This document provides an overview of the core components and architecture of the MAX-NG telecommunications network developed by C-DOT. It describes key elements like the softswitch, gateways, session border controller, subscriber database, and element management system. It explains the roles and functions of the class 5 subscriber server, class 4 trunking server, signalling gateway, and other elements that make up the MAX-NG core network and allow connectivity to external networks like PSTN.

1. Centre for Development of Telematics
MAX-NG
A Practical Approach
Field Support – Bangalore 10th April 2018

2. Centre for Development of Telematics
CORE
ACCESS
Components of MAXNG
Copyright © 2016 C-DOT. All Rights Reserved
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SOFTSWITCH
GATEWAYS

3. Centre for Development of Telematics
www.cdot.in C-DOT Proprietary
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BMN
BM1
VU
BM
RBM
CM
TBM
LEADING
TAX
PCMs
PSTN CLOUD
PCMs
TERMINATING
TAX
TERM.
EXCHG
ANRAX
PCM
s
LAG
1
LAG
N
V5
IP
C5
C4
EM
S
BILLIN
G
MEDIA
G/W
SIG
G/W
PCMs
LAG
PCMs
MIGRATION APPROACH

4. Centre for Development of Telematics TYPICAL NETWORK
V5AG
LAG
SG/MG
SIP
SIP
V5.2
M3UA/Megaco
SIP Subscriber
LAG subscriber
PSTN
Subscriber
AN-RAX
AN-RAX
4
PBX
PRI GW
30B+D

5. Centre for Development of Telematics
02-07-2023
5
HP Server
CORE

6. Centre for Development of Telematics MAX-NG Core Architecture
Layer 3 Switch
Server Farm
PE Router
MPLS Core
Network
Layer 3 Switch
1G
Primary Site DR Site
GigE
GigE
1G
Server Farm
01-04-2018
PE Router
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7. Centre for Development of Telematics
Sl.
No.
Software Modules Blade Server required
1 Class 5 Subscriber Server 1+1
2 Class 4 Trunking Server 1+1
3 IN Service Switching Point 1+1
4 Session Border Controller 1+1
5 SIGTRAN Signaling Gateway 1+1
6 Rating and Charging 1+1
7 Lawful Interception Interface 1+1
8 Subscriber Database 1+1
9 Subscriber Provisioning 1+1
10 Element Management 1+1
11 Spare Blade Server 2+2
Software Modules
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8. Centre for Development of Telematics Soft Switch (SS)
 A central device in a telecommunications network which
connects telephone calls from one phone line to another,
entirely by means of software running on a server. SIP
protocol is used to establish calls.
 Currently in MAX N/W switching is carried out by hardware,
with physical switchboards to route the calls.
 Soft switch
 Class 5 SS – Call Agent, Caller Server.
 Class 4 SS – Media Gateway Controller.
OT. All Rights Reserved
02-07-2023
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9. Centre for Development of Telematics Class 5 Subscriber Server
 Class 5 Subscriber Server (or call agent or call server) is a
device that has an Intelligence that controls connection
services for an access gateway, and/or native IP endpoints.
02-07-2023
Copyright © 2016 C-DOT. All Rights Reserved
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10. Centre for Development of Telematics C5 – System Architecture
OT. All Rights Reserved
Database
Server
IN
OUT
Media
Server
Feature
Server
Registrar Proxy
Billing
Server
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11. Centre for Development of Telematics C5 - Components
OT. All Rights Reserved
NGCPE
(Next Generation
Call Processing
Engine)
Soft switch Entry
Point
Registers VoIP
Subscribers
Accounting of
Time
NGFS
(Next Generation
Feature server)
Subscriber
Features
Routing
“Application
server”
CDOT-GUI
Subscriber
Administration
(Create, Delete,
Modify)
NGMS
(Next Generation
Media Server)
Announcements
Media Related
Services
DB Server
Subscriber
Related Info
(e.g. Subscriber
Type, Status,
Services etc.)
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12. Centre for Development of Telematics C4 - Trunking Server
 Class 4 soft switch is used to deliver calls of MAX-NG subscribers to
PLMN/PSTN network via Signaling and Media Gateway and vice-versa
 MGC perform call control and signaling routing for PSTN and Signaling
System 7 (SS7) voice traffic
 The interface between Class 5 to Class 4 Softswitch is SIP
 MGC uses a Signaling Gateway (SG) to get SS7 signaling over IP, and
provides ISUP to SIP and back translation.
 MGC controls Media Gateway (MG) using MEGACO/H.248 to translate the
voice/media call component from TDM to RTP and back.
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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13. Centre for Development of Telematics C4 Trunking Server
Copyright © 2016 C-DOT. All Rights Reserved
CLASS 5
SOFTSWITCH
CLASS 4
SOFTSWITCH
MEDIA
GATEWAY
SIGNALLING
GATEWAY
SIP
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14. Centre for Development of Telematics SG Server
 A Signaling Gateway is a network component solely responsible
for translating signaling messages between one medium
(usually IP) and another (PSTN) .
 In the MAX-NG network Signalling Gateway Comprise of Server
and Line Card.
 A Signaling Gateway creates a bridge between the SS7 network
and an IP network, under the control of the Media Gateway
Controller.
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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15. Centre for Development of Telematics SG Server contd..
 A Signaling Gateway causes a Soft switch to appear like an
ordinary SS7 point code (SS7 node) in an SS7 network.
 The Signaling Gateway shall provide stand alone Signal
Transfer Point (STP) equipment functionality .
 The Signalling Gateway supports two protocol stacks namely:-
 SS7 stack
 SIGTRAN stack
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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16. Centre for Development of Telematics SG Server contd..
Copyright © 2016 C-DOT. All Rights Reserved
SGP SERVER
IP
SCTP
M3UA
MTP1
MTP2
MTP3
ISUP
SIGTRAN SS7
CLASS 4
SOFTSWICH
TDM
EXCHANGE
I
P
E
1
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17. Centre for Development of Telematics Session Border Control
 Session Border Controller (SBC) is mainly to work as the gatekeeper
of NGN Network. Main functions of SBC are Security, Connectivity,
QoS and Media Services.
 Breaks in to two logical pieces (SIG/MEDIA)
 It allows only authorized sessions to pass through the
connection point .
 An SBC can also serve as a firewall for session traffic
identifying specific incoming threats to the communications
environment.
OT. All Rights Reserved
02-07-2023
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18. Centre for Development of Telematics SBC-Adding routes
 Routes have to be created in SBC:-
 If nodes in external network are to be communicate with
elements in MAX-NG network.
 Routes can be added for following nodes (adjacencies):-
 To configure routes, routing tables have to be added:-
 RegisterTable (for REGISTER requests) & InviteTable (for INVITE
requests)
 Tables (reg. table & invite table) from where routing has to be started
are invoked as initial tables.
OT. All Rights Reserved
Gateways Soft Switch
Line Media
Gateway
Public
VPN
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19. Centre for Development of Telematics
Rating Engine
 The Rating engine is a system used to determine the customer
chargeable units based on:
 Type of the day
 Time of day
 Call duration
 Process the CDRs received from C5 soft switch and send the
billing records to the billing server in the desired formats for
billing
 Processed CDRs are pulled by BSNL CDR Data centers
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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20. Centre for Development of Telematics Element Management System
 A GUI based solution for configuring and monitoring the
different systems installed as MAX-NG components.
 MAX-NG devices management through single window:-
 Node Discovery
 Chassis view
 Region-wise map
 Alarms
 Configuration commands
 Traffic Reports
 User Administration
 Centralized backup and restoration facility
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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21. Centre for Development of Telematics IN - Service Switching Point
 It is a module that switches the calls during IN services.
 This module is used to get the LRN for mobile calls from SSTP
 It queries the SCP(Service Control Point) whenever it receives a trigger.
Copyright © 2016 C-DOT. All Rights Reserved
02-07-2023
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22. Centre for Development of Telematics
Subscriber Database Server
 Database Server Holds Subscriber Related Information
e.g. Type of Subscriber, Services and Status etc.
02-07-2023
Copyright © 2016 C-DOT. All Rights Reserved
22

23. Centre for Development of Telematics Provisioning Server
 A Next Generation Subscription Management (NGSM)
mediation server is provided at BSNL for service
provisioning.
02-07-2023
Copyright © 2016 C-DOT. All Rights Reserved
23

24. Centre for Development of Telematics
02-07-2023
Copyright © 2016 C-DOT. All Rights Reserved
 Monitoring the calls of a particular subscriber.
 The calls are diverted to another number as configured
Lawful Interception System
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25. Centre for Development of Telematics
Flowchart Explaining the role of each core element
OT. All Rights Reserved
Subscriber Dials a
Number
Request reaches
SBC
Valid?
Request Forwarded
to C5
Yes
No
Called
Number
Valid?
No
Yes
Called
Number in
DB?
Request Forwarded
to the called party
SBC C5
Yes
No
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26. Centre for Development of Telematics
Copyright © 2016 C-DOT. All Rights Reserved
Request Forwarded
to C4
C4
CDPN
based route
available?
Request Forwarded to
respective SG/MG
Yes
No
SG/MG
Request Forwarded to
respective subscriber
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27. Centre for Development of Telematics PR-GR CONFIGURATION - PUNE
MPLS
PU
N
PR
PUN
PR
BPL
GR
PUN GR
BPL
GR
BPL PR
BPL PR
agg1
agg2
agg
1
agg2
IMS
PUNE
IPTAX
PUNE
IPTA
X
AHM
SST
P
THA
N
SSTP
AHM
ITPC
PUN
E
GMSC
PUNE
GMSC
RAIPR
PUN GR

28. Centre for Development of Telematics PR-GR CONFIGURATION - BLR
MPLS
BL
R
PR
BLR
PR
HY
D
GR
BLR GR
HYD
GR
HYD PR
HYD PR
agg1
agg2
agg
1
agg2
IMS
BL
R
IPTAX
ERK 2
IPTA
X
BLR
1
IPTAX
BLR 2
IPTA
X
BLG
V
IPTAX
MAN
G
IPTA
X
ERK
1
Tande
m BLR
SST
P
BLR
SSTP
HYD
ITP
C
HYD
GMSC
BLR
HUW
GMSC
BLR
ZTE
GMSC
ERK
ZTE
GMSC
CLKT
HWU
IPTAX
HYD 1
IPTAX
HYD 2

29. Centre for Development of Telematics PR-GR CONFIGURATION - HYD
MPLS
HYD GR
BLR PR
BLR PR
agg
1
agg2
IMS
HY
D
IPTAX
HYD 1
IPTA
X
CBT
1
IPTAX
CBT 2
IPTA
X
RJM
D
IPTAX
GNTR
IPTA
X
HYD
2
IPTAX
ERK 1
SST
P
BLR
1
SSTP
HYD 1
ITP
C
HYD
GMSC
VJD
HUW
GMSC
HYD
ZTE
GMSC
CHN
ZTE1
GMSC
CHN
ZTE2
IPTAX
CHN 1
IPTAX
CHN 2
HYD
GR
IPTAX
ERK 2
SSTP
HYD 2
SST
P
BLR
2
GMSC
CBT
HUW
GMSC
MDR
HUW
agg1
agg2
HYD PR
HYD PR
BPL GR
BPL GR

30. Centre for Development of Telematics
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Access Elements
LAGU CACU
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31. Centre for Development of Telematics
MAX-NG LAG SYSTEM
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32. Centre for Development of Telematics Central access control unit
FRAME TO HANG DDF
MODULE
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33. Centre for Development of Telematics
Central Access Control Unit
FRAME TO
INSTALL DDF
MODULE
CACU CHASIS
DDF MODULE
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