Thesis (MBA)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: The difficulty in building a justifiable business case is preventing Fruitways from adopting a unified communication solution. Subsequently the research set out to determine the business value that Fruitways can expect to derive from implementing a unified communication solution before committing to a full-scale implementation. The results of this research have put Fruitways in a position to make an informed decision on whether or not to adopt unified communication. In order to answer the research question a unified communications pilot project was initiated within the Fruitways group using the introduction of Microsoft Lync (a unified communications application) as the event under study. The research described and analysed a unified communications pilot project in a bounded system, Fruitways (the case). The case study made use of abductive reasoning in order to synthesise a case for the business value that Fruitways can expect to derive from implementing unified communication technology. The literature study showed that unified communications provide value to an organisation on four levels; namely, the personal, workgroup, enterprise and infrastructure level. However, participants in the pilot project indicated that they experienced value from unified communication only on three of the four levels as identified in the literature; these levels were: • Personal level. Participants indicated that they felt more productive with unified communications at their disposal. The rich choice of communication methods empowered participants to choose the most appropriate mode of communication given the communication need and context. • Workgroup level. The main drivers of value for participants on this level was found in the increased speed of group tasks, working more effectively across distance and evidence of more effective work practises forming. • Enterprise level. The study showed improved coordination between departments in Fruitways with the deployment of unified communication technology. Surprisingly there was no indication that Fruitways could expect to save significant infrastructure related costs by consolidating communication onto a single data network. The infrastructure related cost saving value proposition that is most often cited by vendors of unified communication systems was not clear for Fruitways. Although the study showed that unified communication presents value to Fruitways, the literature also pointed toward the importance that this value needs to be aligned with the strategic objectives of the business in order to constitute true business value. The business value that unified communication presents to Fruitways does indeed support its strategic objectives.

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Chan, An. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 80-84). / Abstracts in Chinese and English. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Motivations and Contributions --- p.1 / Chapter 1.2 --- Related Works --- p.3 / Chapter 1.3 --- Organization of the Thesis --- p.4 / Chapter Chapter 2 --- Background --- p.5 / Chapter 2.1 --- IEEE 802.11 --- p.5 / Chapter 2.1.1 --- Basic IEEE 802.11 Standards --- p.5 / Chapter 2.1.2 --- Types of Networks --- p.7 / Chapter 2.2 --- Voice over IP (VoIP) Codecs --- p.8 / Chapter 2.3 --- VoIP over WLAN --- p.9 / Chapter 2.3.1 --- System Architecture of VoIP over WLAN --- p.9 / Chapter 2.3.2 --- VoIP Capacity over an Isolated WLAN --- p.10 / Chapter Chapter 3 --- VoIP Capacity over Multiple WLANs --- p.12 / Chapter 3.1 --- Topology Settings and Assumptions --- p.12 / Chapter 3.2 --- Low VoIP Capacity Found in NS2 Simulations --- p.16 / Chapter 3.3 --- Applying Frequency Channel Assignment --- p.18 / Chapter Chapter 4 --- Clique Analysis and Call Admission Control --- p.21 / Chapter 4.1 --- Conflict Graph Model and Cliques --- p.21 / Chapter 4.2 --- Cliques in Multi-Cell WLANs --- p.22 / Chapter 4.3 --- Clique-Based Call Admission Control Algorithm --- p.24 / Chapter 4.3.1 --- Algorithm Description --- p.24 / Chapter 4.3.2 --- Algorithm Performance Evaluation --- p.27 / Chapter 4.3.3 --- Clique-Based Admission Control in Three-Frequency- Channel WLAN --- p.29 / Chapter Chapter 5 --- Time Division Multiple Access (TDMA) on IEEE 802.11MAC --- p.32 / Chapter 5.1 --- Coarse-Grained Time-Division Multiple Access (CTDMA) --- p.33 / Chapter 5.1.1 --- Basic Ideas of CTDMA --- p.33 / Chapter 5.1.2 --- Conflict Graph Modeling of CTDMA --- p.35 / Chapter 5.1.3 --- Parameter Values in CTDMA --- p.41 / Chapter 5.2 --- Possible Realization of TDMA on 802.11 Standards --- p.47 / Chapter Chapter 6 --- Coloring Problem in Wireless Networks: A Theoretical Treatment --- p.52 / Chapter 6.1 --- Coloring of One-Dimensional Linear Network --- p.53 / Chapter 6.1.1 --- Network with Same Link Length --- p.53 / Chapter 6.1.2 --- Network with Variable Link Length --- p.54 / Chapter 6.2 --- Coloring of Two-Dimensional Network --- p.63 / Chapter Chapter 7 --- Conclusion --- p.66 / Appendices --- p.69 / References --- p.80

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Thesis (M.Sc.) - Carleton University, 2002. / Includes bibliographical references (p. 141-144). Also available in electronic format on the Internet.

Typescript. Includes bibliographical references (leaves 63-66).

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Thesis (MTech (Electrical Engineering))--Cape Technikon, Cape Town, 2004 / This work describes research towards the development of a micro-controller based, standalone Internet telephone to be used as an alternative to conventional line telephones. Our definition of 'stand-alone' refers to the unit's capability to perform its function wholly without the need for an attached computer. The unit should be low cost and capable of allowing two users to communicate using the units. Bandwidth usage should be kept low to allow the unit to be used over dial up connections which are prevalent in South Africa. The units should be easy to use as the anticipated users may be unskilled. A module containing a 16-bit micro-controller, an Ethernet controller, flash memory and RAM was chosen as the controller. The module came with a real-time operating system and a TCPlIP stack. The session initiation protocol (SIP) was selected to perform the signalling. SIP uses the session description protocol (SDP) to negotiate the attributes of the media session to be established. The real-time transport protocol (RTP) was implemented to transport encoded audio between the end points. The RTP control protocol (RTCP) was implemented to provide basic quality of service parameters. The ITU-T recommendation G.729 annex A was the voice codec selected. Codec ICs were used to encode and decode the audio. The implementations were designed specifically for a two user, direct communication environment. That is two phone units were developed that communicated directly with each other and not through intermediary servers.

As Voice over IP becomes more prevalent, value-adds to the service will become ubiquitous. Voice over IP (VoIP) is no longer a single service application, but an array of marketable services of increasing depth, which are moving into the non-desktop market. In addition, as the range of devices being generally used increases, it will become necessary for all services, including VoIP services, to be accessible from multiple platforms and through varied interfaces. With the recent introduction and growth of the open source software PBX system named Asterisk, the possibility of achieving these goals has become more concrete. In addition to Asterisk, a number of open source systems are being developed which facilitate the development of systems that interoperate over a wide variety of platforms and through multiple interfaces. This thesis investigates Asterisk in terms of its viability to provide the depth of services that will be required in a VoIP environment, as well as a number of other open source systems in terms of what they can offer such a system. In addition, it investigates whether these services can be made available on different devices. Using various systems built as a proof-of-concept, this thesis shows that Asterisk, in conjunction with various other open source projects, such as the Twisted framework provides a concrete tool which can be used to realise flexible and protocol independent telephony solutions for a small to medium enterprise.