Att naruc vrs presentation 2-12
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Transcript of Att naruc vrs presentation 2-12
© 2008 AT&T Knowledge Ventures. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Knowledge Ventures.1
Video Relay Service and Assignment of Numbersfor IP Based Services
February 16, 2008
Penn [email protected]
2
Introduction
All proposals seek to provide functional equivalence in reachability and access to emergency services to meet FCC mandates by
– Assigning geographic NANP numbers to relay users– Implementing a central database to support routing by any relay
provider to any relay user– Providing E911 by leveraging the technology deployed for VoIP
• Where they differ is on– Whether users should get numbers thru relay providers or some
new neutral third party– The implementation of the database
• NPAC vs. DNS, • what it contains besides telephone number• who updates it• who can access it
– Whether or not to use a common E911 VPC
3
Number Administration
AT&T Favors the “VoIP Model”:
Relay users get numbers from their chosen relay provider
Relay providers get numbers through commercial agreements with voice service providers
Proven model in use today by VoIP service providers
Avoids expense and delay of setting of third party administrator
4
Database Implementation
AT&T (like CSDVRS) favors DNS approach:
Standard Internet approach to phone number to IP mapping
Proven technology widely available from many vendors
Contains IP address to support direct connection of any provider with any user (NPAC involves designated provider on all calls, even where the hearing user had selected a different provider)
Unlike CSDVRS
DNS updated by user’s chosen relay provider to accommodate existing user equipment (100K+)
DNS accessed by relay providers– To maintain security– To accommodate existing user equipment
5
VRS Provider A
IP
IP Change Updates
Number
IP Change Updates
Hearing to Deaf Call:1.Hearing person can direct dial deaf persons personal telephone number (10 digit NANP #).2.Call routed by LEC to VRS provider.3.VRS provider looks up IPin local or central database and completes VRS call to Deaf user.
Direct Dialed (Hearing to Deaf) Call
SecureDDNS
LEC/ CLEC
IP
Number
Central DB
IP
Number
Local DB
IP
Number
Local DB
VRS Provider B
12 3
6
Direct Dialing (Deaf to Deaf)
Deaf to Deaf Call:
1. Deaf user dials 10 digit number of friend (not knowing or caring what device they use).
2. VP queries provider database, VRS provider db queries central db if needed to return current IP address of friend.
3. Direct call established to friend using current IP address.
VRS Provider
IP
SecureDDNS
IP
Number
Central DB
IP
Number
Local DB Number
1
2
3IP
7
VRS Provider 1
VRS Provider 2
URI
IP
DNS
NPAC
Dynamic DNS
Number Portability Administration Center
URI
Number
COPY
IP
URI
IP
URI
URI
Number
NPAC
URI Change Updates
VRS Provider
DDNS
IP
IP
Number
IP
Number
3rd Party NPAC
Alternate RelayProvider Selection
Toll Free Number
Toll Free Number
8
Deaf 911 Call Flow – Leveraging Current Wireless & VoIP 911 Solutions
911 Location Server
Phone, Name & Street Address
Central db
VRS Provider 1
Phone Number
User dials 911 through any
VRS ProviderVoice
IP Address
911 Routing
Sign Language Routes to proper
911 Call Center
Pre-Emergency Setup:
User registers Phone, Name, & Street Address for 911 purposes
911 Call Center receives caller’s Phone, Name &
Street Address
• When a VRS user obtains her phone number she registers her current street address with the 911 location server – through the VRS provider of her choice.
• VRS provider obtains user phone number from the Central DB (or its local database if available) and routes call to the 911 service provider for delivery to the appropriate PSAP and interprets, the emergency call for the user & 911 operator.
• If caller is not pre-registered, VI will need to obtain location information from caller, load address information in real time prior to routing the 911 call.
9
Back Up
10
Video Relay Service(from 1/6/2006 CSD Presentation to NANC)
InternetInternetPSTNPSTN
Deaf or Hard of Hearing ASL User
Hearing UserCommunications Assistant(Video Interpreter)
ASL CommunicationBetween Deaf and CA
Voice CommunicationBetween Hearing and CA
6
11
VRS Provider B
Today Multiple VRS Providers operateMultiple Separate Databases
There are an estimated 100,000 video phones in use today by Deaf & Hard of Hearing consumers.
Each provider maintains a separate and closed database of its users and devices, including their unique IP address on the Internet.• Some provider assign proxy numbers, some assign extensions, others
provide Toll Free numbers or none at all – dialing methods vary depending upon provider and device.
Because these databases are closed and do not communicate with each other end users are restricted from being able to easily dial each other.VRS Provider A
VRS Provider C
12
Simple Solution for Creating Dialing Parity
1. VRS providers assign NANP geographic numbers to deaf users. (providers can obtain numbers through commercial agreements in the same manner that VoIP service providers do today)
2. New secure 3rd Party database containing current IP address & telephone numbers of VRS users.
3. Each VRS provider must keep the Central Database current with end user IP address & telephone number using a secure Dynamic DNS interface.
4. The 100,000+ existing video phones remain the same, communicating their current IP address to the provider of the device as they do today.
Telephone numbers to IP
address
13
NPAC Proposal has significant challenges• The NPAC is not a call processing database and will not contain
IP addresses• Instead the NPAC will have URIs,
e.g. [email protected]• The NPAC downloads the URIs to a 3rd party database, which
VRS companies would have to interface with. • On calls to VRS users other than their own, the calling VRS SP
must – Query the 3rd party database for the URI– Query DNS to resolve the URI to the IP address of the serving VRS SP– Send the SETUP message to the serving VRS SP for forwarding or redirection
to the called VRS user
• New development in the NPAC is required
• VRS SPs must – Work through the company providing telephone numbers to provision the
NPAC– contract with a database provider and meet their query interface– Plan to redirect or forward calls originated by other providers