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Voip in Mobile Phones VOIP IN MOBILE PHONES Abstract Voice over IP (VoIP) is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone. We explain the introduction of VoIP in the year of 2005 and its progress from there on. The meaning of voip and the purpose of VoIP is discussed here. Moreover the technological advancements in the field of VoIP in mobiles has been discussed. The advantages and also the demerits of VoIP has been included .VoIP in mobies has grown drastically and is one of the advanced way of communication at low cost. This is the topic for our presentation “VoIP in mobiles” INTRODUCTION While the emergence of VoIP, or voice-over-Internet protocol, technology has already helped push down the cost of making a phone call, now it’s starting to have a deflationary impact on the world of mobile, where call charges remain stubbornly high. In the meantime, the ongoing adoption of 3G broadband and the inclusion of Wi-Fi in many high-end phones is drawing a growing amount of attention to mobile VoIP services. Indeed, research firm Disruptive Analysis predicts that the number of VoIP-over-3G users will top 250 million by the end of 2012 — from virtually zero in 2007. VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs which encode speech allowing transmission over an IP network as digital audio via an audio stream. The choice of codec varies between different implementations of VoIP depending on application requirements and network bandwidth; some implementations rely on narrowband andcompressed speech, while others support high fidelity stereo codecs. VoIP is available on many smartphones and Internet devices so that users of portable devices that are not phones may place calls or send SMS text messages over 3G or Wi-Fi. Today is the world of mobility. Only thing is that is true mobile is Mobile Phoens. Calling from mobile phonesare much expencive. Cheapest calling method is pc to pc calling. It wont cost anything because it VoIP. In this semianr we look into implementing VoIP in mobile phones. The diffrent network like GPRS/EDGE, Bluetooth, WiFi etc are common in mobile phone. We look into each and advanteages and disadvantages of each. HISTORY 2005 Early experiments proved that VoIP was practical and could be routed by Asterisk even on low end routers like the Linksys WRT54G. suggesting a mesh network (e.g. WDS) composed of such cheap devices could similarly support roaming mobile VoIP phones. These experiments, and others for IP roaming such as Sputnik, were the beginning of the 5G protocol suite including IEEE 802.21and IEEE 802.11u. At this time, most mobile operators attempted to restrict IP tethering and VoIP use on their networks, often by deliberately introducing high latency into data communications making it useless for voice traffic. 2006 In the summer of 2006, a SIP (Session Initiation Protocol) stack was introduced and a VoIP client in Nokia E-series dual-mode Wi-Fi handsets (Nokia E60, Nokia E61, Nokia E70). The SIP stack and client have since been introduced in many more E and N-series dual- mode Wi-Fi handsets, most notably the Nokia N95 which has been very popular in Europe. Various services use these handsets. 2008 In spring 2008 Nokia introduced a built in VoIP client to the mass market device (Nokia 6300i) running Series 40 operating system. Since then other dualmode WiFi capable Series40 handsets have been equipped with integrated VoIP (Nokia 6260 Slide, Nokia X3-02, Nokia C3-01, Nokia Asha 303...). Nokia maintains a list of all phones that have an integrated VoIP client in Forum Nokia. Aircell's battle with some companies allowing VoIP calls on flights is another example of the growing conflict of interest between incumbent operators and new VoIP operators. 2009 By January 2009 OpenWRT was capable of supporting mobile VoIP applications via Asterisk running on a USB stick. As OpenWRT runs on most WiFi routers, this radically expanded the potential reach of mobile VoIP applications. Users reported acceptable results using G.729 codecs and connections to a "main NAT/Firewall router with a NAT=yes and canreinvite=no.. As such, my asterisk will stay in the audio path and can't redirect the RTP media stream (audio) to go directly from the caller to the callee." Minor problems were also reported: "Whenever there is an I/O activities ... i.e. reading the Flash space (mtdblockd process), this will create some hick-ups (or temporarily losing audio signals)." The combination of OpenWRT and Asterisk is intended as an open source replacement for proprietary PBXes. The company xG Technology, Inc. had a mobile VoIP and data system operating in the license-free ISM 900 MHz band (902 MHz – 928 MHz). xMax is an end-to-end Internet Protocol (IP) system infrastructure that is currently deployed in Fort Lauderdale, Florida. 2011 The mainstreaming of VoIP in the small business market led to the introduction of more devices extending VoIP to business cordless users. Panasonic introduced the KX-TGP base station supporting up to 6 cordless handsets [5], essentially a VoIP complement to its popular KX-TGA analog phones which likewise support up to 4 cordless handsets. However, unlike the analog system which supports only four handsets in one "conference" on one line, the TGP supports 3 simultaneous network conversations and up to 8 SIP registrations (e.g. up to 8 DID lines or extensions), as well as an Ethernet pass-through port to hook up computers on the same drop. In its publicity Panasonic specifically mentions Digium (founded by the creator of Asterisk), its product Switchvox and Asterisk itself. Several router manufacturers including TRENDnet and Netgear released sub-$300 Power over Ethernet switches aimed at the VoIP market. Unlike industry standard switches that provided the full 30 watts of power per port, these allowed under 50 watts of power to all four PoE ports combined. This made them entirely suitable for VoIP and other low-power use (Motorola Canopy or security cameraor WiFi APs) typical of a SOHO application, or supporting an 8-line PBX, especially in combination with a multi-line handset such as the Panasonic KX-TGP (which does not require a powered port). Accordingly, by the end of 2011, for under US$3000 it was possible to build an office VoIP system based entirely on cordless technology capable of several hundred meters reach and on power-over-ethernet dedicated wired phones, with up to 8 DID lines and 3 simultaneous conversations per base station, with 24 handsets each capable of communicating on any subset of the 8 lines, plus an unlimited number of softphones running on computers and laptops and smartphones. This compared favourably to proprietary PBX technology especially as VoIP cordless was far cheaper than PBX cordless. Cisco also released the SPA112, an Analog Telephone Adapter (ATA) to connect one or two standard RJ-11 telephones to an Ethernet, in November 2011, retailing for under US$50. This was a competitive response to major cordless vendors such as Panasonic moving into the business VoIP cordless market Cisco had long dominated, as it suppressed the market for the cordless makers' native VoIP phones and permitted Cisco to argue the business case to spend more on switches and less on terminal devices. However, this solution would not permit the analog phones to access every line of a multi-line PBX, only one hardwired line per phone. As of late 2011, most cellular data networks were still extremely high latency and effectively useless for VoIP. IP-only providers such as Voipstream had begun to serve urban areas, and alternative approaches such as OpenBTS (open source GSM) were competing with mobile VoIP What is voip? Voice over IP (VoIP) is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone. VoIP Basics Now let's talk about the requirements. To make a VoIP call you will need the following: • Internet network VoIP works with any type of Internet access such as Dial-up, DSL/Cable broadband, Dedicated, Wi-FI and WiMax networks. Tip a single line requires 18.3 Kbps download and upload speed. You can check how fast your Internet is with VoIP speed test tool. The faster connection you have the better voice quality you enjoy. • A VoIP software or hardware o VoIP Soft-Phone - a dialer software that you download on your computer or laptop. Whenever you want to make Pc-to-Pc or Pc-to-Phone calls you got to have a software application. The above first and second diagrams show you running a soft-phone application on desktop computer. o Hard Phone - Examples of hard phones are ATA, Gateway, IP-Phone, VoIP routers and many others types. Check VoIP devices article for more details. • VoIP Phone Service Provider : VoIP provider is also known as ITSP (Internet Telephony Service Provider and Internet phone company. There are small, medium and carrier sized providers. Majority of them will provide the following VoIP services: o Internet to phone- we already mentioned this above. You can also read Pc- to-phone calls article to understand more.
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