Anup Kawtia- A Presentation On Voip
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A PRESENTATION ON VOIP
BY: ANUP KAWTIA 0501206124 COMP SC. & ENGG. 10 September 2008
A PRESENTATION ON VOIP
1
CONTENTS • • • • • • • • • • • 10 September 2008
Introduction How it works? Types Clients Protocols VOIP Service- Features VOIP vs. PSTN Advantages Disadvantages VoIP Subscribers worldwide VOIP Service- Providers A PRESENTATION ON VOIP
2
Introduction What is Voice Over Internet Protocol (VOIP) ? • The ability to make phone calls over IP-based data network. • The method of digitizing voice, encapsulating the digitized voice into packets and transmitting those packets over a packet switched IP network. • The multi-billion revenue opportunity for the 21st century.
10 September 2008
A PRESENTATION ON VOIP
3
How VOIP works? • Conversion of the analog voice signal to digital format • Compress signal Internet protocol (IP) packets for transmission over the internet • Transmit • Conversion of the digital signal back to analog
IP Network
10 September 2008
A PRESENTATION ON VOIP
4
VOIP Types • PC- to- PC VOIP • PC- to- Phone VOIP • Phone- to- Phone VOIP
10 September 2008
A PRESENTATION ON VOIP
5
PC- to- PC VOIP • Voice Communication between PCs connected to the Internet. • Needs PC users online simultaneously. • Needs a PC with sound card, microphone and same software such as MS NetMeeting at both ends. • Only costs of Internet access is involved. • No need of Gateway on either side.
Internet Modem
10 September 2008
Central Office
Central Office
A PRESENTATION ON VOIP
Modem
6
PC- to- Phone VOIP • Voice communication from PC on one end to phone on PSTN via gateway on the other. • Needs gateway on the phone side to convert IP packets back to telephone signals. • Gateway located as near to the callee to minimize the price for the gateway-to-callee connection. • The cost to caller is charged by gateway operator and is determined by the call placed from the gateway to the callee. Gatekeeper
Internet
Modem
10 September 2008
Central Office
VoIP Gateway
A PRESENTATION ON VOIP
Centra l Office 7
Phone- to- Phone VOIP • Needs two gateways, one to convert circuit switched signals to packet switched signals and the other to perform reverse action. • Allows consumers to place phone calls using just their ordinary home phones; No additional hardware, software, or Internet connectivity required. • Cost Involved • Local Call cost • Cost Charged by Gateway Operators Gatekeeper
VoIP Central Gateway Office
IP
VoIP Gateway Central Office
VoIP Service Provider
10 September 2008
A PRESENTATION ON VOIP
8
VOIP Clients • Analog Telephone Adaptor
• VOIP Phones
• Wireless VOIP Phones
• VOIP Soft Phones
10 September 2008
A PRESENTATION ON VOIP
9
VOIP Protocols • H.32 3 • Handles voice, video, and data conferencing • Most VoIP traffic utilises this today • Se ssion Ini tiati on P ro tocol (SI P) • Signaling protocol • Currently most favoured protocol for new systems • Rea ltime T ra nsp or t Pr oto co l (RT P) • Transport protocol • Fast, scaleable and efficient • Me dia G atewa y Co ntr ol Pr ot oco l (MG CP) • Signaling and control protocol • Reduces traffic between gateways 10 September 2008
A PRESENTATION ON VOIP
10
VOIP Service- Features • • • • • • • • • •
Call forwarding Call hold Call waiting Calling Line Identification (CLIP) . Directories—missed, placed, received calls list Message waiting indication Hands-free, full-duplex speakerphone Speed dial—multiple speed dials per phone Station volume controls (audio, ringer) Recent dial list—calls to phone, calls from phone, auto-dial, and edit dial • Multi-party conferencing
10 September 2008
A PRESENTATION ON VOIP
11
VOIP vs. PSTN Network Features
PSTN
VOIP
Switch
Circuit Switched
Packet Switched
Connection
Connection Oriented
Connectionless
Bit Rate
Fixed and low <=64kb/s Cannot
Wide variation to Gb/s Can be done very fast Can be high and varying
Info resending Delay
10 September 2008
Must be low and stable
A PRESENTATION ON VOIP
12
Advantages of VOIP • • • • •
Cost Reduction More Bandwidth Integration of Voice and Data network Network Efficiency Easily Portable
10 September 2008
A PRESENTATION ON VOIP
13
Disadvantages of VOIP • The Quality of Service: • Delays • Jitter • Packet Loss • High Speed Internet • Power Outage • 911 Services • Directory Assistance
10 September 2008
A PRESENTATION ON VOIP
14
VoIP Subscribers worldwide
10 September 2008
A PRESENTATION ON VOIP
15
VOIP Service- Providers • iBase • Teleglobe • Vonage • Skype • Lingo • EarthLink • Pulver • Google 10 September 2008
A PRESENTATION ON VOIP
16
Conclusion • Must be clear that VoIP is indeed cost-effective. • Protect its investment in circuit switched telecom operations since VoIP would be complementary to its existing technology • There must be significantly lower total cost of operation compared to today’s PSTN • Technology is not fully developed to the point where it can replace the services and quality provided by PSTN • Service Providers are awaiting the development of the remaining pieces of technology that will ensue quality transport in the last mile
10 September 2008
A PRESENTATION ON VOIP
17
References • www.google.co.in • www.wikipedia.org
10 September 2008
A PRESENTATION ON VOIP
18
Thanks for your kind attention! Thank you
Questions are welcome!
10 September 2008
A PRESENTATION ON VOIP
19
BY: ANUP KAWTIA 0501206124 COMP SC. & ENGG. 10 September 2008
A PRESENTATION ON VOIP
1
CONTENTS • • • • • • • • • • • 10 September 2008
Introduction How it works? Types Clients Protocols VOIP Service- Features VOIP vs. PSTN Advantages Disadvantages VoIP Subscribers worldwide VOIP Service- Providers A PRESENTATION ON VOIP
2
Introduction What is Voice Over Internet Protocol (VOIP) ? • The ability to make phone calls over IP-based data network. • The method of digitizing voice, encapsulating the digitized voice into packets and transmitting those packets over a packet switched IP network. • The multi-billion revenue opportunity for the 21st century.
10 September 2008
A PRESENTATION ON VOIP
3
How VOIP works? • Conversion of the analog voice signal to digital format • Compress signal Internet protocol (IP) packets for transmission over the internet • Transmit • Conversion of the digital signal back to analog
IP Network
10 September 2008
A PRESENTATION ON VOIP
4
VOIP Types • PC- to- PC VOIP • PC- to- Phone VOIP • Phone- to- Phone VOIP
10 September 2008
A PRESENTATION ON VOIP
5
PC- to- PC VOIP • Voice Communication between PCs connected to the Internet. • Needs PC users online simultaneously. • Needs a PC with sound card, microphone and same software such as MS NetMeeting at both ends. • Only costs of Internet access is involved. • No need of Gateway on either side.
Internet Modem
10 September 2008
Central Office
Central Office
A PRESENTATION ON VOIP
Modem
6
PC- to- Phone VOIP • Voice communication from PC on one end to phone on PSTN via gateway on the other. • Needs gateway on the phone side to convert IP packets back to telephone signals. • Gateway located as near to the callee to minimize the price for the gateway-to-callee connection. • The cost to caller is charged by gateway operator and is determined by the call placed from the gateway to the callee. Gatekeeper
Internet
Modem
10 September 2008
Central Office
VoIP Gateway
A PRESENTATION ON VOIP
Centra l Office 7
Phone- to- Phone VOIP • Needs two gateways, one to convert circuit switched signals to packet switched signals and the other to perform reverse action. • Allows consumers to place phone calls using just their ordinary home phones; No additional hardware, software, or Internet connectivity required. • Cost Involved • Local Call cost • Cost Charged by Gateway Operators Gatekeeper
VoIP Central Gateway Office
IP
VoIP Gateway Central Office
VoIP Service Provider
10 September 2008
A PRESENTATION ON VOIP
8
VOIP Clients • Analog Telephone Adaptor
• VOIP Phones
• Wireless VOIP Phones
• VOIP Soft Phones
10 September 2008
A PRESENTATION ON VOIP
9
VOIP Protocols • H.32 3 • Handles voice, video, and data conferencing • Most VoIP traffic utilises this today • Se ssion Ini tiati on P ro tocol (SI P) • Signaling protocol • Currently most favoured protocol for new systems • Rea ltime T ra nsp or t Pr oto co l (RT P) • Transport protocol • Fast, scaleable and efficient • Me dia G atewa y Co ntr ol Pr ot oco l (MG CP) • Signaling and control protocol • Reduces traffic between gateways 10 September 2008
A PRESENTATION ON VOIP
10
VOIP Service- Features • • • • • • • • • •
Call forwarding Call hold Call waiting Calling Line Identification (CLIP) . Directories—missed, placed, received calls list Message waiting indication Hands-free, full-duplex speakerphone Speed dial—multiple speed dials per phone Station volume controls (audio, ringer) Recent dial list—calls to phone, calls from phone, auto-dial, and edit dial • Multi-party conferencing
10 September 2008
A PRESENTATION ON VOIP
11
VOIP vs. PSTN Network Features
PSTN
VOIP
Switch
Circuit Switched
Packet Switched
Connection
Connection Oriented
Connectionless
Bit Rate
Fixed and low <=64kb/s Cannot
Wide variation to Gb/s Can be done very fast Can be high and varying
Info resending Delay
10 September 2008
Must be low and stable
A PRESENTATION ON VOIP
12
Advantages of VOIP • • • • •
Cost Reduction More Bandwidth Integration of Voice and Data network Network Efficiency Easily Portable
10 September 2008
A PRESENTATION ON VOIP
13
Disadvantages of VOIP • The Quality of Service: • Delays • Jitter • Packet Loss • High Speed Internet • Power Outage • 911 Services • Directory Assistance
10 September 2008
A PRESENTATION ON VOIP
14
VoIP Subscribers worldwide
10 September 2008
A PRESENTATION ON VOIP
15
VOIP Service- Providers • iBase • Teleglobe • Vonage • Skype • Lingo • EarthLink • Pulver • Google 10 September 2008
A PRESENTATION ON VOIP
16
Conclusion • Must be clear that VoIP is indeed cost-effective. • Protect its investment in circuit switched telecom operations since VoIP would be complementary to its existing technology • There must be significantly lower total cost of operation compared to today’s PSTN • Technology is not fully developed to the point where it can replace the services and quality provided by PSTN • Service Providers are awaiting the development of the remaining pieces of technology that will ensue quality transport in the last mile
10 September 2008
A PRESENTATION ON VOIP
17
References • www.google.co.in • www.wikipedia.org
10 September 2008
A PRESENTATION ON VOIP
18
Thanks for your kind attention! Thank you
Questions are welcome!
10 September 2008
A PRESENTATION ON VOIP
19
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