This document discusses Voice over Internet Protocol (VoIP). It begins with an overview of how traditional telephone networks worked and have evolved to use Internet Protocol. The key protocols and standards used in VoIP like SIP, RTP are explained. The different modes of VoIP like PC-to-PC, PC-to-phone and phone-to-phone are outlined. Advantages of VoIP like cost savings and rich media services are contrasted with disadvantages such as dependence on internet connectivity. Challenges in providing quality of service, addressing delays and security issues with VoIP are also highlighted.
VoIP is one of a family of internet technologies and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks.
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a seminar paper presentation .this will help you know about voice transmission over the internet protocol's.as in Skype, watts app. it also give an idea about old technology. thanks. if any mistakes ,and add any updates and share with me .on about this slide
VoIP is one of a family of internet technologies and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks.
FB: https://www.facebook.com/mstfahsin
a seminar paper presentation .this will help you know about voice transmission over the internet protocol's.as in Skype, watts app. it also give an idea about old technology. thanks. if any mistakes ,and add any updates and share with me .on about this slide
Voice over Internet Protocol (VoIP), is a technology that allows to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line (PSTN).
Practical Fundamentals of Voice over IP (VoIP) for Engineers and TechniciansLiving Online
In the past five years, technologies have converged to such an extent that one can transmit voice, fax and video over the same internet protocol network that one uses for data. This workshop examines Voice over IP (VoIP) technologies and provides you with the skills to competently implement a VoIP network for your organisation. Numerous case studies and exercises throughout the course ensure that you get a good grasp on the technologies used. Solid practical advice is given on application, implementation and most importantly troubleshooting these systems.
MORE INFORMATION: http://www.idc-online.com/content/practical-fundamentals-voice-over-ip-voip-engineers-and-technicians-3
What is VoIP? 4. What is VoIP? VoIP = “Voice over Internet Protocol”. Basically, VoIP means Voice transmitted over a Digital Network”. Also called IP Telephony.
Voice over Internet Protocol (VoIP), is a technology that allows to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line (PSTN).
Practical Fundamentals of Voice over IP (VoIP) for Engineers and TechniciansLiving Online
In the past five years, technologies have converged to such an extent that one can transmit voice, fax and video over the same internet protocol network that one uses for data. This workshop examines Voice over IP (VoIP) technologies and provides you with the skills to competently implement a VoIP network for your organisation. Numerous case studies and exercises throughout the course ensure that you get a good grasp on the technologies used. Solid practical advice is given on application, implementation and most importantly troubleshooting these systems.
MORE INFORMATION: http://www.idc-online.com/content/practical-fundamentals-voice-over-ip-voip-engineers-and-technicians-3
What is VoIP? 4. What is VoIP? VoIP = “Voice over Internet Protocol”. Basically, VoIP means Voice transmitted over a Digital Network”. Also called IP Telephony.
Voice over Internet Protocol with Novel Applicationsirjes
Internet Telephony, often denoted as Voice-over-Internet-Protocol (VoIP), has gained more and
more attention world-wide during the last decades. Voice over Internet Protocol (VoIP) technology has become
a communication alternative with the continuous increasing of Internet bandwidth and rapid advancement of
peer-to-peer (P2P) applications.In this paper three types of VOIP are explained: (i) PC to PC : this is the easiest
way to use VOIP, which enables you to talk and communicate Voice over Internet with all people over the
world. (ii) PC to Phone: which need a gateway that connects IP Network to phone Network. Its uses a device
called an ATA (Analogue Telephone Adaptor).The ATA allows you to connect a standard phone to your
computer or your Internet connection for use with VOIP. The ATA is an analogue to digital converter. (iii)
Phone to Phone: Where you need more gateways that connect IP network to phone networks, more phone
networks that connect Telephone set to gateway, and IP network that connect gateway to gateway. This paper
also explains Internet Protocol (IP) that VOIP uses to transmit voice as packets over an IP network as follows:
H.323 Protocols that provides the technical requirements for voice communication over LANs, while assuming
that Quality of Service isn't provided by LANs. Session Initiation Protocol (SIP) standard which is the standard
for establishing VOIP connections. This paper also explores Voice XML which is a markup language derived
from XML for writing telephone-based speech applications.In this paper also VoiceXML developed
environments(Gateways) are explained, where a list of all VoiceXML developers is included, and the most
popular VoiceXML development environments (Gateways) are explained in details.Finally, in this paper ten
VoiceXML applications are developed
Internet protocol (VoIP) is the technology of digitizing sound, compressing it, breaking it up into data packets, and sending it over an IP network.The conventional technique used for sending voice is PSTN (public switched telephone network) . As data traffic has higher speed than telephone traffic, so what we do most of the time we prefer to send voice over data networks. Voice over internet protocol (VoIP) is a method of telephone communication over a data network.
Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service.
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VoIP
1. Voice over Internet
Protocol
BE E&TC, GHRCEM
Adnaan Ahmad, Vivek Amilkanthwar, Abhishek Pandey
Annay Baski & Chintamani Desai
2. AGENDA
• Evolution of VoIP
• What is VoIP
• Protocols and signaling standards
• Modes of VoIP
• Advantages & Disadvantages
• Challenges
3. How Phones Used To Work
(pre - 1960)
• Phones were connected by a direct
physical line from 1 user to another
user.
• The line remained open for the entire
duration of the call.
• A call from Mumbai to New Delhi
required a large length of copper wire
connecting the 2 talkers.
12. Devices working on IP
• IP Devices send data as packets
• They receive phone numbers then determine if
the number is:
– soft phone
– hard phone
• If it a soft phone then an IP address is acquired,
otherwise the call will go through the VoIP
company’s phone network.
Cell Phones PCs
13. Comparison Example
• An important difference between the IP phones
and current phone services is the amount of
redundant data sent.
Jack
Jill
Jack
Jill
Hi Hi
How are
You?
How are
You?
Great!!! Great!!!
Current Phone Implementation IP Phones
14.
15. Overview of VoIP
Continuously sample
audio
Convert each sample to
digital form
Send digitized stream
across Internet in packets
Convert the stream back
to analog for playback
16. 16
Standers and Protocols
Audio is encoded using a well-known standard such
as Pulse Code Modulation (PCM)
Audio is transferred using the Real-time Transport
Protocol (RTP)
RTP message is encapsulated in a UDP datagram
that is further encapsulated in an IP datagram for
transmission.
19. Network Protocol Structure
for Internet Telephony
H.323 or SIP
RTP, RTCP, RSVP, RTSP
Transport Layer (UDP,
TCP)
Network Layer (IP, IP
Multicast)
Data Link Layer
20. ECE 499 VoIP 20
Session Initialization Protocol
• Invite - invites callee(s) to participate in a call
• ACK - Acknowledges the invitation
• Options - Inquires about media capabilities without
setting up a call
• Cancel - Terminates the invitation
• Bye - Terminates a Call
• Register - Sends users Location to a registrar
(a SIP server)
21. 1. Caller Sends INVITE adnaan@home.net
2. Proxy Uses DNS and sends request
3-4. adnaan@home.net isn't logged on request sent
to location server adnaan@work.net located
5. return adnaan@work.net to proxy server
6. attempt next proxy server
7- 8. consults location server to discover Adnaan's
local address adnaan.ahm@my.work.net
9- 10. Proxy 3 forwards the invitation to the callee
11-14. Adnaan accepts the call and returns
acknowledgment to caller
SIP Example
SIP
Client
Caller
Proxy
Server 1
Redirect
Server
Proxy
Server 2
Location
Server
Location
Server
SIP
Client
Callee
Proxy
Server 3
1 2
3
4
5
6 7
8
9
10
11
12
13
14
22. Modes of Internet Telephony
• PC-to-PC
• PC-to-Phone
• Phone-to-Phone
23. Case 1: PC to PC Connection
• Made over the internet for voice
connection
• Sample product:
– Net2Phone
– NetMeeting
• Calls are free
25. Procedure
Step 1: Download, install, and launch the
software.
Step 2: Log in or create an account.
Step 3: Add contacts.
Step 4: Make the call.
26. Case 2: PC to Phone Connection
• Made over the Internet for connecting PC
to phones
• Sample Product:
– Net2Phone
• Need to pay for the calls but they are
relatively inexpensive
– Cheaper compared to phone to phone calls
made over the Internet
27. Procedure
1. Download the software
2. Create a Username and Password
3. Select the amount of money you want to
add to your account
4. Login to the software
5. Make PC2Phone calls and send faxes.
30. Case 3: Phone to Phone Connection
• Phone to phone calls are made over the
Internet
• A special phone will connect to a hub or
switch on the network
33. Advantages
• Cost Saving: VoIP reduces cost of equipment, lines,
manpower and maintenance.
• Rich Media Service: People check out friends
presence, send instant messages, make voice or video
calls, transfer images.
• Phone Portability: The phone device can use the
same number virtually every where as long as it has
proper IP connectivity.
34. Disadvantages
• No Power No Phone: VoIP service requires a
broadband connection fed through the same power lines
as other electrical devices.
• Voice Quality: You may experience voice quality
problem such as delays or dropped calls.
• Security
35. Challenges in VoIP
oQuality of Service (QOS)
oVoice transmission delay
oCall setup: call establishment and
call termination
oIssue of Network Security
