slow link efficiency tools
- Describe traffic shaping tools
- Identify the required steps for campus QoS
- Describe what happens inside a phone
- Describe admission control strategies
- Identify when to apply QoS tools on a campus
Comprehensive Design Strategies
- Identify legacy PBX and messaging features to be migrated
- Identify design requirements based on currently installed customer equipment
- Select a WAN topology for a Voice over Data network, given the characteristics of the existing network
- Select LAN components for a Voice over Data network, given the characteristics of the existing LAN infrastructure
- Identify the QoS tools to use in the Voice over Data network, given the WAN and LAN characteristics
- Identify the number of CallManager and UNITY servers to support a specified number of users
IP Telephony Design (IPTD) is the recommended training for this exam.
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