Voice over Internet Protocol VoIP Malta, 30'10' 02'11'06

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Voice over Internet Protocol (VoIP)Malta,
30.10.- 02.11.06
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VoIP-Development1. Motivation

• Development of Network Technologies

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VoIP-Development1. Motivation

• Vision
• In the year 20XX the production of
  voice-telephony takes place on basis of an
  IP-Plattform only.
• POTS-gateways will be needed to interconnect with
  still existing TDM-networks e.g. within a country
  or abroad.
• Question
• How can the transfer to the all-IP szenario be
  managed and are any technical frameworks to be
  taken into consideration?

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VoIP-Development1. Motivation
Capacity
User
100
SIP-Server/TAS
AGC/AG
ISDN/POTS
50
VoIP-User
MGC/MG
time
2004
20XX
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VoIP-Development1. Motivation

• The freephone-modell consists of three functional
  components
• Access (network)enables access to the service
  for the user
• Service (plattform)contains the customer routing
  programm
• Egress (network)terminates connection to the
  user destination
• VoIP-Technology can effect all components

Country A
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VoIP DevelopmentVoIP is allready used in the
Call Center business to reduce costs
Caller inGermany
Service inGermany
Call Center abroad
Call Center in Germany
Callerabroad

• Access
• - in Germany
• -- international

VoIP-Connection
Use of media gateways
IML1
Caller dials national number

• Crosslinking Call Centers
• - in Germany
• -- international

DDV2 /IP-VPN3
IML1

• IML Internationale Mietleitungen (international
  leased line)
• DDV Daten-Direktverbindungen (Data Direct
  Connection)
• IP-VPN IP-basiertes Virtuelles Privates Netz
  (IP based private network)

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VoIP-Development2. Implemention of the
IMS-Modells
nach TE332
The archiceture of NGN can be oriented at the
IMS-modell
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VoIP-Development2. Implemention of the
IMS-Modells
The Media Gateway Controller terminates the
signalling (7 bzw. SIP) and provides the
interworking
The control of the Media gateways is provided by
H.248/MEGACO-protokoll.
The media gateway terminates the datastreams
(Time Slots or RTP-Streams) and provides
convertion / packeting
nach TE332
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VoIP- Development 2. Implemention of the
IMS-Modells
The TAS (Telefonie Application Server) is the
central Call-Control component of the IMS-modell,
theS-CSCF (Serving Call Session Control
Function)
Only the S-CSCF has the capability to allow
application server to participateduring call
setup (IN)
The TAS comminicate both with the terminals and
with one or deveral MGCF using the SIP-protokoll
nach TE332
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VoIP- Development 2. Implemention of the
IMS-Modells
The application server can be used for any kind
of service/ logic which according to the
IMS-architecture is not part of S-CSCF.
According to my understanding this includes all
IN-plattforms.
nach TE332
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VoIP- Development 2. Implemention of the
IMS-Modells
The Home Subscriber Server contains the
subscriberprivilages for the VoIP service and the
AAA-functions
During the SIP-registration the TAS interrogates
by means of the RADIUS-protokoll die privilages
of the user and sends accounting- events after
the session
nach TE332
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VoIP- Development 3. Comparison PSTN / SIP
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VoIP- Development 3. Comparison PSTN / SIP
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VoIP- Development 3. Comparison PSTN / SIP

• Parameter / Mechanism used for freephone in the
  PSTN (ISUP/INAP)
• Trigger Detection Points (filtercriteria at SSF)
  Calling Partys Category (public
  phonesl)Application Transport Mechanism
  (Charging Value)Charge Band Number (Charging
  Vector)Furnish Charging Information (Writing
  Callrecord)Called IN Number Redirecting Number
  ( Information)Location Number (geographical
  Location Information)Freephone Indicatorforward
  service Interaction Indicator (Conference
  Treatment, Call Diversion Treatment, Call
  Offering Treatment)nP.INContainer (national
  Parameter IN-IN-Interworking)nP.SSP
• Equivalents are still missing in the SIP
  environment or are just in the process for
  standardisation

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VoIP-Development4. Issues of interest

• Transportpacket mode bearer serviceno quality
  of service guaranteedbest effort
• Numbering / addressingIP.V4 or IP.V6 addressing
  E.164 numbers must be translated into
  IP-AddressE-NUMDNS-Server

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VoIP-Development4. Numbering / addressing in
IP-Networks

• Allocation of IP-Address space through
  NIC(Network Information Center)
• IPv4 Address 32 bit Address Decimal
  (12825518767)
• IPv6 Address 128 bit Address (3,4 X 1038
  Addresses)Hexadecimal (2BA06618483400159A
  C3)
• Both address spaces are compatibel