SEMINAR ONVoice Over IP (VoIP): Internet Telephony Presented By KUMAR GAURAV MMMEC
CONTENTS Introduction Voice Over IP Overview VoIP routing scheme VoIP Technologies VoIP implementation Power of VoIP Benefits of VoIP Disadvantages of VoIP Conclusion
INTRODUCTION Voice over Internet Protocol (VoIP) is a transmission technology for delivery of voice communications over IP networks. Internet telephone call are conversion of the analog voice signal to digital format and compression/translation of the signal into Internet protocol packets. VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs. With VoIP, we can make a call from anywhere we have broadband connectivity.
What is VoIP? Telephone Service as we know it, today… • Click to edit Master text styles• Click to edit Master text styles – Second level – Second level Telco PSTN, – Third level • Fourth level CO Switch – Third level – Fifth level • Fourth level – Fifth level Evolution IP Network LAN or WAN, Router IP Telephone IP Telephone
Voice Over IP OverviewVoIP is an emerging technology that allows voice calls to be made over an IPnetwork. Vendors have been pushing VoIP for a few years, but many potentialcustomers have been waiting for “better” call quality, or believe that nothing is free.If applied and configured correctly, a VoIP solution can provide excellent callquality, and tremendous financial savings to both large and small organizations. The Key to implementing a successful VoIP solution is to Identify opportunities that fit.
Analog and Digital Voice Circuits• Analog Circuit – Referred to as a line – Unit by which capacity is typically measured – A residential line or a 1FB (Feature Group - Business) – Bandwidth is typically between 300 Hz and 3 KHz – Voice traffic is carried as a waveform• Digital Circuit – Analog voice traffic that has been “digitized” (converted to bits) for ease of transport – Bandwidth is typically 1.544Mbps – Voice traffic is carried as a stream of bits
Analog to Digital Conversion Bit 1 Bit 2 Bit 3 8-Bit Sample @ Bit 4 8 KHz/Sec Bit 5*External microphone Analog to Digital Converter Bit 6in use! Bit 7 Bit 8 Serial Transmission Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 64 Kbps
VoIP Voice Protocols• VoIP uses two common protocols to carry your voice message – User Datagram Protocol (UDP) – Real-Time Protocol (RTP) IP UDP RTP Data VoIP Packet
VoIP technologiesVoIP is a revolutionarytechnology that has thepotential to completely rework H.323the worlds phone systems. IMSTechnologies used to implement SIPVoice over Internet Protocol RTPinclude:
How VoIP WorksEXT 101 places a call to ext 201. PBX A sees ext 201 as the gateway and sendsthe call out to the GW. The GW compresses the voice and encapsulates it in anIP packet and sends it to the destination of the other GW. The GW on LAN B muststrip out the IP, decompress the voice and route it to PBX B.EXT 101 EXT 201 IP Network GW router router GWPBX A PBX B LAN A LAN B
VoIP Application Branch Office #1, FL• Allows Toll By-Pass via FR Network• Local dial tone at remote office PBX• 3 digit extension dialing between offices FR Network Digital Handsets Ericsson Webswitch 2000 Branch Office #2, TX PBX Main Office, CA PBX Digital Handsets Digital Handsets Frame Relay Connection
VoIP Application Telecommuter• Toll By-Pass via Internet PC• Analog phones appear as extensions on WS200 Analog Phone DSLCable WS 100 connection Analog FAX Internet Webswitch 2000 Telecommuter Main Office, CA PC PBX Analog Phone WS 100 Analog FAX Digital Handsets T1 Internet connection
The Power Of VoIPVoIP has become a powerful force in telecommunications due toseveral reasons. cheaper than PSTN service providers compatible with web-based applications enabling the user to change, adjust , or listen to these features over the Internet. Long distance is usually provided free of charge. Call Waiting Voice Mail Caller Id Features Call Transfer Call Forwarding
Benefits of VoIP• Easy Deployment and Reconfiguration Management• Cost Savings: Hardware, Maintenance, Toll Charges• Improved Mobility, Changing of Offices, Phone Numbers• Convergence of Services, such as Conferencing• Compared to TDM Phones, VoIP Phones offer – More Flexibility – More Features This Equates to Corporate Productivity Enhancement
Disadvantages of Using VoIP VoIP is dependent on wall power. No way to integrate these products with VoIP. No way to associate a geographical location with an IP address. It’s susceptible to all the hiccups normally associated with home broadband services. Phone conversations can become distorted, garbled or lost because of transmission errors. VoIP is susceptible to worms,viruses and hacking. VoIP is having a phone system dependant on individual PCs of varying specifications and power.
Conclusion VoIP is a prospering technology that enables users to place phone calls over internet. By taking advantages of VoIP specific characteristics, our approach can detect quality problems network failures faster and with less overhead than existing approaches. VoIP has become a popular method of hiring with outsourcing. VoIP is able to provide faster problem of recovery with less overhead than existing approaches.