logging in or signing up Voice over internet protocol (VoIP) we60 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 7399 Category: Science & Tech.. License: All Rights Reserved Like it (9) Dislike it (0) Added: January 15, 2009 This Presentation is Public Favorites: 3 Presentation Description This is a short presenaion on VoIP basics most of the material has been taken from www.howstuffworks.com Comments Posting comment... By: we60 (6 month(s) ago) http://www.mindfiresolutions.com/mindfire/Technical_Voice_ov.. Saving..... Post Reply Close Saving..... Edit Comment Close By: gabru_guy86 (17 month(s) ago) thnx ,, Saving..... Post Reply Close Saving..... Edit Comment Close By: sahilboni (23 month(s) ago) nixce presentation..helped a lot Saving..... Post Reply Close Saving..... Edit Comment Close By: agnipaul (33 month(s) ago) your presentation has helped me big. thank u for helping me do my presentation on voip. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript VOIP TECHNOLOGY- THE NEXT STEP IN GLOBAL COMMUNICATIONS : VOIP TECHNOLOGY- THE NEXT STEP IN GLOBAL COMMUNICATIONS SUSMITA MITRA SCS Delhi NUES Presentation on: Voice Over Internet Protocol 16-17 April 2008 Talk Overview : Talk Overview Introduction Using VoIP VoIP- Packet Switching Major concerns of VoIP CODECS VoIP: Soft Switches and Protocols VoIP: Quality of service : What is VOIP? Voice over Internet Protocol (VoIP) is a technology that enables one to make and receive phone calls through the Internet instead of using the traditional analog PSTN (Public Switched Telephone Network) lines. Call anyone in the world at unbelievably low rates Why VoIP? : Why VoIP? Can make and receive calls with / without a computer Can surf the net while making calls Can make local / long distance calls Can make and receive call to / from PSTN Cost effective Digital features not commonly available on PSTN lines such as : v o i c e m a i l , c a l l e r I D , c o n f e r e n c e a n d s o o n. Flavors of VoIP : Flavors of VoIP ATA Connects a standard phone to a computer or an Internet connection for use with VoIP. The ATA is an analog-to-digital converter. IP Phones connect directly to a router and have all the hardware and software necessary right onboard to handle the IP call. Computer-to-computer There are several companies offering free or very low-cost software that you can use for this type of VoIP. All you need is the software, a microphone, speakers, a sound card and an Internet connection How does VoIP work? : How does VoIP work? VoIP converts the voice signal from your telephone into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is then converted back at the other end. Internet Voice can allow you to make a call directly from a personal computer. If you make a call using a phone with an adaptor, you’ll be able to dial just as you always have. : The users voice (or fax) is converted into a digital signal, compressed, and broken down into a series of packets. The packets are then transported over private or public IP networks and reassembled and decoded on the receiving side. At the receiving end, the re-assembled packets arrive as a normal sounding voice call. Packet switching is very efficient. It lets the network route the packets along the least congested and cheapest lines. It also frees up the two computers communicating with each other so that they can accept information from other computers, as well. PACKET SWITCHING CHALLENGES : CHALLENGES Some VoIP service providers may have limitations to their 911 service. Some VoIP services don’t work during power outages VoIP is susceptible to worms, viruses and hacking. Because VoIP uses an Internet connection, it's susceptible to all the hiccups normally associated with home broadband services. All of these factors affect call quality: Latency Jitter Packet loss Phone conversations can become distorted, garbled or lost because of transmission errors. Slide 9: V o I P – C O D E C S A codec, which stands for coder-decoder, converts an audio signal into compressed digital form for transmission and then back into an uncompressed audio signal for replay. It's the essence of VoIP. Codecs sample the audio signal several thousand times per second. Summary of available codecs: VoIP software processes and routes the calls. Soft Switches and Protocols : Soft Switches and Protocols Soft Switches- where to send data? It contains a database of users and phone numbers. If it doesn't have the information it needs, it hands off the request downstream to other soft switches until it finds one that can answer the request. VoIP-Protocols:- H.323 - ITU-Standard initially a multimedia conferencing protocol. Defines all aspects of call transmission, from call establishment to capabilities exchange to network resource availability. SIP - IETF’s standard for establishing VOIP connections. Defines how sessions are to be set up and torn down. Q o s - i n V o I P : Q o s - i n V o I P Quality of Service is essential for the success of VoIP. The human ear is extremely sensitive to even minor changes in an audio signal. Loss of quality occurs when the voice packets are transferred over the inherently unreliable packet-based networks. Q o s - i n V o I P : Some methods to enhance the QoS achieved in VoIP are: Classification of Service: Using the TOS bits in the IP header to set a priority for the voice packet. Tagging the packets with labels and using the labels to decide the route. Voice packets can be routed over less congested networks. Reserving resources to meet requirements for bandwidth, delay, jitter, etc. along a particular path through a series of routers. Q o s - i n V o I P CREDITS : CREDITS http://communication.howstuffworks.com/ip-telephony.htm http://www.fcc.gov/voip/ http://www.discover-voip.info/branded-voip/branded-voip.html http://www.packetizer.com/ipmc/papers/understanding_voip/hype_vs_reality.html You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Voice over internet protocol (VoIP) we60 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 7399 Category: Science & Tech.. License: All Rights Reserved Like it (9) Dislike it (0) Added: January 15, 2009 This Presentation is Public Favorites: 3 Presentation Description This is a short presenaion on VoIP basics most of the material has been taken from www.howstuffworks.com Comments Posting comment... By: we60 (6 month(s) ago) http://www.mindfiresolutions.com/mindfire/Technical_Voice_ov.. Saving..... Post Reply Close Saving..... Edit Comment Close By: gabru_guy86 (17 month(s) ago) thnx ,, Saving..... Post Reply Close Saving..... Edit Comment Close By: sahilboni (23 month(s) ago) nixce presentation..helped a lot Saving..... Post Reply Close Saving..... Edit Comment Close By: agnipaul (33 month(s) ago) your presentation has helped me big. thank u for helping me do my presentation on voip. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript VOIP TECHNOLOGY- THE NEXT STEP IN GLOBAL COMMUNICATIONS : VOIP TECHNOLOGY- THE NEXT STEP IN GLOBAL COMMUNICATIONS SUSMITA MITRA SCS Delhi NUES Presentation on: Voice Over Internet Protocol 16-17 April 2008 Talk Overview : Talk Overview Introduction Using VoIP VoIP- Packet Switching Major concerns of VoIP CODECS VoIP: Soft Switches and Protocols VoIP: Quality of service : What is VOIP? Voice over Internet Protocol (VoIP) is a technology that enables one to make and receive phone calls through the Internet instead of using the traditional analog PSTN (Public Switched Telephone Network) lines. Call anyone in the world at unbelievably low rates Why VoIP? : Why VoIP? Can make and receive calls with / without a computer Can surf the net while making calls Can make local / long distance calls Can make and receive call to / from PSTN Cost effective Digital features not commonly available on PSTN lines such as : v o i c e m a i l , c a l l e r I D , c o n f e r e n c e a n d s o o n. Flavors of VoIP : Flavors of VoIP ATA Connects a standard phone to a computer or an Internet connection for use with VoIP. The ATA is an analog-to-digital converter. IP Phones connect directly to a router and have all the hardware and software necessary right onboard to handle the IP call. Computer-to-computer There are several companies offering free or very low-cost software that you can use for this type of VoIP. All you need is the software, a microphone, speakers, a sound card and an Internet connection How does VoIP work? : How does VoIP work? VoIP converts the voice signal from your telephone into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is then converted back at the other end. Internet Voice can allow you to make a call directly from a personal computer. If you make a call using a phone with an adaptor, you’ll be able to dial just as you always have. : The users voice (or fax) is converted into a digital signal, compressed, and broken down into a series of packets. The packets are then transported over private or public IP networks and reassembled and decoded on the receiving side. At the receiving end, the re-assembled packets arrive as a normal sounding voice call. Packet switching is very efficient. It lets the network route the packets along the least congested and cheapest lines. It also frees up the two computers communicating with each other so that they can accept information from other computers, as well. PACKET SWITCHING CHALLENGES : CHALLENGES Some VoIP service providers may have limitations to their 911 service. Some VoIP services don’t work during power outages VoIP is susceptible to worms, viruses and hacking. Because VoIP uses an Internet connection, it's susceptible to all the hiccups normally associated with home broadband services. All of these factors affect call quality: Latency Jitter Packet loss Phone conversations can become distorted, garbled or lost because of transmission errors. Slide 9: V o I P – C O D E C S A codec, which stands for coder-decoder, converts an audio signal into compressed digital form for transmission and then back into an uncompressed audio signal for replay. It's the essence of VoIP. Codecs sample the audio signal several thousand times per second. Summary of available codecs: VoIP software processes and routes the calls. Soft Switches and Protocols : Soft Switches and Protocols Soft Switches- where to send data? It contains a database of users and phone numbers. If it doesn't have the information it needs, it hands off the request downstream to other soft switches until it finds one that can answer the request. VoIP-Protocols:- H.323 - ITU-Standard initially a multimedia conferencing protocol. Defines all aspects of call transmission, from call establishment to capabilities exchange to network resource availability. SIP - IETF’s standard for establishing VOIP connections. Defines how sessions are to be set up and torn down. Q o s - i n V o I P : Q o s - i n V o I P Quality of Service is essential for the success of VoIP. The human ear is extremely sensitive to even minor changes in an audio signal. Loss of quality occurs when the voice packets are transferred over the inherently unreliable packet-based networks. Q o s - i n V o I P : Some methods to enhance the QoS achieved in VoIP are: Classification of Service: Using the TOS bits in the IP header to set a priority for the voice packet. Tagging the packets with labels and using the labels to decide the route. Voice packets can be routed over less congested networks. Reserving resources to meet requirements for bandwidth, delay, jitter, etc. along a particular path through a series of routers. Q o s - i n V o I P CREDITS : CREDITS http://communication.howstuffworks.com/ip-telephony.htm http://www.fcc.gov/voip/ http://www.discover-voip.info/branded-voip/branded-voip.html http://www.packetizer.com/ipmc/papers/understanding_voip/hype_vs_reality.html