VOIP is a technology that allows users to make phone calls over the Internet instead of traditional phone lines. It encodes audio and video into digital signals that can be transmitted over broadband connections. While VOIP offers lower costs and additional features compared to traditional phone service, it also faces disadvantages like potential service disruptions during power outages and difficulties tracing emergency calls. The document discusses the history and workings of VOIP, compares it to traditional phone systems, and provides examples of hospitals adopting VOIP technologies.

1. VOICE OVER IP

2. Abstract
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 analogy PSTN (Public
Switched Telephone Network) lines.

3. INTRODUCTION
• Encode audio & video with audio codes & video codes
• It allows 2 way voice transmission over broad band connection
• VoIP started with company called vocal tec in 1995
• The scope of communication
Pc to pc
Pc to phone
Phone to phone
Ip phone to phone
Ip phone to Ip phone

4. DIFFERENCE BETWEEN VOIP & PSTN
•VOIP
• All channels carried over one Internet connection
• Features such as call waiting, Caller ID and so on
are usually included free with service
• Upgrades usually requires only bandwidth and
software upgrades
• Long distance is often included in regular monthly
price
• Lose power, lose phone service without power
backup in place
• 911 emergency calls cannot always be traced to a
specific geographic location
•PSTN(Public Switched Telephone Network)
• Dedicated Lines
• Features such as call waiting, Caller ID and so on
are usually available at an extra cost
• Can be upgraded or expanded with new
equipment and line provisioning
• Long distance is usually per minute or bundled
minute subscription
• Hardwired landline phones (those without an
adapter) usually remain active during power
outage
• When placing a 911 call it can be traced to your
location

7. Source :-https://secure.skype.com/en/calling-rates?expo365=empty

9. FUTURE OF VOIP
• Continued growth is expected inVoIP service
• Strong performance from market competitors

10. ADVANTAGES
• Lower call Cost
• Phone line Installation
•Voice Quality
• Mobility

11. DISADVANTAGES
• Power Outages/ Emergencies
• Latency
• Difficult to trace a call

12. Case study
NORTH CAROLINA HOSPITAL
– Use of intercom system
– Eliminated use of intercom system
– Rolling out a wireless handset
– Efficiency amongst nurses
Source:- http://www.med.unc.edu

13. Case study
INDIANA UNIVERSITY
– Old-school voice-messaging system
– Different handsets for Voice message and Email
– Adapting VOIP system
Source:- http://www.stateuniversity.com

14. CONCLUSION
• low cost alternative for communication.
• companies that depend on international communication are
making use of such services in order to lower their operational cost.
• With all of the improvements continually going on withVOIP, it will soon
be accepted by everyone as an alternative to PSTN