Internet Services for PSTN Sessions

1
Internet Services for PSTN Sessions
Vijay K. Gurbani J M van Schaick Lucent
Technologies/Bell Laboratories

• Presented by J M van Schaick
• vkg_at_bell-labs.com,lucent.comhvanschaick_at_lucent.
  com
• January 14-17, 2003, Paris, France.

2
Agenda

• The case for Internet services for PSTN sessions.
• IETF SPIRITS WG.
• Sample services.
• Implementation status.
• Example service implementation.
• Open issues.

3
Services in SIP

• Its about services how fast, how cheap, how
  novel, how to deploy them quickly, how to deploy
  them uniformly,
• Three places to provide services
• The core network (PSTN model)
• At the endpoints (IETF model)
• Hybrid

Our Focus!
4
The Network Today

• Valuable network Services
• Prepaid
• LNP, PN
• Voice VPN, Free Phone
• Calling Name
• Call Screening
• Talking Call Waiting
• HLR, SMSC,

Service Control Points
Service Nodes/ Intelligent Peripherals
Wireline IN
Switches (SSP MSC)
Wireless ANSI-41
Wireline INAP
5
Whats next?

• There are many events happening in the PSTN
  (wireline, 2G, 2.5G) today on/off hook, call
  arrival, digit analysis, SMS, registration,
  mobility, location update,
• Events can be call-related, or non-call related.
• What if we could capture these events and
  transport them out to the Internet for services?

6
Basic Model
The entire PSTN can be viewed as a simple UA!
SUBSCRIBE (or REGISTER)
200 OK
NOTIFY (or INVITE)
200 OK
MESSAGE
NOTIFY
7
Need for PSTN to IP Requests
PSTN Cloud
IP Cloud
SIP
IN
SIP
SIP
Requests/Notifications
SPIRITS - Services in the PSTN/IN Requesting
Internet Services Key Services Internet Call
Waiting/Caller ID Delivery/Call Forwarding
http//www.ietf.org/html.charters/spirits-charter.
html http//www.bell-labs.com/mailing-lists/spirit
s/
8
SPIRITS Events and Services (some)

• Conventional IN Events
• Incoming Call Notification
• (Attempt to Terminate Call)
• Attempt to dial number
• (specific event can be Attempt to Dial ISP
  Number
• Dropping Dialed Connection (i.e. dropping ISP
  call)
• ISP Connection Made
• Wireless Events
• Location Update (same/another VLR
• service area)
• Phone On
• Roaming In/Out of the Network
• SMS-gtIM
• PSTN Events
• Voice-mail Arrival
• Prepaid Zero Balance
• Attempt to Forward Call

Capturing and transporting network events encoded
in XML
9
SPIRITS and PINT

• SPIRITS is closely tied to IETF PINT (PSTN and
  Internet Interworking) WG, and in fact, is a
  mirror image of PINT.
• PINT services Click-to-dial, Click-to-fax,
  Click-to-hear-content,
• PINT WG concluded in February 2001, having met
  its deliverables.
• Historical note PINT was the first WG to
  extend SIP

10
PINT and SPIRITS reference architecture
IP Network
PINT/SIP
PINT Client
PINT Server
SPIRITS/SIP
SPIRITS Gateway
SPIRITS Server
SPIRITS/SIP
SPIRITS Client
INAP/SS7
SSP (Switch)
Service Control
PSTN/IN
11
Extending IN Location/Presence!
Non-IN Application
Service Control Points
XML/SIP
IN The Way to Get Mobile Terminal Location
Wireless IM Family / Fleet Tracking Mobile
Chat Local Info
Wireless ANSI-41
Switches (SSP MSC)
12
Other IN-IP Service Examples

• Internet Call Waiting/Caller ID
• Click-to-Dial, Collaborative Surfing,
• WebIVR
• Calendar-based Routing
• Web-Based Self Provisioning and Preference
  Scripting
• Mobile Chat / Fleet Tracking
• Combined Voice/Data VPN
• IP-Phone E.164 Hosting (ENUM)

Value of Converged Services Linking Huge
Customer Base of Paying Customers With Internet
Innovation
13
SMS Interoperating with IM

• Now SMSC node, converting to SMTP
• Proposed SPIRITS-enabled SMSC, XML- encoding
  SMS text in the body of SIP message (Proceedings
  of the 54th IETF, Yokohama, Japan).

14
Converged services
Service Example Mobile Tracker
PSTN/Wireless Network
Notify Mobiles
IN
IP Network
SIP
SIP

• Instant Notification to online users, when a
  mobile member of the Group Power-up or Power-down

15
PSTN/IP-based Prepaid Service
IP Network
SUBSCRIBEbalancegt0
NOTIFYbalancegt0
PSTN
App Server
SUBSCRIBEbalancelt5
Pre-paid Gateway
NOTIFYbalancelt5
Rating Server
Advantages of PSTN/IP-based Prepaid Low Cost of
Operations Easy to Upgrade, Manage Customizable Ac
cessible to Internet Based Apps!
16
Implementation Status

• Implemented SPIRITS services for wireline
  switches
• Applying presence to SIP URIs containing
  telephone numbers (sip6302240216_at_lucent.com)
• Instant messaging for SIP URIs containing
  telephone numbers
• Wireless services like SMS-gtIM are under
  development

17
Example service implementation
6302240216
Events On-hook, off hook, make a call, receive a
call,
18
Example service implementation
6302240216

• Coarse-grained presence
• Of course, presence based on PSTN
• events does not imply availability
• But, some information is better than
• having none at all!

19
Open issues

• How to best provide security in an open
  environment?
• Many domains
• PSTN operator
• SIP service provider
• Internet service provider
• Privacy issues
• Controlling event dissemination
• ACLs?
• What is the best way to deliver these services?
• Sign up on the web?
• Flyers in mail/email?

20
Thank You!

• mailto hvanschaick_at_lucent.com
• mailto vkg_at_lucent.com,bell-labs.com
• sipvkg_at_www-db.research.bell-labs.com
• Lucent Technologies, Inc.