voice over internet protocol (voip)2014
Post on 13-May-2017
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Voice over Internet Protocol (VoIP)
Elaborated by :Raed AMMARMarouen ARFAOUI
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Plan
• Introduction• VoIP definition• Architecture• VoIP Protocols• VoIP Security• Future of VoIP• Conclusion
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Introduction
Problem:
• Reduce the communication cost within enterprises
Solution:
• Communicate using the internet
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VoIP definition
Voice over IP (VoIP) is the process of sending an audio signal (usually voice) over a network using internet protocol.
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Architecture
How it works?
To implement voip, we need some equipments:• IPBX• VOIP server• VOIP client• Gateway
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Architecture
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Architecture
PBX
PBX (Private Branch Exchange) is a system that links individual telephones to telephone lines and external mobile networks.
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Architecture
IPBX
Private telephone exchange using the Internet Protocol (IP) to manage telephone calls from a company in its internal local area network (LAN)
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Architecture
VOIP ServerThey can now act as IPBX Systems and connect the clients connected
The ways to get this service are:- Use a service on the internet- Buy a physic equipment- Use a software (Asterisk, Elastix)
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Architecture
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Architecture
VOIP Client
There we have softphones and headphones:
• Softphones are computers that looks as telephones used for VOIP communication
• Headphones are software that can be installed in a computer, or a PDA that allows the device to use the VOIP
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Architecture
General Softphone clients :
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Architecture
GatewayEquipment used to connect the VOIP system to a real telephone lineIt is used in enterprises to call distant branches
It can also connect different type of communication infrastructures (Skype to SIP, SIP to telephone, telephone to SKYPE)
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VoIP Protocols
• H.323 or SIP• RTP, RTCP, RSVP, RTSP• Transport Layer (UDP, TCP)• Network Layer (IP, IP Multicast)• Data Link Layer• Physical Layer
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VoIP Protocols
• Call Manager / SoftwareApplication• CodecsPresentation• SIP/ H323Session• RTP/ UDP/ TCPTransport• IPNetwork
Data Link
Physical
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VoIP Protocols
H.323 is a multimedia standard that provides a foundation to transport voice, video and data with a concern for real-time data.
H.323 defines several network elements:• Terminals (LAN Endpoints)• Gateways (Optional but really useful)• Gatekeepers (Also optional)
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VoIP Protocols
SIP (Session Initiation Protocol) is an application-layer protocol for creating, modifying and terminating VoIP sessions.
Allows registration, authentication, initialization and call control. It also allows the negotiation on how to encode information was exchanged.
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VoIP Protocols
Transport Protocols (RTP / RTCP)
RTP (Real_Time Transport Protocol) aims to provide a uniform way to transmit IP data subject to constraints of real-time beginning to end, (audio or video streams) .Integrated with RTP, RTCP (Real Time Transport Control Protocol) allows you to have information on the quality of the data transmitted.
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VoIP Security
VoIP Security Issues:• Interception of calls• Denial of Service Attacks• Theft of Service• Exfiltration of data via media session• Malware embedded in signaling and media
session
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VoIP SecurityEnsure Secure VoIP
• Encrypt VoIP traffic • Properly configure firewalls. • Consider segmenting voice and data traffic by using
a virtual LAN. • Use proxy servers in front of corporate firewalls to
process incoming and outgoing voice data.• Make sure that server based IP PBXs are locked down
and protected against viruses and DoS attacks.
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Future of VoIP
Regulation:
Regulation and taxing can define the future of VoIP
Network Convergence:• The future is Triple Play! Voice, Video, and Data• Big competitors are Hybrid Fiber-Coax (cable
companies), and Fiber to the Home (phone companies)
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Conclusion
VoIP technology will be the trend of future. Already, more than 50 million people and businesses have begun to subscribe to a VoIP phone provider
Achievement
Questions??
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