A B S T R A C T. Index Trems- Wi-Fi P2P, WLAN, Mobile Telephony, Piconet I. INTRODUCTION

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1 Wi-Fi Calling Using Android Phones. Mr.Dnyaneshwar Bhusari, Mr.Gaurav Mokase, Mr.Prasad Waghmare, Ms. Kundan Kumar Department of Information Technology D.Y.Patil College of Engineering, Akurdi, Pune, India A B S T R A C T The concept of voice transferring from one mobile to another mobile using Bluetooth/ Wi-Fi connectivity is discussed in this paper. Bluetooth is the connection which can be used as a link to share data among devices within a Personal Area Network. Now-a-days mobile phones come with Bluetooth facilities. Wi-Fi is a WLAN standard which is used to share data over the transmission range larger than Bluetooth. Wi-Fi can also be used to share the voice from one mobile to another by receiving the data from one mobile (user) and sending the data to the destination user. The basic concept behind this data transferring is SOCKET PROGRAMMING. Voice telephony over mobile is currently supported at a cost using service provider such as GSM, or using IP service provider at cheaper cost. The purpose of this research is to design and implement a telephony program that uses Wi-Fi in p2p (Peer-to-Peer) or WLAN (Wireless Local Area Network) as a means of communication between mobile phones at no cost. The system will allow users to search for other individuals within Wi-Fi range and to establish free p2p voice connections, or to establish virtual connection through Access Point. Index Trems- Wi-Fi P2P, WLAN, Mobile Telephony, Piconet I. INTRODUCTION Use of Wi-Fi-capable mobile hand held devices is gaining momentum on university campuses and other campus like environments on the basis of cloud computing. In addition, users often work as a group to perform collaborative tasks. Consequently, there is a demand for group communication applications in mobile devices and a need to provide middleware support for such group communication. The system presents two common grouping scenarios as observed on campuses. We then present data dissemination strategies for these grouping scenarios. We concentrate on update-based applications such as updates for file repositories and version controlling systems. Thus, the group communication protocols for data dissemination will use short messages encapsulating control messages and updates. We evaluate the effectiveness of the protocols through an Android based middleware implementation as well as simulations. Our experiments demonstrate that the protocols deliver the updates to the entire group of users within desired (low) time bounds in real life scenarios. The support of telephony services over mobile phone has been used everywhere using technology such as GSM(Global System for Mobile) and 3 Generation mobile telecommunication 3G, but at high cost. On the other hand, IP telephony try to reduce the cost for supporting this service over mobile phone, but it is facing difficulties since the same feature is supported on desktop and laptop at lower complexity. The challenge is to provide the same service over mobile phone at no cost, as it has been described in this paper; two approaches are suggested in this paper to meet the objective of having free telephony services over mobile phones. These are the use of WIFI technology over AP and WIFI over p2p (Peer-to-Peer). In addition, a novel algorithm has been invented to tackle the first fundamental problem of designing Adhoc and p2p telephony using Wi-Fi, which will not rely on any central database, and will not require , IJAFRC and NCRTIT 2015 All Rights Reserved

2 users to register to any service. This can be achieved through executing an algorithm to map a mobile number to a unique IP address that can be used to establish p2p connection to any other mobile phone running the same algorithm. Ad-hoc network is communication network that establishes contact with multiple stations in a given area network without the use of access points or server. This mobile telephony software lends itself to be a completely distributed system in terms of architecture. Distributed computing architecture is described as a number of autonomous processing systems that are interconnected by a computer network and that co-operate in accomplishing the assigned tasks. Currently, servicing IP addressing in traditional networks are managed by two technologies, the DNS (Domain Name System), and DHCP (Domain Host Configuration Protocol). DNS Servers resolve humanfriendly domain names to IP addresses for computers and resources on the Internet globally. DNS keeps website addresses consistent regardless of the physical location or routing protocol. DHCP helps to make automatic network configuration, IP address allocation, for network devices. Whenever a new device is connected to the network the device will request for an IP address from the server, which will allocate the address to the networked device for a specific time period, where dynamic network addressing is used. The DNS mechanism cannot be applied to p2p Ad-hoc network, The telephone number & area code are in the format of 0-9 digits for the area code and 0-9 digits, except for the register with any central service such as DHCP and DNS. First number that cannot be given the value 0 comprise off since the mobile software IP addressing facility lacks 9,000,000,000 numbers unique numbers. IPv6 which has coordination with central database, then IP address allocation and IP conflicts present a major issue. The solution to the IP problem was tackled in a very innovative way that did not compromise the software's p2p and Ad-hoc values. GSM mobile phones come with SIM (Subscriber Identification Modules) cards that help identify users uniquely in GSM networks, by mapping SIM numbers to subscribers and unique telephone address of the subscribe. There is no two phones can have the same number in the same network. However the GSM approach relies on centralized system of communication routing and management. However, the solution proposed in this paper will only rely on the fact that each user has a unique phone accommodates for more spaces was a better candidate than IPv4 which has fewer space and is already being exhausted and already in use by many traditional and wireless networks. II RELATED WORK In fields of wireless technology and networking, there are many applications that are developed for establishing wireless calls. The developed applications however require a carrier. For Example: A SIM-card connection or a Network connection to make calls. Also there is another technology i.e. the Wi-Fi technology which connects the devices with each other within a particular range. Along with this there are applications like Skype, Nimbuzz, etc. that uses VOIP protocol to make calls that needs network connection. Cloud computing has become very popular because it moves the processing efforts from the local devices to the data centric facilities. Therefore, any Internet enabled devices like a smart phone, Tablets etc., could be able to solve complex operations like creating, editing files online by simply passing specific arguments to a service running at the data centers level that will be capable of giving back the results in a very short time. The cloud services mainly include sharing, online storage, Web-based and database processing. By adapting the Cloud computing, it becomes easy to share the virtualized resources. Here Users do not need any background knowledge of the services and it s very easy to maintain when compared to any traditional technologies , IJAFRC and NCRTIT 2015 All Rights Reserved

3 Cloud Computing offered a model which will the classroom completely, it would easily meet the needs of the administrative staff, student affairs like education, training and research related needs of students and academic staff who work especially in the educational institutions. Design of this infrastructure on cloud platform will optimize all the requirements like Computer resources (processors, memory, storage, bandwidth, etc.). Infrastructure scales up and down quickly to meet the demand. The most important feature of the applications offered by cloud is their availability and scalability. User friendly interfaces of cloud based Applications enable users to successfully enlarge their computing environment. Cloud-based applications allow data to be planned at different places rather than the applications themselves. This enables users to rapidly build customized solutions around their content items. III PROPOSED SYSTEM The primary feature of a voice application is that it is extremely delay-sensitive rather than errorsensitive. There are several approaches that have been developed to support delay-sensitive applications on IP networks. In the transport layer, UDP can be used to carry voice packets while TCP may be used to transfer control signals, as long delay is caused by TCP by its retransmission and three-handshake mechanism. The Real-Time transport protocol (RTP) is a compensative protocol for real-time deficiency on packet networks by operating on UDP and providing mechanisms for real-time applications to process voice packets. The Real- Time Control protocol (RTCP) provides quality feedback for the quality improvement and management of the real-time network. Several signaling protocols have been proposed for IP phone applications. SIP is peer to- peer protocols. Being simple and similar to HTTP, SIP will bring the benefits of WWW architecture into IP telephony and readily run wherever HTTP runs. It is a gradual evolution from existing circuit-switched networks to IP packet-switched network. A lot of work has been done to implement IP phones over data networks, even on the internet (Skype), but almost all work has been done mainly using secure communication channels and fixed IP phones. A lot of work has been done to connect different heterogeneous networks like UMA (Unified Mobile Access) technology that allows the use of both GSM network and Wi-Fi networks (indoors) for calling. A. Management of call between Wi-Fi to Wi-Fi Figure 1. Register IP phone in the Routing table A number (user 2) is dialed using Android application from user 1 s mobile unit. The application then sends the number in 128 bit encrypted form to the router, requesting a call to be placed (Figure (a)). The router in the Wi-Fi network searches its routing table for the desired number and if the number is active then a packet of data signaling an incoming call is sent to the corresponding IP on the Wi-Fi network.the , IJAFRC and NCRTIT 2015 All Rights Reserved

4 application on user 2 s mobile unit alert s the user of an incoming call. The routing table gets updated to both the IP mobile units as being busy (Figure (b)). When the user 2 accepts the incoming call, real time transfer of voice data packets starts between the two mobile units.the header of each packet is encrypted in such a way that the router can decrypt it and route it to the required mobile unit. While the actual voice data packets are encrypted in such a way that only the other mobile unit can decrypt and it cannot be decrypted at the router end. When the call is broken down the routing table is again modified and the busy status is changed. If the user at the other end doesn t want to take the call and presses the hang up button then the user at the first end is send a message that the user dialed is busy. Figure 2. User 1 dialing User 2 s number Figure 3. User 2 receiving a call from User 1 IV. CONCLUSION AND FUTURE SCOPE Voice over telephony is a challenging research topic. In this paper we have proposed a system which works under socket programming. The system is transparent to the user, where the clients need to register their IP address on the server. Due to this, all the active clients within the network are known to server and clients themselves. Now, using smartphone clients just have to dial another client to which it wants to communicate and the call and messages happen. In future, if possible this project is extended not making just audio calls but video calls also. And future scope is: Handheld Mobile devices that are Wi-Fi-capable are becoming ubiquitous in today s world. Such devices are increasingly being used by users (Example. Students) on campus to replace desktop computers for flexibility Often, there is a need for users on campuses to work in small groups to execute collaborative tasks. For Example, students working in the same class project need to collaborate on a shared report, or co-ordinate their meeting schedule. These groups are usually formed amongst users who trust each other, are friends, and could make use of applications such as group calendars, group chats and centralized file management systems. However, in addition to the problems that any distributed system introduces, these applications have to meet the challenges of constantly changing topology, churn rate and limited resources offered by mobile systems. On a university campus with enrollment of thousands of students, one can see formation of thousands of groups of friends and the potential popular use of group based applications , IJAFRC and NCRTIT 2015 All Rights Reserved

5 V. REFERENCES [1] IEEE-International Conference On Advances In Engineering, Science And Management (ICAESM ) March 30, 31, 2012 VOICE OVER IP VIA BLUETOOTH/WI-FI PEER TO PEER, S.Sundar D.C.E 1, M. Krishna Kumar 2, P. Selvinpremkumar 3, M.CHINNADURAI (Ph.D Scholar) 4, CSEE.G.S.P.E.C, Nagapattinam 5. [2] Chian C. Ho,tzi-Chiang Tang,Chin-Ho Lee, Chih Ming Chen,Hsin-Yang Tu,Chin-Sung Wu,Chao-His Chang,Chin-Meng Huan, H.323 VoIP Telephone Implementation Embedding A Low Power SOC Processor, / 03 IEEE.,p [3] Ruan Gaofeng, Cailing, Online Course Development Based On a Public Cloud Computing Infrastructure, IEEE [4] B. Regis J, and D. W. Gregory, "Voice and Data Communication", 4rth ed. California, Berkeley: McGraw Hill, [5] F. Borko, and M. Ilyas, "Wireless Internet Handbook Technology, Standards, and Applications", 1st ed. NY, New York: McGraw Hill, , IJAFRC and NCRTIT 2015 All Rights Reserved

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