Transcript Call Server

Selim SARPER - Program Director & ARGE Müdürü
[email protected]
P. Verbeeck/L. Schatteman - March 2000
All rights reserved © 2000, Alcatel, Antwerp.
Alcatel 1000 Call Server
P. Verbeeck - Program Director Call Server &
Gateways
[email protected]
Last updated: March 27th 2000
P. Verbeeck/L. Schatteman - March 2000
All rights reserved © 2000, Alcatel, Antwerp.
Topics.

Product Positioning.
 How does the network evolve?
 What is a call server?
 Where does it fit in the network?
 Some applications.
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 3
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Why does the Network topology change? (1)
Data (r)evolution:
 Data Traffic volume is rapidly overtaking Voice Traffic
volume.
 But: Voice still accounts for up to 80% of Operator
Revenues.
 Changes in regulatory environment:
 Competition forces operators to review the cost of their
operations.
 Unbundling of the network / bundling of services allows
new entrants to propose customers interesting deals.

PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 4
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Why does the Network topology change?
(2)
Dial-Up Internet traffic (over-)loading the TDM network
 Different access equipment for different service
 POTS/ISDN, Leased Line, Frame Relay, ADSL
 The need for more bandwidth
 Technology evolution.
 Codecs, processing capacity, …
 And above all:

PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 5
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Why switch to the New Network?

There can be only one reason: your bottom-line.
 New Revenues:
 Offering bundled services between voice- and data.
 Offering new services to create a synergy between both
domains.
 Enhance existing voice-services with Web-capabilities.
(e.g.: profile modifications.
 Reduce Costs:
 One single network to manage for voice and data.
 Reduced engineering cost due to self-routing capabilities
of packet-based networks.
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 6
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Network of today
SMC
Transit TDM
Data
ATM , IP
NAS
NAS = Network access server
SMC = Service Management Center
DSLAM = Digital Subscriber Line Access Multiplexer
TEX
BB
NAS
LEX
Local
DSLAM
Litespan
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 7
RSU
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Network of Today
Issues
Reduction of OPEX
 Gap between 2Mbit/s, as switching termination, and SDH at
transmission side
 Dial-Up Internet traffic (over-)loading the TDM network
 Exponential growth in the data traffic
 Different access equipment for different service
 POTS/ISDN, Leased Line, Frame Relay, ADSL
 The need for more bandwidth

PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 8
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Future network
SMC
CS
Data
ATM , IP
TGW
Transit TDM
NAS
BB
NAS
P.F.
P.F.
TGW
TGW = Trunking Gateway
CS = Call Server
P.F.
Local
DSLAM
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 9
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Network Architecture of future
4 functional layers
Legacy Network
Signaling/Service
Network
Independent
Services
Legacy Network
Media
Call Server
Gateway
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 10
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5
Controlling Voice over Data
GateKeeper
Call Server
?IP address for E.164?
?
Call server functions:
Control of access/trunking and ‘residential’ gateways
Toll/Tandem (Class 4) and Local Exchange (Class 5) bypass
Megacop and other control protocols (MGCP, Sigtran, H.323, …)
VToA and VoIP, in future also TDM and mobile
Distributes call control functionality into regional platform
Deployment of PoPs (Point of Presence) in new service areas
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 11
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The next generation “Virtual Switch”
Data
Servers
OSS
Application
Servers
Service layers
Call
Server
Control
Transport/Media
TGW
LEX/TEX
WGW
TGW
AGW
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 13
RGW
PSTN
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Call Server : network view
in data network domain
A1000
Call Server
Bank
Server
DNS
Server
Web
Server
Application
Servers
E_Mail
Server
IP/ATM
NETWORK
LEX
NAS
Multi
Media
Peripherals
Media
Gateway
IP Terminal
(SIP/H323/MGCP)
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 14
WGW
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Convergent Networks
GW
BBRAN
RAN
GW
GW
GW
PSTN
LMDS
ATM
TV
Wireless
Proxy
LAN
FR
Cable
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 15
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The Role in the NGN
A call server is the ‘intelligence’ in a distributed switch/router
network, using gateways (Trunk-, Access-, Residential-,
Wireless-GW) to convert the bearer traffic from their native
transport mode to the mode used in the data-network
(mainly IP)
 Other names, used in the industry: SoftSwitch, Call Agent
 A Call Server deals mainly with real-time services: voice,
video, multimedia
 It does not interfere with services that require no network
support

PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 16
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Integrated IP/PSTN network topology.
SCP
SCP
SCP
TCAP
INAP
LNP/WNP
Enh 800
SS7 Network
TCAP/SS7
STP
Radius
Enh 800
Call Server
ISUP/SS7
STP
Directory
INAP, TCAP,
LDAP, RADIUS
IP Internet/
Intranet
TCAP
TCAP
LDAP
IN
Services
SS7GW
MGC Call Agent
H.323 Gatekeeper
STP
ISUP/SS7
H.323
MEGACOP
ISUP/SS7
PSTN
Wireless/Wireline
PBX
IP
Media(RTP)
Gateway
MEGACOP
ISDN - BRI
Mobile
Telephone
Media(RTP)
IP Internet/
Intranet
Analog
Telephone
Media
(RTP)
Q.931
H.320
N-ISDN
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 17
Media
(RTP)
PSTN
Wireless/Wireline
IP
Gateway
MEGACOP
H.323
H.323
H.323
Terminal
PBX
Media
(RTP)
Media
(RTP)
H.323
or
MEGACOP
IP
Gateway
Q.931
Media
(RTP)
ISDN - BRI
Mobile
Telephone
H.323
Terminal
Analog
Telephone
H.321
B-ISDN
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Application:
Toll Exchange Replacement
Call Server
ISUP/N7
N7 Network
STP
STP
SS7
GW
SS7
GW
MGC Call Agent
STP network overlay
Call Control Protocol
MGCP
Signaling without STP overlay
STP
ATM / IP
Network
ISUP/N7
ISUP/N7
ISUP/N7
Control & Voice
Control & Voice
VToA / VoIP
Trunk
Gateway
Local
Exchange
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 18
Control & Voice
VToA / VoIP
Trunk
Gateway
Local
Exchange
VToA / VoIP
Trunk
Gateway
Local
Exchange
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6
Application: Local Exchange
(Class 5) Replacement
Call Server
ATM / IP
Network
Control, Voice and Data
Control, Voice and Data
Control,Voice and Data
xDSL
VToA / VoIP
Access
Gateway
VToA / VoIP
Access
Gateway
VToA / VoIP
Access
Gateway
IAD
xDSL ISDN POTS
ISDN
POTS
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 20
xDSL ISDN POTS
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9
The next generation “Virtual Switch”
Data
Servers
OSS
Application
Servers
Service layers
Call
Server
Control
Transport/Media
AGW
TGW
AGW
LEX/TEX
...
RGW
UMTS
PVb-WZ-JM/LSch - Antwerp/Plano, March 2000, page 22
All rights reserved © 2000, Alcatel