VoIP

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VoIP Technology and Business Model
Chaiyut Santananukarn Assistant Vice
President chaiyut_at_cattelecom.co.th 23 ?????? 2549
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Contents

• Introduction of VOIP
• Compare of PSTN and VOIP
• Elements of VOIP system
• Main protocols of VOIP
• VOIP Business Models
• ?????????????????????? VoIP ????????
• ???????? Application ?????????????????? VoIP
• CAT2Call Plus
• Q A

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Introduction of VOIP

• Voice over IP ????????????????????????????????????
  ??????????????????? ??????????????????????????????
  ??????????????????????????????????????????????????
  ????? ??? Internet Protocol ??????????????????????
  ????? IP ??????????????????? IP
  ???????????????????????????? ????????????????
  VoIP ??? ?????????????????????????????????????????
  ??????????????????????? IP ??? ???????????????????
  ??????????????????????????????????????????????????
  ???

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?????????????????????????? VoIP

• Conversion to PCM (Pulse Code Modulation)
  ??????????????????????????????? Analog
  ??????????????????????? Digital ???????????????
  PCM
• Removal of Echo ?????????????????????????????????
  ?????????????? ??????????????????? Echo ???
  ?????????????????????????????? DSP (Digital
  Signal Processors)
• Framing ???????????????????????????
  ????????????????????????????????????????? Frame
  ??????????????????????????????????????????????????
  ?????? CODEC ??????????????????????? Frame
  ????????????????????????????

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• Packetisation ??????????????????????????? Frame
  ?????????????????????????? Packet
  ???????????????? Header ???????? Packet
  ???????????? Header ???? ?????????????????????????
  ???????? Sequence Number ??? Time Stamp
  ??????????? Packet ??????????????????? Host
  Processor
• Address and Delivery ????????????????????????????
  ?????????? Packet ???? ???????????????????????????
  ?????????? IP Address ???????
• Conversion to Analog ???????????????????????????
  IP Address ??????????? Header ??? Packet ????????
  ????? Packet ????????????????????????? ??????
  Header ??????????????????????????????????? Voice
  Frame ?????????????????????????????? Digital PCM
  ????????????????????????? Analog
  ??????????????????????????????????????????????

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Circuit Vs Packet Switching

• Traditional Telephone System
• PSTN
• (Public Switched Telephone Network)
• IP Telephone System
• (Packet Switching )

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Convergent solutions
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ISP
ISP
Router or switching
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Voice over IP (VoIP)

• VoIP in LAN, WAN
• VoIP through Internet
• VoIP through IP network

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VoIP in LAN, WAN
IP phone
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VoIP through Internet
ISP
ISP
Mod
Mod
Gate- way
Mod
Mod
Mod
PC to PC
Modem
Mod
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VoIP through Internet
ISP
ISP
Mod
Mod
Gate- way
Mod
Mod
Mod
PC to PSTN
Modem
Mod
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VoIP through IP network
ISP
Gate- way
Gate- way
Gate Keeper
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Standards bodies and industry organizations

• ITU (International Telecommunication Union)
• SG16 (multimedia over packet networks - H.323)
• SG8 (fax)
• SG11 (signalling aspects)
• ETSI (European Telecommunication Standards
  Institute)
• TIPHON (Telephony and IP Harmonization Over
  Networks)
• SPS5 (UNI/NNI signalling aspects)
• IETF (Internet Engineering Task Force)
• PINT WG (architecture and protocols needed to
  support access of PSTN services to an IP user)
• IPTEL WG (IP telephony, gateway discovery, call
  processing syntax, etc.)

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Standards and industry activities

• VON Coalition (Voice on the Net Coalition)
• (IP telephony interoperability)
• ECTF (Enterprise Computer Telephony Forum)
• (computer telephony integration)
• ECMA (European Computer Manufacturers
  Association)
• TC32-TG11 (applications), TG12 (network
  management), TG13 (numbering), TG15 (broadband
  private networks)
• TG14 (private integrated services/corporate
  network services and signalling)
• IMTC (International Multimedia Teleconferencing
  Consortium)
• VOIP-AG (IP telephony, audio/video conferencing)
• IN Forum (Intelligent Network Forum)

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DEPLOYMENT OF VOIP IN A LONG DISTANCE NETWORK
1
2
Signaling Gateway (SG)
Signaling Gateway (SG)
Media Gateway (MG)
Media Gateway (MG)
VOIP Gateway
VOIP Gateway
3
Local Network
Local Network
Customer Premises Equipment
Customer Premises Equipment
VOIP NETWORK
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 DELAY BUDGET OF A VOIP NETWORK
VoIP Gateway
VoIP Gateway
A
Fixed Delays
B
B
C
Variable Delays
F
E
E
D
Variable Delays D Network Routing E-Queuing in
jitter buffer F- Network transmission
Total Fixed Delay 100 to 150 ms Total Variable
Delay -50 to 500ms or more Total Delay -150 to
650ms or more
Fixed Delays A- Compression B- Processing for
echo cancellation. C- Decompression
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END TO END DELAY IN VOIP
OFC/ Satellite (Transmission Network)
VOIP Gateway Codec Buffer Router
VOIP Gateway Router Buffer Codec
Local PSTN Link
Local PSTN Link
Long distance Transmission Link
60 to 400ms
20 to 50ms
20 to 50ms
25 ms
25ms
150 to 650 ms
End-to-End Delay
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Compare of PSTN and VOIP
Parameters Voice over PSTN VOIP
Connection type Connection-oriented Connection-less
Switching Circuit Packet
Bandwidth Allocation Dedicated Dynamically allocated
Latency lt100 ms Variable (150-650 ms). Dependent upon traffic. (Lower latency in managed private networks)
QOS High (Toll Quality) MOSgt4 Low and variable. Depends on packet loss, delay (latency) and jitter
Network Traffic Management (NTM) Online NTM systems available for congestion management No NTM available
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Compare of PSTN and VOIP
PSTN VOIP
Underlying Technology Circuit switching Packet switching
Management and Billings No Flexible Flexible
Network elements Class4,5 switching systems Gateways, switches, routers
Transfer Efficiency Low High
Building Cost High Low
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Elements of an integrated VoIP system
Voice Gateway
SoftSwitch (OpenCA)
Radius System
PSTN
E1 (ISDN-PRI or SS7)
Media gateway
RTP Proxy (Soluion of NAT)
Internet Network
MGCP
SoftPhone
H.323
Netmeeting
H.323
MGCP
SIP
MGCP
IAD
IAD
IP Phone
IP Phone Market
Enterprise
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• IAD converts normal phone voice data to IP
  packet,transport them into IP network.
• Media Gateway converts IP packet data to
  telephone format, transport them into
  local PSTN network.
• Softswitch Core element of VOIP system
• Address Translation
• Admissions Control
• Bandwidth Control
• Call Authorization
• Call Management

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Main protocols of VOIP

• H.323 The first generation VOIP Protocol, high
  complexity and low scalability.
• MGCP Media Gateway Control Protocol ,
• New protocol, simple
• SIP Session Initial Protocol the most
  popular protocol, service oriented,
• been used widely
• - Megaco/H.248

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H.323

• No QoS guarantee (Internet)
• LAN client endpoints providing two way
  communication
• Gateways
• Gatekeepers
• Multipoint Control Units (MCUs)
• Considerable overhead

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H.323

• ??????? H.323 ????????????????? ITU-T
  (International Telecommunications Union) Standard
  
• ??????? H.323 ????????????????????????????????????
  ???????? Multimedia Conferencing ???????????????
  LAN ???????? ?????????????????????????????????????
  ?????????????????????? VoIP ????
• ??????? H.323 ??????????????????????????????
  Point-to-Point Communications ?????? Multi-Point
  Conferences
• ???????????? ????????????????? ????????? Vendors
  ??????????????????????????? (Inter-Operate)
  ??????????? H.323 ???

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Interworking with the PSTN (H.323)
PSTN
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H.323 Protocol Stack
RTP Real time protocol RTPC Real time control
protocol RAS Registration, admission and status
TCP Transmission control protocol UDP User
datagram protocol IP Internet protocol
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H.323 standards

• H.323 v1 - Framework for video conferencing in
  LAN (released 1996)
• H.323 v2 - Added IP telephony, FAX, ATM (released
  February 1998)
• H.323 v3 - Adding real-time FAX, gateway to
  gatekeeper (underway)
• H.225.0 v2 - Call signalling
• H.235 - Security
• H.245 v3 - Control signalling
• H.246 - Interworking
• H.332 - Loose multicast
• H.450.x - Supplementary services
• G.711, G.723.1, G.729 - Audio
• H.261, H.263 - Video
• T.120 - Data

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H.323 model
H.323
H.323 MCU
H.323 Terminal
LAN
H.323 Terminal
H.323 Terminal
H.323 Gatekeeper
H.323 Gateway
LAN
N-ISDN
PSTN
V.70 Terminal
H.320 Terminal
H.324 Terminal
Speech Terminal
H.322 Terminal
Speech Terminal
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H.323 model

• Terminal
• Gateway (GW)
• Interworking between H.323 and H.320, H.324, PSTN
  (SS7, ISDN, ATM)
• Map call and control signalling
• Map media
• Network monitoring and administration
• Gatekeeper (GK)
• Address translation
• Admission control, call authorization
• Bandwidth management
• Gateway management
• Call signalling and management

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H.323 model

• Multipoint Control Unit (MCU)
• Common mode and capability management
• Multicast address management
• Audio/video conference

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Session Initiation Protocol (SIP)

• Application Layer Protocol
• Overcomes H.323's Shortcomings
• Enables VoIP clients, gateways and PBXs to
  communicate
• In Conjunction with RSVP, RTP, RTSP, SAP, SDP
• Low Overhead
• Developed as an open standard by IETF

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SIP (Session Initiation Protocol) Standard

• ??????? SIP ????????????????????? IETF Standard
  ????????????????????????????????? VoIP
• ??????? SIP ????????????????? Application Layer
  Control Protocol ????????????????? (Creating),
  ?????????????? (Modifying) ?????????????
  (Terminating) ??? Session ????????????????????????
  ??????
• ??????? SIP ??????????????????????????????????????
  ????? Client-Server Protocol
• ???????????????? Reliability ??????????????

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Media Gateway Control Protocol (MGCP)

• Conversion of signals from PSTN to data packets
• Enables media controllers and media gateways to
  communicate
• Master/Slave
• Losing ground to H.248

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Megaco/H.248

• Successor to MGCP
• Peer to peer interoperability
• Control for Media Gateway in Master/Slave
• Breaks down H.323 and set protocols for each
  component
• Leverages existing PSTN
• Developed jointly by both IETF and ITU

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Megaco/H.248
Media Gateway Controller or Call Servers or Call
Agent or Softswitch
IP Network
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VOIP Business Models

• VOIP Super Market
• - suitable for the area with large mobile
  population such as railway stations and
  schools
• - pre-paid mode
• Model For Enterprise Users
• - collect long distance call of enterprise
  with by-pass technology.
• - post-paid mode
• Model For Family Users
• - ADSL IP Digital Phone
• - post-paid mode

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An example of VOIP Super Market
a customer want to make a phone call
pre-paid some money to market boss
boss input the money to billing software and set
a phone to use
Customer use the phone to make a call
Count the call fees from billing software
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VOIP Super Market
Billing Systm
Softphone
Media GateWay
PSTN
IP Network
HUB
IAD
Billing for Market Boss
IP Room
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How to build an IP super market
Rent a room in suitable location
Apply a network line (such as ADSL)
Buy one IAD devices and some telephones
Apply an account of VOIP from VOIP service
provider
Install IP super market billing software on PC
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Model for Enterprise Users
Enterprise VOIP System is built on traditional
PBX, Intelligent IAD can separate long distance
call from call traffic. Long distance call is
sent to IP network and local call is sent to
local PSTN. The call fee of enterprise is
reduced.
Billing Sytem
Softswitch
Long Distance Call
IP Network
Media Gateway
IP
Phone line
Intra-call
Phone-line
Local Call
Router IAD
PBX
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ADSL Family User
Softphone on PC
IP Phone in Family
Billing System
softswith
Media gateway
ADSL
IP Network
Put IAD in Building and normal phone in family
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Emerging Business Model

• VOIP IC Card User
• replace traditional IC Card telephone booth with
  VOIP system, so a voice service platform is
  needed for querying left money in card and adding
  money to card.
• Bind mobile phone to IAD device
• when user want to make long distance call with
  mobile phone, he can make a local call to home
  IAD, IAD send a long distance call for him. So
  fees are saved

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?????????????????????? VoIP ????????

• Cost Savings ?????????????? VoIP ????????????
  ??????????????????????????????????????????????????
  ??????????????????????????? ???????????????????
  Router ???? Switch ????? ?????????????????????????
  ?????????
• Increase Productivity ???????????????????????????
  ??????????????????????
• Improved Level of Services ??????????????????????
  ??????????????????????????????????????
  ??????????????????????????????????????????????????
  ????????????
• Reduce Operating Expenses ???????????????????????
  ?????? ????????????????????????????????
  ??????????????????????????????????????????????????
  ??

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???????? Application ?????????????????? VoIP
PBX to PBX Connection ???? 2 ????????????????????
?????????????? PBX
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Long Line PBX Extension ?????????????????????????
?? PBX ??????????????????????
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Teleworker/Local Access Remote User
??????????????????????????????????????????????????
??????? ??????????????????????????
??????????????????????????????????????????????????
??
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Service Provider CPE
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 CAT2Call Plus

  English Version

                                                       ???????????????? CAT2Call Plus ???????????????9 ?.?.49 ???? 9.49 ?. ? ???????????????????????? ??????????????????? ????? ????????????? ??????????????????????? ????????????????????????? ??? ????????? ????? (?????)     ????????? ?????????? ???!     CAT2Call Plus...Easy Call, More SavingCAT Telecom...?????????????????????????? ?????????????????? IP Phone ????????????????? ?????????? CAT2Call Plus ???????????????????????????????????????? Broadband Internet ???????? ???????????????????????? (IAD)??????????????????????????? ????????????????????????????????????????????????????????????????????????????????????? ???????????????????? Phone to Phone??????????????????????????????????? ??????????????????? (On Net)?????????????????????????????????????????????????????????

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??????????????????? CAT2Call Plus      ?????????
? CAT Telecom ???????????????? CAT2Call
??????????????????????????????????????????????
(Voice over Internet Protocol VoIP) ???
PC-to-Phone ???? Web Phone ????????????? 1 ??????
2548 ????????? ???????????????? CAT2Call
??????????????????????????????????????????????????
??????????????????????????????????
??????????????????????????????????????????????????
??????? ??? CAT2Call ?????????????????????????????
???????????????????????, ???? Call Shop
????????????????????? ????????????????????????????
??????????????????????????? ??????????????????????
????????????????? ????????????????????? CAT
Telecom ??????????????????????????????????????????
???????????????????????????      ????????????
????????? CAT2Call ???????????????????????????????
??????????????????????????????????????????
??????????????????????? ??????? CAT Telecom
??????????????????????????????????????????????????
?????????????????? ???????????????????????????????
??????? ????????????????????????????????? (SME)
????????????????????????????? (???????????????????
??????????????????????????????????????????????????
?? CAT2Call ???? PC-to-Phone ????????)
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??????????????????      ???????????????????????????????? (Postpaid) ???????????????????????????????????????????????????????????? ??????????????????????????????????????????? ????????????????????????????????? ??? CAT Telecom ?????????????????????????????????? CAT Telecom (Sales Partner) ????????? ??????? ????? (?????????) ????? ????????? ?????? ?????????????? ????? ????????? ?????       ??????????? ???????????????????????????????? Prepaid ??????????????????????????????????????????????????????????????????????????? ????????? ??????????????????????????????????????????????????????????????????? ?????????????????????????????


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?????????????????      ?????????????????????????
?????? IAD ??????????????????? IP-Phone
??????????? ??????????? ??????????????????????????
???????????????? ????????????????? CAT2Call Plus
?????????????? ???????????????????????????????????
???????????????? ???????????????????????????????
??? ???????????????????????? CAT2Call Plus
??????????????? ????????? ???????? Sales Partner
??? CAT Telecom ?????????? ????????????????????
?????????????????????????? ????????????
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Questions ?
Questions ?
Questions ?
Questions ?
Thank you