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Elements and Performance Criteria

1. Plan and design VoIP infrastructure to meet business requirements
   • Ascertain end-user requirements in consultation with client
   • Select VoIP infrastructure in line with business and end-user requirements, within budget limitations
   • Select protocols for converged networks
   • Select hardware, software, network and security requirements according to agreed business and end-user specifications
   • Investigate factors affecting bandwidth and calculate bandwidth usage for various codecs, including considerations of overhead, connection quality and connection speeds
2. Install and configure VoIP infrastructure to meet business requirements
   • Implement telephone number mapping (ENUM), number portability, end-point addressing, path selection, calling classes and overlapping number ranges
   • Install, configure and test gatekeepers
   • Install and test convergent terminal equipment and software
   • Install software, and configure and test VoIP services
   • Configure security access levels to safeguard data, making use of appropriate tools
3. Configure UC network
   • Obtain topology and components of UC network
   • Analyse potential of IP multimedia subsystem (IMS) network architecture to enable convergence of voice, video and data applications and various mobile network technologies over IP based layer
   • Incorporate use of a communications server to provide real-time multimedia communications
   • Select common video conferencing codecs according to standards and practices
   • Select voice and video conferencing hardware
   • Implement IP-private branch exchange (PBX) functionalities in the UC network
4. Test and evaluate performance of convergent networks
   • Develop possible network congestion solutions for common network congestions to meet the specified quality of service (QoS)
   • Provide solutions for problems with contacting emergency services
   • Analyse network traffic and resolve problems using packet sniffer, monitoring software and hardware solutions
   • Troubleshoot convergent communications over wireless networks
   • Analyse types and effects of attacks, including man-in-the- middle attacks
   • Plan ways to counteract denial of service (DoS) and distributed DoS (DDoS) attacks
   • Predict the impact of virtual local area network (VLAN) hopping, media access control (MAC) address movements, additions and changes on network
5. Test and verify security access levels
   • Analyse types of intrusion detection
   • Monitor and evaluate capability and reliability of security systems
   • Make system alterations to ensure protection against known and potential threats
   • Verify and test user settings conform to security policies
   • Back-up, upgrade and scan systems to minimise attacks
6. Complete documentation and sign-off procedures
   • Complete required records and notify client
   • Remove installation waste and debris from worksite and dispose of according to environmental requirements to maintain safe worksite conditions
   • Reinstate site according to client and company requirements

Performance Evidence

Evidence of ability to:

design and implement infrastructure for enterprise voice over internet protocol (VoIP) and unified communications (UC) systems to meet business requirements using converged networks

evaluate network traffic protocols and bandwidth considerations

configure a UC network

assess performance of convergent networks

test and verify security access levels.

Note: If a specific volume or frequency is not stated, then evidence must be provided at least once.

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Knowledge Evidence

To complete the unit requirements safely and effectively, the individual must:

compare session initiation protocol (SIP), H.323 protocol and media gateway control protocol (MGCP) or media gateway control (Megaco)

define latency, jitter and wander, and implement methods for reducing or eliminating them using jitter buffer, quality of service (QoS), traffic shaping and virtual local area networks (VLANs)

describe the format of a SIP uniform resource identifier (URI)

evaluate and implement SIP trunking to connect enterprise internet protocol (IP)-based communications systems over long distances

identify common G.7xx codes and describe the impact of compression on voice quality

define components of SIP

examine functions of signalling protocols for converged networks

summarise the following:

the client business domain, business function and organisation

current and emerging industry accepted hardware and software products

current and emerging transmission technologies and protocols

networking technologies.

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