VOIP Technology to Make Voice Calls

VOIP Technology to Make Voice Calls Faculty of Engineering, Architecture and Science Computer Networks Program Course Number CN8814 Course Title Network Mathematics and Simulations Semester/Year Summer 2015 Instructor Dr. Alagan Anpalagan Lab Assignment No Lab 2 Assignment Title QoS for VOIP Submission Date June 21,2015 Due Date June 21,2015 Student Name(s) Ishtiaq Ahmed Mohammad Shariful Ikram Student ID(s) 500666959 500543793 Signature(s) [emailprotected] [emailprotected] Table of Contents (Jump to) Objective Introduction Lab topology: Question 1: Question 2: Question 3: Question 4: Question 5: Question 6: Question 7: Conclusion   Objective In this lab, we have used VOIP technology to make voice calls. We have analyzed by implementing WFQ,CBWFQ and LLQ queuing techniques for improving the call quality. Introduction Quality of Service or QOS is used to increase the performance of voice application. End user can get voice call performance based on the QOS. It is a very critical implementation for voice over IP or VOIP based calls.QOS deals with reducing the delay and drop of packets compare with low priority traffic. If the delays are long, voice quality will be noisy and conversation will be very bad.QOS make sure the standard voice services by using existing resources. With this lab we have learned fragmentation with frame relay, traffic shaping techniques for improving the voice quality. In the first part of this lab, we will make voice call with FRF12 and analyze the voice quality. Then we will implement WFQ,CBWFQ and LLQ queuing techniques and will recognize suitable techniques for voice. In our network topology, router 7 is working as frame-relay switching. Router 1 and Router2 are connected with two telephones. Lab topology: Figure 1 Lab 2 topology We have configured VOIP peer between router 1 and router 2 with our lab instruction. 1. Configure voice over IP over Frame-Relay (FRF.12) and appropriate dial peers at Router 1 and Router 2 with the following information: Committed burst size (Bc) = 12000 bits Committed bit rate (CIR) = 64 kbps Frame relay fragment = 1500 bytes Voice codec: G.729 In this lab, we have used below information between router 1 and router 2: Following table shows initial configuration between router 1 and router 2: 2. Test your configuration by making a call between the two phones. Note the voice quality. With making a call between these phones, we have found voice quality is good. 3. Generate two ping traffic flows with 3000-byte packet size across PVC1. Make a voice call. Note that the voice quality deteriorates. To increase the traffic flow, we have changed the packets size 3000 byte by using extended ping command. After that we make call between our phones and gets distort voice because of delay and jitter. 4. Configure the frame-relay fragmentation and traffic shaping at the serial interfaces to improve the voice quality (the fragment delay is required to be less than 10 ms). To improve the voice quality, we have configured frame-relay fragmentation and traffic shaping between router 1 and router 2 serial interfaces: Question 1: How do you choose appropriate fragment size and committed burst size (Bc) to implement the frame-relay fragmentation and traffic shaping? Why the voice quality is improved after the configuration? In our lab requirements, fragment delay is less than 10 ms. So we have calculated the fragment size based on the following formula: Fragment size (Maximum): †¢ Fragment_size = (0.01 sec) * CIR = (0.01 sec) * 64 kbps = 80 bytes Parameters of Traffic Shapping: †¢ Burst size (Committed): Bc = 0.01 seconds * CIR = 640 bits After these configuration, we have made voice calls and have get better voice quality. Voice quality have improved because of smaller fragmentation. Question 2: Explain why FIFO queuing should not be used if fragmentation is configured. Fragmentation helps to break large data traffic into smaller data traffic. For this voice traffic gets priority and have served faster. In the FIFO technology, if any large data entered into the queue then in that time if any voice traffic comes, then it needs to be wait until large data traffic finishes. There is no way to prioritize the voice traffic in FIFO techniques. 5. Set IP precedence of the voice traffic to 5. Generate two ping traffic flows with 3000-byte packet size across PVC1. Make a voice call. Note the voice quality. In the type of service or TOS byte of Header, we have set IP precedence. IP precedence can identify class of services. Out of seven bits, left three digits are use in IP precedence. These values can be from zero to seven. Here larger number means higher priority. We have set IP precedence 5 and we make ping traffic with 3000 bytes in the PVC1.We have get voice quality good than the previous quality. Following table shows the configuration between router 1 and router 2: 6. Configure a RTP priority queue for voice traffic. Generate two ping traffic flows with 3000-byte packet size across PVC1. Make a voice call. Note the voice quality Following table shows the configuration between router 1 and router 2: We have generated two ping traffic between router 1 and router 2 with 3000 bytes packet size. After that we have test voice calls between our phones. We have get voice quality is good than previous. It has happened because 27 kbps bandwidth is reserve for voice packets and voice packets has no need to wait in the queue. Question 3: Determine the minimum bandwidth required for the RTP priority queue configuration. We have configured voice traffic with RTP priority queue. Our size of voice packet is 66 bytes. So the minimum requirement of bandwidth is 8*66/0.02 or 26,400 bps or 26.4 kbps. We have used G729 codec and voice payload size is 20 bytes. We set our lab bandwidth is 27 kbps. Question 4: Compare the voice qualities at Steps 4, 5, and 6, and explain the causes of quality differences. To compare voice qualities between steps 4,5, and 6, we have found voice quality is worst in step 4.It has happened for voice call and ping is ready at a time, all packets are transfer in the same queue. So lots of packet are drop because of more queuing delay. Voice traffic has high priority when we use IP precedence 5 in step 5.Our voice and data traffic still use the same bandwidth. Data traffic still transfer even voice traffic arrives. So ping traffic transfers and voice traffic waits. For this, voice quality is not good because there is no bandwidth reservation for voice traffic. In step 6,we have configured 27 kbps bandwidth in RTP priority queuing. This bandwidth is reserve for voice traffic. So voice packets always use this defined bandwidth and voice traffic has priority than ping traffic. So in this case, voice quality is better. 7. Configure three classes: VoIP, VoIP signaling, and default. Reserve bandwidth 25 kbps for VoIP class, and 8 kbps for VoIP signaling class, respectively. Do not assign priority queue to any class. Three different classes has been created in this case. They are assign with fix bandwidth. We have used access-lists for voice traffic classification. Following table shows configuration between router 1 and router 2. Question 5: Explain the differences and similarities between CBWFQ and WFQ. CBWFQ can utilize bandwidth effectively compare to WFQ. It is actually the extended version of WFQ. During the congestion period, CBWFQ can guarantee the minimum bandwidth. It will switch when it gets more bandwidth again. In the CBWFQ, we can define different classes and each different classes we can assign separate bandwidth. The differences and similarities between WFQ and CBWFQ are as follows: Similarities CBWFQ has default traffic class but if we do not define this class then CBWFQ and WFQ has no difference in queuing techniques. Differences Based on the user define classes ,CBWFQ can traffic queuing but WFQ cannot queue traffic. For the traffic flow, CBWFQ can make sure specific bandwidth for it but WFQ can not guarantee that. Network administrator can use CBWFQ more flexibly. They utilize this CBWFQ with different priorities for different types of traffic. Question 6: Based on the above configuration, what are the maximum and minimum bandwidths that are available for the default class? The maximum bandwidth that are available for the default class was 64 kbits/s Default class is use all available bandwidth like bandwidth = CIR = 64 kbit/s if there are no voice traffic Because if there is no voice or voice signaling traffic then the default class is use all available bandwidth (bandwidth = CIR = 64 kbit/s). The minimum bandwidth that are available for the default class is 31 kbit/s But if for voice or voice signaling flow, the reserving bandwidth will be 25 kbits/s and 8 kbit/s respectively. Other will be available for default class. So, minimum bandwidth available for default class is: 64kbps (25kbps + 8kbps) = 31 kbit/s We have generated two ping traffic through PVC1 and at the same time we do voice call. Our packet size is 3000 bytes. We have found same voice quality like step 6. 8. Establish a voice call between the two phones. At the same time, generate two ping traffic flows with 3000-byte packet size between the two routers. Note the voice quality. We have generated voice calls in our phones. At the same time between router 1 and router 2 we have generated 3000 byte ping traffic. We have found the acceptable voice quality. For voice traffic we have assign different class but there is no priority assign for this class. So, in the receiver end, both data and voice packets are receive similar way. So voice is not be clear because of delay introduce. 9. Configure a priority queue for VoIP class using LLQ. We have configured priority queue with LLQ. Following table shows the configuration: 10. Make a voice call between the two phones. Note the voice quality. After the configuration, we have make phone call with 3000 byte ping traffic in the same time. We found the improved voice quality. Question 7: Explain why the voice quality is improved after the priority configuration. Voice quality has improved for priority configuration. Previously we do not assign priority for different define classes of voice and voice signaling. So, voice quality is improved because of priority assigned. So for any ping traffic comes first it is served first. With the priority queue configuration, it has been resolved. So for any voice traffic arrival, it is use priority queue with allocated bandwidth. Conclusion In this lab, we have configured two routers and make phone call. We have observed the different call quality. Call quality depends on traffic flow. Traffic flows depends on different parameters like delay, jitter, loss of packets, etc. These hampers the quality of services. We have implemented three queuing discipline here like WFQ,CBWFQ,CBWFQ with LLQ. The objective of this lab is to analyze and improve the quality of voice service. We have found, the best voice quality when we have implemented different class for voice traffic and assign high priority value for voice traffic. Page | 1

I declare that I have wholly undertaken the study reported herein under supervision Essay

The Lord has been faithful in granting me the strength, wisdom, knowledge and the courage needed throughout the period of study. My sincerest appreciation goes to my supervisor, MR. MICHAEL NKONYAA for his guidance and constructive criticism through the preparation of the work. He is largely responsible for the success of this work and I am very much grateful. To my husband Solomon Kweku, to my colleagues in MBA Finance 2012/2013 in whose company I stayed and formed my thoughts I say God richly bless you for the fellowship and love we shared. To the Staff and Management of Growth Capital Microfinance, wish to express my sincere gratitude to you for your support and co-operation. Finally, I wish to thank all authors of various research works and articles I made use of in writing of this work, indeed, your research works and articles have served as major sources of literature and knowledge. ABSTRACT This study examined effects of microfinance on small and medium enterprises in the Accra Metropolis, in the Greater Accra Region. .The population of the study comprised clients and staff of Micro finance Institutions (MIF). A sample of 60 clients and eight staff was used for data collection. Two interview guides were used separately to collect data from staff and clients. The return rate of data collection was 8(100%) for staff and 55(91.7%) for clients. Data collected was analysed manually and electronically. The statistical product and service solution (SPSS) was used for the electronic analysis in which descriptive statistical tools were used for data presentation and discussion. Results of the study indicated that microfinance s impacted positively on the social and economic lives of SMEs operators. The research also indicates that MFIs have had a positive effect on the growth of SMEs. Some of the critical contributions of MFIs include; greater access to credit, savings enhancement and provision of business, financial and managerial training. Irrespective of the contributions of MFIs to SMEs, there are challenges that affect their operations of both SMEs and MFIs. The major challenge faced by SMEs is the cumbersome process associated with accessing credit of which collateral security and high interest rate are major setback. The MFIs on the other hand, face some challenges relating to credit misappropriation and non-disclosure of the relevant facts of their businesses. In the final analysis, the research clearly reveals that MFIs have a positive effect on the growth SMEs. In other to enhance a sustained and accelerated growth in the operations of SMEs credits should be client-oriented and not product- oriented. Recommendations were made to MFIs, Specifically, MFI was asked to put in measures that could help reduce interest rates, train operators of SMEs on proper business practices Proper, extensive monitoring activities should be provided for clients who are granted loans and SMEs were asked to adopt effective bookkeeping modalities.

Electronic Gadgets Essay

Every time you turn around, your children are requesting the newest version of a technological gadget. While one child madly texts friends in the back seat of the car, the other is scanning Facebook, admiring his 378 friends. You may simmer with frustration that their grades aren’t up to par, considering whether or not you should take their phones and/or computers away for a while. But then you remember the money you’ve spent on eBooks and learning games and you wonder, â€Å"Are electronic gadgets the problem or the solution?† The answer is, â€Å"Yes† and â€Å"Yes†. Therein lies the conundrum. As with most things in life, the true answer lies somewhere in the middle. see more:modern gadgets essay The Pros Research shows that eReaders, such as Amazon Kindle products, not only increase children’s interest in reading, but also promote their reading comprehension. In a survey of 1200 eReader owners, Amazon reported that the owners’ purchases of non-eBooks increased by 3.3 times. It appears that reading begets more reading – and with kids, that is a wonderful thing. Current education trends recognize that not everyone can read text and immediately comprehend the meaning. eReaders offer multi-media applications such as instant dictionaries, pictures, or graphics that help to illustrate examples. There are eGames that help reinforce what a student has just read. Math and vocabulary games have been proven to increase students’ interest in the classroom, as well as raising their test scores. But as Newton’s Laws of Motion illustrate; for every action, there is an equal and opposite reaction. The Cons In the electronic gadget arena, the negatives can be an individual’s own lack of discipline. As you sit at your computer working on a project, how often do you notice you have a new email and instantly check it? You might even type out a quick response and then get back to work. Or perhaps you think about the event you are attending at the end of the month and quickly search a few online stores to see if you can find a gift for the host. Now picture that same scenario, but imagine you are your child. He or she is working on a homework assignment that requires analytic thought, but every fifteen seconds there’s another ding or beep indicating a text has come in, Facebook has been updated, and so on. It is impossible for a child’s mind to remain engaged on the task at hand if he/she is continuously interrupted by outside distractions. Even the most disciplined of children feel the strong pull of peer pressure, and saying, â€Å"I don’t respond to texts while doing homework,† is an unlikely response to friends’ queries. You Are The Solution Electronic gadgets can be tremendous learning tools. They’re able to reach a myriad of learning styles and create a forum where children can connect with the learning style that engages them in the learning process. They make people want to read more. But, they can also be the reason that your child didn’t spend adequate time studying for tomorrow’s math quiz. You can become a part of the solution by setting an example that work time is gadget free time. Unless your child is using his/her new Kindle Fire to read a book, or play a learning game under your supervision, homework time can be gadget free time. That goes for you too. Perhaps evenings at home can be gadget free while homework is completed and dinner is shared. With a little honest conversation with your children, and some reasonable boundary setting, your children’s gadgets can be both the perfect tool and the perfect toy. What are your thoughts? If you think (like we do) that gadgets and education can co-exist in perfect harmony, then let us know in the comments section. And to find out how we are using technology in our tutoring sessions, give us a call!

Free French Mobile Applications

Free French Mobile Applications If youre looking for free French apps, youre in luck: there is a wide variety, from dictionaries to learning programs. Heres a list of mobile applications related to French.2Lingua KidsLearn basic French in this app written by and for middle-school students.Classics2GoA small collection of French books.Free French TutorInteractive study tools.FrenchRadioFind French radio while youre on the go.French StartSmall app to begin learning French vocabulary.French Verbs 650Learn French verbs and their English translations.French Word of the Day (Declan Software)A new word every day, with sound file.French Word of the Day (Prometoys Limited)Daily word with translation and sample sentence.French WordPowerDaily word with pronunciation and translation, plus quiz and option to save words.Learn French - French AppsFour apps for learning a bit of French: alphabet, numbers, gender, and phonemes.Learn French by LoquellaLearn and practice French grammar, vocabulary, and pronunciation with lessons base d on the Foreign Service Institutes method and materials. Learn French QuickFrench flashcard program.Learn French with BusuuTwenty lessons with option to purchase more.Littrà © French dictionaryDictionary of French from the 17th-19th centuries.Living Language - French for iPadEleven free French lessons, with the option to purchase 35 more.RATPOfficial app to help you make sense of Pariss mà ©tro and bus.SpeakEasy French LiteThe free version includes 169 French travel phrases.If you dont have a mobile device, you might be interested in similar online and offline resources:     French verb conjugator  Ã‚  Ã‚  French vocabulary lessons and lists  Ã‚  Ã‚  French word of the day

Ethnicicty and minority relations essays

Ethnicicty and minority relations essays What do we mean by the social construction of identity? Any attempt to compare the suffering of the blacks and Jews would seem likely to be felled by the waves of invidious comparisons. That is because any such comparison is likely to be seen, however obliquely, as an endeavour to answer the question: which group has suffered more- blacks or Jews? Indicatively, this question could be perceived to address the point of not who suffered more, but why did they suffer? This can be answered in relation to the social construction of identity. The Jews and Blacks identities were socially identified and regarded by others as not belonging to the majority group during that historical period. So what do we mean when we talk about the social construction of identity? The concept of identity has always been blurred but in recent years, the study of identity has been greatly enhanced by cross-cultural studies in history, sociology, anthropology and psychology. The key point of departure for much discussion is the real world observation that nationalist, regional, racial and ethnic mobilisations are occurring globally and pervasively (Cohen, 1994). However, at the same time, within national, racial or regional units of identification, there are other kinds of groupings that are organised often on the social axes of age, gender, class, religion, race or disability that form their own identity. These too are claiming rights or advantages in the name of their particular social affiliation. Before we can begin to understand the social constructions of identity we need to analyse how and why these identities come to be assimilated in our society? Although identity construction may occur in any part of a society through social change and circumstance and of human interpretation and action, it must be noted that social construction occurs contingently upon the situation in which the ...

Adam Smith and Karl Marx Economic Theories Essay

Adam Smith and Karl Marx Economic Theories - Essay Example Most of the theories in economics today are based on the ideas of Smith as well as Marx and Keynes. These individuals have different ideas on how the economy works and the best economic system that would ensure the good of all people in the society. They also differ on the role the government is supposed to take to drive the economy to prosperity. All these differences are prompted by the views held by different theorists regarding human nature and this will be the subject of our discussion in the next section but emphasis on the role of human nature in economic theories of Smith and Marx. Adam Smith (1723-1790) As stated earlier, Smith is regarded as the father of modern economics and capitalism. According to him, human beings are social and as such they have a tendency to care for each other. They are also driven by self-interest but this does not deter them from empathizing with and help each other (Skousen, 11). This is the basis of his economic theory written in his book An inqu iry into the nature and causes of the wealth of nations or what is commonly referred as Wealth of Nations in 1776 (Das Kapital). This brought about industrial revolution and emergence of capitalism as the dominant mode of production (Hall). The capitalist economy is based on the mechanism of free markets whereby Smith believed that individuals driven by self-interest and not infringing on the rights of others can in the process benefit the whole society (Hall). The market is driven by the ‘invisible hand’ whereby producers produce goods and services and take to market where they meet buyers who are in need of such goods for consumption. In this case, the buyer and seller only meet when exchanging products and do not negotiate on the quantity to be produced or bought (Skousen, 10). Individuals are assumed to self-regulate themselves in this economy and as such there is no need for government intervention unless to provide public goods such as infrastructure and make sure people adhere to contracts. There is thus free movement of labour, capital and goods (11). Smith’s economic theory is also based on economic independence. Natural liberty according to smith is a fundamental human right thus individuals are given freedom to do what they want (Hall). They produce what they want, at a price they want but the principle of justice must be withheld, that is, there is freedom of production and exchange. As such, all the actors in the economy (workers, landlords and capitalists) work in harmony; there is no conflict of interest (Skousen, 27). In such case, Smith assumes that human beings are honest, just according to societal rules. They can therefore, pursues self-interest without offending or ignoring the needs of others but for the benefit of all. Smith did not envision greed and egotism in human nature. Furthermore, capitalists have to consider the interests of consumers if they want to make profit. Human beings are competitive in nature. This a ccording to Smith was not a negative thing but affected the economy positively, that is, is led to economic growth (Hall). Man should therefore â€Å"bring his industriousness and capital into competition with those of others to create harmony† (Skousen, 27). Competition leads to determination of prices in the market thus the market is always in the equilibrium. The producer is able to get profit for his produce and the consumer benefits from low prices as well as improved quality (to lower prices, manufacturers improve technology thus produce quality goods at low cost). As such economic prosperity is achieved through economic independence. Karl Marx (1818-1883) Smith and Marx had very different views regarding human nature and as such

Constitutional conventions should be put on a legal footing. However, Essay

Constitutional conventions should be put on a legal footing. However, there is no clear agreement as to what amounts to a convention. DISCUSS - Essay Example 1917). It could be described also as â€Å"an informal and uncodified procedural agreement that is followed by the institutions of a state† which (Wikipedia, 2007) Hoar (1917) in discussing a constitutional convention as a means of changing or amending written constitutions, told of its being an American origin. He noted the fact written constitutions themselves originated in the US. The idea of a constitution convention is given importance in the light of it purpose, that is making or changing the constitution. Characterizing that the idea of a constitution is â€Å"to signify something superior to legislative enactments† or â€Å"a body of fundamental principles of government which are beyond the control of the Legislature.† Hoar (1917) described a constitution as â€Å"a social compact, by which the whole people covenants with each citizen, and each citizen with the whole people, that all shall be governed by certain laws for the common good.†(Mass. Const., Preamble.) He explained it is â€Å"the Anglo-Saxon theory that government is in some way based upon a contract between the people and the State† (Hoar, R. 19 17). In applying the principle of constitutionalism of the US, Hoar (1917) noted that however, Americans both the terms of the â€Å"unwritten British constitution† and by the â€Å"charters or other written instruments whereby Great Britain directed their government† which he described to be â€Å"suspended the moment the colonies declared their independence,† as â€Å"the colonies reverted to a state of nature† (Ch. II  §8 pp. 26-28) (Hoar, R. 1917, Chap 1) It is an accepted principle in democracy that power belongs to the people. When we say people we are referring to those who can actually vote on issues or elect their leaders. This right of the people to â€Å"have the right to change their form of government at will, using whatever method suits them (Ch. II  §2, p. 12)† In describing the nature of the right of the people, Hoar (1917) said