Transcript Toward Converged Networks and Services

Converged Services
Igor Faynberg ([email protected])
Hui-Lan Lu ([email protected])
Bell Labs, Lucent Technologies
Workshop on IP-Networking and
MEDIACOM 2004, Geneva
Slide 1, Faynberg & Lu
SG 13 Workshop
Outline

What do we mean by convergence?
 Adjusting the PSTN to the Internet
– Access to the Internet over the PSTN lines
– Internet off-load

Adjusting the Internet to the PSTN
–
–
–
–
–
–
–

IP telephony
PINT
SPIRITS
Unified Messaging
Voice Access to the Web
Porting of PSTN intelligence into the IP telephony world (SIN)
VPN
Conclusion
Slide 2, Faynberg & Lu
SG 13 Workshop
Three Aspects of Convergence
1) Interworking of “traditional” PSTN with the IP infrastructure to
support voice over IP
2) Interworking of PSTN with the IP infrastructure to deliver IPbased service control for “traditional” PSTN calls (i.e., IP
Telephony without voice over IP)
3) Interworking of PSTN with the IP infrastructure to provide remote
access to IP networks via PSTN lines
Slide 3, Faynberg & Lu
SG 13 Workshop
Adjusting the PSTN to the Internet
(PSTN access to IP networks)

Exploiting the bandwidth that can be supported by two-wire
telephone access lines
+ Pulse Code Modulation (PCM) modem
+ Digital Subscriber’s Line (DSL)
 Offloading Internet traffic from the PSTN
Slide 4, Faynberg & Lu
SG 13 Workshop
PSTN Congestion due to Internet Traffic
PSTN
Internet
User
Ingress
Switch
SS7
Network
Egress
Switch
Remote
Access
Server
ISP
Internet
congestion
Slide 5, Faynberg & Lu
SG 13 Workshop
An Internet Offload Solution
Ingress
Switch
PSTN
Internet
User
SS7
Network
Egress
Switch
Softswitch
Remote
Access
Server
ISP
Internet
Slide 6, Faynberg & Lu
SG 13 Workshop
Adjusting the Internet to the PSTN (two aspects)
1) Support of the IP telephony requirements:
 A new IP endpoint--IP telephony gateway--is required to
interconnect the Internet and the PSTN
 QoS must be enforced
 The IP and PSTN naming and addressing schemes must
interwork
2) The Internet-based support of the PSTN services requirement:
 Keep the intelligence at the edges! (Or, at least, share it with the
edges)
Slide 7, Faynberg & Lu
SG 13 Workshop
PC-to-PC (1)
PSTN as an access vehicle
IP Network
PSTN
Network
Access Server
dialup
access
Slide 8, Faynberg & Lu
SG 13 Workshop
PC-to-PC (2)
PSTN as the backbone transport
PSTN
Enterprise B
Enterprise A
IP PBX
Gateway
Slide 9, Faynberg & Lu
Gateway
SG 13 Workshop
IP PBX
Phone-to-PC or vice versa
IP Network
PSTN
Gateway
Slide 10, Faynberg & Lu
SG 13 Workshop
Phone-to-phone
IP trunking
Home
Gateway
PSTN
IP Network
Enterprise
Gateway
Slide 11, Faynberg & Lu
Gateway
SG 13 Workshop
Why IP telephony?

Toll bypass avoids long-distance call charges.
 One type of networks for both voice and data simplifies network
operation, administration, and management.
 Easy integration with other IP applications promises richer than
ever telephony services.
Slide 12, Faynberg & Lu
SG 13 Workshop
Converged IP Telephony Architecture
IVR
System
Public Switched
Telephone Network
SCP
SS7
voice
Media
Gateway
H.323
Terminal
H.248
Soft Switch
voice
SIP
User
Agent
SIP/H.323
SIP User
Agent
H.323
Terminal
Gatekeeper Cloud
SIP Server Cloud
IP Network
Slide 13, Faynberg & Lu
SG 13 Workshop
PSTN/Internet Interworking (PINT)
PINT
Client
Internet
PINT
Gateway
SIP
SCP
PSTN
Requests

Request to call

Request to hear content

Request to fax

Future: Request to Conference
Internet Enhancing PSTN Call Control
Slide 14, Faynberg & Lu
SG 13 Workshop
PINT has successfully concluded, but …
There are potential services for the future
•
•
•
•
•
•
•
•
Slide 15, Faynberg & Lu
Multimedia conferencing
Free calls (paid by advertisers)
– with the profiling feature
Speed Call list provisioning
Service Subscription
Follow-me service provisioning
Access to communications bills
Account information changes
VPN Provisioning
SG 13 Workshop
Services in the PSTN/IN Requesting InTernet
Services (SPIRITS)
SPIRITS
Server
Internet
SPIRITS
Gateway
SCP
PSTN
Requests & Notifications
• Internet Call Waiting
• Internet Caller ID
• Voice Mail arrival
• Phone Off-hook detection
Utilizing the Internet for PSTN Service Notification
Slide 16, Faynberg & Lu
SG 13 Workshop
Joint PINT/SPIRITS Architecture
Telephony
SPIRITS
Gateway
Server
Telephony
PINT
Gateway
Client
B
PSTN
A
Telephony
PINT
Gateway
Server
Telephony
SPIRITS
Gateway
Gateway
IP Network
Switch
C
Telephony
SPIRITS
Gateway
Client
Service
control
Slide 17, Faynberg & Lu
SG 13 Workshop
SPIRITS Status
1) The Implementation RFC (informational) RFC 2995 has been
published
2) The Architectural RFC candidate has undergone WG last call
3) The Requirements RFC candidate is in the process of
consensus building
4) The protocol work is under way
Slide 18, Faynberg & Lu
SG 13 Workshop
Unified Messaging
Fax Sender
Fax
Reader
Voice
Directory
Voice
Mail
E-Mail
Visual
Mail
Hello...
E
Beep...
Beep...
Incoming Message
Notification
The ability to create, send and retrieve any type of message–anytime, anywhere–
with any terminal...
Slide 19, Faynberg & Lu
SG 13 Workshop
Voice Access to the Web
Residential
•Stock quotes
•Traffic conditions
•Web-based Yellow/White pages
•Local Events
•Personalized Web page services
Corporate Data
Internet
HTTP
PSTN
Intranet
VoiceXML
Switch
Voice
Browser
Web / Application
Server
Voice Service Logic
Voice Service Logic on Web Servers
Slide 20, Faynberg & Lu
SG 13 Workshop
SIP/INAP Interworking (SIN)
[IETF Design Team]
IP Network
Intelligent
Peripheral
Switch
SIP
Telephony
Soft
Switch
Gateway
Service Control Point
PSTN
Slide 21, Faynberg & Lu
SG 13 Workshop
Virtual Private Network
PSTN
Access
Server
Tunnel
Gateway
Enterprise
IP
Network Island
Enterprise
IP
Network Island
Tunnel
Gateway
Internet
Tunnel
Gateway
Slide 22, Faynberg & Lu
SG 13 Workshop
Conclusion






Regardless of the economical success of the IP telephony, there
is room for integration of the traditional telephony and Internet
We consider convergence to be co-existence and symbiosis of
the evolving PSTN and Internet (not the consumption of one by
another); this symbiosis is manifested in integration
Integration of pure IP telephony with the PSTN has been worked
in the IETF enum and megaco WGs together with ITU-T SG 2
and SG 16, respectively.
Intelligent Network is a natural PSTN platform to support such
integration; ITU-T SG 11 and IETF (pint, spirits) have had a
productive cooperative effort to this end.
The emphasis of the industry now is on enhanced services
rather than “pipes”; services are key differentiators
RECOMMENDATION: the standards organizations should
concentrate on providing building blocks for developing services
in converged networks
Slide 23, Faynberg & Lu
SG 13 Workshop