IP TAX Project
Presented by : R. K. Kaushik, Jt. DDG (TAX)
NGN Concept
Service / Application Layer
Control Layer
Transport Layer
Access Layer
Each vertical on the left has to be split into Network
Elements that map onto horizontals on the right
NGN Concept
Service / Application Layer
Application Layer
Transport Layer
Access Layer
PLMN
PSTN
Circuit to Packet migration is first step in mapping of
PSTN to NGN
NGN – ITU Perspective
• Next Generation Network (NGN) provides a framework
for network evolution, as defined by the ITU-T (Rec.
Y.2001)
• Key Characteristics
– Packet-based network [generally Internet Protocol or IP]
– Independence of service-related functions from underlying
transport technologies
– Interworking with legacy networks via open interfaces
– Generalized mobility
– Unrestricted access by users to different services and/or
service providers
ETSI NGN Vision
• Mobile/Fixed Convergence, based on the “IMS” platform
• A multi-service, multi-protocol, multi-access,
IP based network - secure, reliable and trusted
• Multi-services: delivered by
a common QoS enabled core network.
• Multi-access: diverse connectivity networks;
fixed and mobile terminals, (Mobile, xDSL, etc)
• Not one network, but different networks
that interoperate seamlessly
• Mobility of both users and devices
• “My communications services”
– anywhere, any terminal
>>> all of this leads to a true Next Generation Network
The Vendor’s Perspective
• Mobile: Motorola, NEC, Nokia, Samsung
• Fixed: Cisco, Italtel, Sonus, Tekelec, Veraz
• Mobile/Fixed: Alcatel, Ericsson, Siemens,
Huawei, UTStarcom
• Fixed/Mobile: Lucent, Nortel
• Mobile/Fixed and Mobile are leaders in Session
Management
• Fixed and Fixed/Mobile are leading with MGCF
PSTN to NGN
Migration
BSNL Perspective
PSTN to NGN
PSTN
Switch
NGN Components
Call Control
Call Server /
Soft Switch
Switching
Routers of
IP/MPLS
Network
Interfaces
TDM
Transport
Network
Gateways
Common IP MPLS Transport
SG / TMG / LAG
Softswitch
Announcement
Server
Signaling
Gateway
IP MPLS Core Network
STP
Network
Trunk
Media
Gateway
PSTN Switch
Step- 1:
IP TAX – Class 4 NGN
GENERIC REFERENCE DIAGRAM FOR ‘IP BASED TAX’
SG 1,2
Sigtran / SCTP
NMS
Sigtran / SCTP
Softswitch
(MGC)
Softswitch
(MGC)
SIP-T
SG 1,2
Q.1912.5
SS7
SS7
ANNOUNCEMENT
SERVER
ANNOUNCEMENT
SERVER
H.248
STP Function
STP Function
H.248
SS7
NTP
SERVER
CORE IP
BACKBONE
NETWORK
SS7
PSTN
PSTN
Bearer Channels
Bearer Channels
MG
MG
IP/RTP
Scope of IP TAX Project
• Setting up Two Soft Switches at New Delhi and Chennai and
Signalling Gateways at New Delhi, Chennai, Kolkotta and
Bangalore
• Providing Trunk Media Gateways (TMGs) at 21 Level-1 locations
• Providing one Announcement Servers in each IP domain
• Billing interface to Centralized Billing Server
• NMS
IP TAX Components
• Soft Switch (or Call Agent or Telephony Server or
Media Gateway Controller)
– Based upon Open Architecture
– Should preferably be developed on Commercially Available
Hardware and Software Platforms
– Should be able to provide all existing services available in
TDM network
– Performs Media Gateway Control Function
– Performs Call control, signalling and interworking, Traffic
measurement and recording functions
– Provides Addressing, Analysis, routing and charging
facilities
– Interacts with Application Server to supply services not
hosted on Softswitch
IP TAX Components
• Signalling Gateway
– Provides interworking function between SS7
network and IP network
• This involves providing various types of User
Adaptations so that the SS7 signalling can be
terminated in SGW and can be translated and
messages transported over IP Network
– Performs Packetization of signalling and
ensures its transport through IP network
IP TAX Components
• Trunk Media Gateway
– Performs the functions of
•
•
•
•
•
•
Voice encoding & Compression
Packetization of voice channels
CNF (Comfort Noise Generation)
VAD (Voice Activity Detection)
Echo Cancellation
May provide the edge functionality and act as CE
NMS
New Delhi
AG
-4
JLN
-4
ND 40
JPR
-4
AM
-4
AS
0
Soft switch
(MGC)
EMS
RJ
-4
MG
SG
PT - 8
MG
MG
MG
LW 4
MG
MG
MG
GU - 4
BSNL’s MPLS Core
MG
MG
MG
AHM
-8
MG
RPR - 4
MG
MG
BPL
-4
MG
MG
MG
MBI
- 40
MG
NGP – 4
MG
MG
CBT - 4
MG
CHN
- 16
MG
BG 12
ENK - 4
CK - 4
Chennai
Soft switch
(MGC)
AS
EMS
KOL
- 16
SG
HYD
-8
Existing
STP N/w
Future IP TAX Requirement
UNIT
AN
AP
AS
BH
CHG
ETR
GJ
HP
HR
JK
JKD
KRL
KT
MH
MP
NE-I
NE-II
NTR
OR
PB
RJ
STR
TN
UCHL
UPE
UPW
WB
W TR
Gra nd Tota l
TAX
Ca pa city
Re quire d
(in KC)
10.0
358.0
64.0
213.0
50.0
533.0
391.0
110.5
87.0
43.5
150.0
523.0
329.5
327.0
259.5
22.0
74.0
360.0
139.5
248.5
322.5
667.5
504.5
34.0
330.0
42.5
89.5
192.0
6,476
Soft
Signa lling
Sw itche s Ga te w a ys
1.0
3.0
1.0
2.0
1.0
4.0
3.0
1.0
1.0
1.0
1.0
4.0
3.0
3.0
2.0
1.0
1.0
3.0
1.0
2.0
3.0
5.0
4.0
1.0
3.0
1.0
1.0
2.0
59.0
1.0
5.0
1.0
3.0
1.0
7.0
5.0
2.0
2.0
1.0
2.0
7.0
5.0
5.0
4.0
1.0
1.0
5.0
2.0
4.0
5.0
9.0
7.0
1.0
5.0
1.0
2.0
3.0
97.0
MGW s
1.0
18.0
4.0
11.0
3.0
27.0
20.0
6.0
5.0
3.0
8.0
27.0
17.0
17.0
13.0
2.0
4.0
18.0
7.0
13.0
17.0
34.0
26.0
2.0
17.0
3.0
5.0
10.0
338.0
Application
Servers
Announcement /
Media
Server
Other
VoIP
Network
Signaling
Gateway
IP MPLS Core Network
Session
Border
Controller
Customer Network
Step 2:
Softswitch
STP
Network
Trunk
Media
Gateway
PSTN Switch
Access Network
Line /
Access
Gateway
IP TAX and Access in NGN
Class 5 Components
• Application Server (or Feature Server)
– Provides service logic and execution of user (or
customer) services that are not directly hosted on
Softswitch
– Due to open architecture and standards it can be a
third party product
Class 5 Components
• Session Border Controller (SBC)
– Deployed at edge (IP-IP network border as between service provider and
customer / enterprise network) and core (IP-IP network border as between two
service providers) of service provider’s network to control
signaling and media streams as they enter / exit the
network
– Provides security, denial of service attacks, overload
control, Network Address Translation and Firewall
Traversal, Lawful Interception, QoS management,
Protocol Translation, call accounting
Class 5 Components
• Access Gateway
– Performs the functions of
• Media conversion
• Codec Negotiation
• Termination of line side interfaces like phones,
devices and PBXs
• Echo Cancellation
• VAD (Voice Activity Detection and Comfort Noise
Generation)
• Providing edge functionality and act as CE router
Next Generation Switching Architecture
Application
Server
Soft switch
SBC
PRI
Line
Access
Gateway
Access
Gateway
SHDSL
V5.2
Common IP MPLS Transport
RSU
2B+D
ADSL/ADSL2+
AN
TMG
E1s
SSTP Network
Local / Rural
Exchanges
NGN Definition
• ITU-T definition for NGN:
– A Next Generation Network (NGN) is a packetbased network able to provide services including
Telecommunication Services and able to make use
of multiple broadband, QoS-enabled transport
technologies and in which service-related
functions are independent from underlying
transport-related
technologies.
It
offers
unrestricted access by users to different service
providers. It supports generalized mobility which
will allow consistent and ubiquitous provision of
services to users
Step 3: Fully Converged Architecture
IMS Architecture
IMS Key Components
Network Function
Role
Origin
Call Session Control
Function (CSCF)
Handles registration of end
points, routing of SIP
signaling messages
SIP Proxy Servers,
Developed from scratch
Home Subscriber Server
(HSS)
One-stop database for user
information
HLR from mobile network
Media Gateway Control
Function (MGCF)
Softswitch Media Gateway
Control
Softswitch
Application Server (AS)
Provide service logic for
applications
Feature Servers, Feature
sets from Softswitches
Policy Decision Function
(PDF)
Provides QoS
Existing Policy Managers,
from scratch
Migration Path to IMS

E T S I’s M ig ra tio n P a th to IM S

S te p 1 – T e le p h o n y S o ftsw itc h s o lu tio n
 In tro d u c tio n T e le p h o n y S o fts w itc h e s
• C o s t re d u c tio n th ro u g h th e m o d e rn iza tio n
o f th e a g e in g c irc u it s witc h e d n e tw o rk .
• S e p a ra te s c a ll c o n tro l fro m c o n n e c tiv ity
• L o w e rs C A P E X a n d O P E X

S te p 2 – S o ftsw itc h / IM S s o lu tio n
 R o ll o u t o f IM S
• In tro d u c e s IM S a lo n g s id e S o fts witc h
• A llo ws in tro d u c tio n o f n e w S IP b a s e d s e rv ic e s
• In c re a s e s s e rv ic es rev e n u e s a n d c us to m e r b a s e

S te p 3 – F u ll IM S te le p h o n y s o lu tio n
 In tro d u c tio n o f IM S A c c e s s G a te w a y s
• S o fts witc h e s u p g ra d e d to te le p h o n y s e rv e rs to e n a b le fu ll -IM S
• In tro d u c tio n o f IM S te le p h o n y g ra d u a lly to re p la c e le g a c y
25
THANK YOU
NGN Class 5 Features
– Mobility: It should be possible for users to register
dynamically their current location so that they can be
contacted when mobile using a publicized address
– Forking: It should be possible to associate multiple devices
with a single address, so that all or a selection of these devices
can be contacted simultaneously or in succession
– Features Negotiation: It should be possible for the users to
negotiate media and protocol extensions to be used for a
particular call for setting up any type of media conversation,
including voice, video and messaging
NGN Class 5 Features
– Applications Flexibility: It should be possible to
define, create and implement new applications in the
network. The new applications may be built up on
separate Application Servers which may be located in
the same network / domain or in some other network
/ domain. The addition of new applications will
normally not require changes in any of the devices,
other than hosts, in the transport network
– Combinational services: It should be possible to
combine different services into one service e.g.,
instant messaging and voice
Comparison
Soft Switch
IMS
- Small step
- Yields IP cost
advantages
- Easily supports current
PSTN services
- Makes use of Intelligent
Network (IN) services
- Big step
- Yields IP cost
advantages
- Does not as easily
support current PSTN
services
- Does not use IN
- Platform for non PSTN
services
- Achieves fixed & mobile
core network
convergence.
Circuit Switching (CAS)
Transit
Local
Exchange
Call Control
Switching
Call Control
Switching
Local
Exchange
Signaling
& Bearer
Interfaces
Call Control
Signaling
& Bearer
Switching
Interfaces
Interfaces
Bearer is a voice channel
Circuit Switching (CCS)
Transit
Local
Exchange
Call Control
Switching
Call Control
Bearer
Switching
Interfaces
Local
Exchange
Call Control
Bearer
Interfaces
Switching
Interfaces
Call Control
Switching
Signaling
Signaling
Interfaces
STP
Circuit Switching (CCS)
Transit
Local
Exchange
Call Control
Switching
Call Control
Bearer
Switching
Local
Exchange
Call Control
Bearer
Interfaces
Switching
Interfaces
Interfaces
Signaling
Signaling
Transfer
Signaling
Circuit Switching (CCS)
Transit
Local
Exchange
Local
Exchange
Call Control
Call Control
Call Control
Bearer
Switching
Bearer
Transfer
Bearer
Switching
Interfaces
Interfaces
Signaling
Signaling
Transfer
Signaling
Soft Switching Transit Architecture
Transit
Local
Exchange
Local
Exchange
Soft switch
Call Control
Call Control
Gateway
Gateway
Bearer
Switching
Switching
Bearer
Common IP MPLS Transport
Interfaces
Signaling
Interfaces
Gateway
Gateway
Signaling
Next Generation Switching
Transit
Local
Exchange
Soft switch
Call Control
Gateway
Bearer
Gateway
Switching
Common IP MPLS Transport
Interfaces
Gateway
Signaling
When 3G and MPLS core are available
Transit Option-I
Local
Exchange
GSM Network
3G
Call Control
Bearer
Switching
Signaling
Common IP MPLS Transport
Interfaces
When 3G and MPLS core are available
Transit Option-II (Preferred Solution)
Local
Exchange
Soft switch
GSM Network
3G
Call Control
TMG
Bearer
Switching
Common IP MPLS Transport
Interfaces
SGW
Signaling
IMS Architecture
Overview of NMS Site - Chennai
NMS
SSW
Local Terminals
FE
FE
Billing System
LAN
SW
SGW
Gig-E
AS
PLMN
TMG
PSTN
E1/STM-1
FE
STP
PSTN/PLMN
Gig-E
MPLS Edge
Overview of Soft Switch Site - New Delhi
Remote NMS Terminals
SSW
FE
AS
PLMN
FE
LAN
SW
SGW
TMG
Gig-E
PSTN
E1/STM-1
FE
STP
PSTN/PLMN
Gig-E
MPLS Edge
Overview of SGW Site – Bangalore & Kolkatta
Remote NMS Terminals
PLMN
LAN
SW
SGW
TMG
Gig-E
PSTN
E1/STM-1
FE
STP
PSTN/PLMN
Gig-E
MPLS Edge
Overview of Other 16 Level-I Sites
Remote NMS Terminals
PLMN
LAN
SW
TMG
Gig-E
Gig-E
PSTN
E1/STM-1
MPLS Edge
EOI
EOI for NGN Project
• The TAX requirement for next two years is about
6.5 million circuits
• Tender for deployment of 200 KC IP TAX is
under evaluation
• EOI is being floated for inviting bidders to get
their equipment validated
• Successful bidders in EOI will become eligible to
participate in the future requirement of 6.5
million DS0s
EOI for NGN Project
• The EOI is for both IP TAX(Class 4) and Access
Network (Class 5)
• The EOI envisages validation for three types of
Configurations viz.,:
– a) Configuration 1.0 (IP-TAX)
– b) Configuration 2.0 (Access Network)
– c) Configuration 3.0 (Application Services)
• Validation Certificates are proposed to be issued
for each configuration
Equipment for Configuration 1.0
S#
Equipment
Qty
1
Soft Switch
2
2
Trunk Media Gateway
4
3
Signaling Gateway
4
4
LAN Switch
1
5
Announcement / Media
Server
2
6
Equipment for Billing
System Interface
1
Remarks
At least one Media Gateway of each
category (B, C, D, E)
Equipment for Configuration 2.0
S#
Equipment
Qty
Remarks
1
Soft Switch
2
2
Trunk Media Gateway
4
At least one Media Gateway of each
category (B, C, D, E)
3
Line Access Gateway
2
At least one Line Access Gateway of
each type (Type-I and Type-II)
4
Access Gateway
2
At least one Access Gateway of each type
(Type-I and Type-II)
5
Session Border Controller
1
6
Signaling Gateway
4
7
LAN Switch
1
8
Announcement / Media Server
2
9
Soft Phones
10
10
SIP Phones
20
11
IADs
5
12
Equipment for Billing System
Interface
1
Equipment for Configuration 3.0
S#
Equipment
Remarks
1
SIP Proxy Server
2
SIP Registrar
3
Redirection Server
The functions normally
assigned to the equipment
shown here may be
performed by separate or a
combination of servers.
The servers may also have
nomenclature and
philosophy, which is
different from that shown
here.
Services Requested
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Caller ID related services (CLIP, CLIR, ...)
Call waiting, Call holding, Push to talk
Call forwarding, Call transfer
Follow me service
Call blocking services, Malicious Caller Identification
Click to Dial
Musical Ring Back
Lawful interception
Announcement services
Conference call services
Voicemail, Text-to-speech, Speech-to-text
SMS, MMS
IP Centrex
Calling Card
Pay Phone
Carrier Selection
• Presence information, Instant messaging
Additional Features in Configuration 3.0
• Offered services shall have the following features:
– Mobility: It should be possible for users to register
dynamically their current location so that they can be
contacted when mobile using a publicized address
– Forking: It should be possible to associate multiple devices
with a single address, so that all or a selection of these devices
can be contacted simultaneously or in succession
– Features Negotiation: It should be possible for the users to
negotiate media and protocol extensions to be used for a
particular call for setting up any type of media conversation,
including voice, video and messaging
Additional Features in Configuration 3.0
• Offered services shall have the following features:
– Applications Flexibility: It should be possible to define,
create and implement new applications in the network. The
new applications may be built up on separate Application
Servers which may be located in the same network / domain or
in some other network / domain. The addition of new
applications will normally not require changes in any of the
devices, other than hosts, in the transport network
– Combinational services: It should be possible to combine
different services into one service e.g., instant messaging and
voice
Issues
• Should separate validation certificates be issued for the
above three configurations
• Should validation be carried out in TEC lab (if feasible) or
should BSNL allot one site to each bidder
• SIP services (and user mobility features) are proposed to
be validated in Configuration 3.0. However, this is not
covered in TEC GRs presently. Either the existing GR of
Soft Switch for Local Applications needs to be upgraded or
a separate GR may be required
• Edge Routers will be required at all Level-II TAX locations
• Routers planning below LDCC level
• ENUM
IP TAX - 1st Step towards NGN
Why NGN
Concept of NGN
1st Step
Future Steps
Current Scenario
• Level-I TAXs at 21 locations (LDCAs)
• Level-II TAXs at 301 locations (LDCAs)
Total No. of LDCCs - 322
• Tandem / Transit Switches at Big Cities / SDCC
locations (2325 locations)
No. of SDCCs 2647
Total
• Switches based on the principle of Circuit Switching
Essential Features of Public Network
• Requirements
– QoS guarantee
– High availability
• Equipment hot-swappable hardware
• 99.999% availability
• On-line software upgrades
– Scalability
– Based on global (open) standards
– Support for a new range of applications
Need for IP TAX / NGN
• Traditional public networks:
– typically comprise of individual voice & data
networks
• Separate networks mean:
–
–
–
–
Low Return on investment
High O&M costs due to separate networks
Low capability of services integration
Less Flexibility - High cost
Advantages of IP TAX / NGN
• Bandwidth Saving
– Up to 1:4
• Reduced Energy Consumption
– Up to 1:3 saving
• Reduced Operational Costs
• Reduced spare & repair costs
– Up to 90% saving
• Reduced accommodation costs
– Up to 1:5
• Network Consolidation & Trunk optimization
• Capability to provide all services including Network Wide
Services
IP TAX -
st
1
Step towards NGN
Why NGN
Concept of NGN
IP TAX Project of BSNL
Future Deployments
IP TAX -
st
1
Step towards NGN
Why NGN
Concept of NGN
IP TAX Project
Future Steps
IP TAX -
st
1
Step towards NGN
Why NGN
Concept of NGN
IP TAX Project
Future Steps
Migration Steps
• Introduce IP in Transit network at Level1 TAX locations (IP TAX Project)
• Extend IP network to Level-2 TAXs and
large scale implementation in Access
Network
• Develop MPLS core at Circle and LDCA
Level
• Offer Voice and Multimedia services to
Broadband Subscribers using DSL,
Optical Ethernet technologies
Below SDCA Level IP Network
A case of Metro City
P
Metro
Backbone
PE
BLC
AGW
MG
LAG
SHDSL
V5.2
E1
E1
PRI
AN
ADSL/ADSL2+
2B+D
Local / Rural
Exchanges
RSU
Below SDCA Level IP Network
A case of Normal City
P
PE
BLC
MG
AGW
LAG
SHDSL
V5.2
E1
E1
PRI
AN
ADSL/ADSL2+
2B+D
Local / Rural
Exchanges
RSU
Below SDCA Level IP Network
A case of Normal SDCA
P
PE
MG
AGW
V5.2
E1
E1
PRI
AN
Local / Rural
Exchanges
RSU
Core network
MPLSMPLS
Core
Network
Mesh network
Connecting all Level-1 TAXs at
2.5G λ / 10G λ