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IPNetwork
IPNetwork
Telephone Network
Telephone Network
Broadcast Network
Broadcast Network
IPNetwork
IPNetwork
Storage Area
Network
Storage Area
Network
Voice Video Data Storage
Today’s Converged Networks© 2004 Cisco Systems, Inc. All rights reserved.Presentation_ID
Voice over IP (VoIP)
Traditional Call Centre Set Up
Call Centre Server
ACD/PBX
PSTN
Customer
CTI Interface
LAN
PBX Extensions
Agent StationsAgent Stations
ACD/PBX
What is VoIP?
VoIP let you make toll-free long distance voice and fax calls over existing IP data networks instead of public switched telephone network (PSTN).
VoIP solution can dramatically cut long distance call charges between two or more locations.
VoIP vs circuit networks
POTS (Plain Old Telephone Systems) used circuit switching techniques
Only 40-50% bandwidth used Cheaper cost Pay back period is short
Example of VoIP networks
PC (software) to PC (software) by home users
PC to phone Phone to Phone Inter Offices (across national/international)
Voice Traffic is Toll Free
VoIP services
Skype Vonage FreeWorldDialup Brekeke Yourself !
Equipment needed
An IP Network VoIP Server PC with VoIP software or VoIP phone VoIP adapter
VoIP protocols
Most popular VoIP protocols H.323 (http://openh323.org) SIP (http://www.sipforum.org/index.php)
Both support features like VoIP, Fax over IP and video conferencing
H.323 covers almost every service available but is harder to implement than SIP
ITU:H.323 Standard
Application Layer Protocol Binary based protocol Full detail of H.323 standard on
http://www.protocols.com/pbook/h323.htm
SIP Standard
SIP = Session Initiation Protocol Text based protocol, similar to HTTP Initiating interactive communication session
between users (voice, video, chat, interactive game and virtual reality)
SIP addressing
The SIP address is identified by a SIP URL, in the format: user@host.
Examples of SIP URLs: sip:[email protected] sip:[email protected] sip:[email protected]
Useful SIP server and IP soft phone
SIP Server: OnDo SIP server Router with built-in VoIP features
IP soft phones: Windows Messenger 5.0 or higher SJPhone
References
http://wireless.ictp.trieste.it/school_2005/lectures/dillo/ICTP_VOIP_II.pdf
http://www.intel.com/network/csp/downloads/8983.htm
http://openh323.org http://www.sipforum.org/index.php http://www.skype.com
![[PPT]VoIP Project Overview - University of Floridanersp.nerdc.ufl.edu/~peterj/VoIP.ppt · Web viewVoIP = Voice over IP Provides an advanced digital communications network that bypasses](https://img.pdfslide.net/doc/110x75/5b00b0827f8b9a952f8d440e/pptvoip-project-overview-university-of-peterjvoippptweb-viewvoip-voice-over.jpg)
