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DUST
Duplex Universal Speech and Text
e-Inclusion
The work of STF 267
A project funded by the European Union
This presentation
 Describes what is needed
 Describes challenges of texting
 Suggests how to overcome them
 Describes some history of the present situation
 Describes the DUST concept
 Describes some implementations
 Outlines the ETSI Guide
Text communication for all "DUST"
2
The Team
 Wally Mellors - STF leader
 Scott Cadzow
 Ed Fitzgerald
 Gunnar Hellstrom
Text communication for all "DUST"
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Text user requirements
To have equal accessibility
To be able to communicate with
others worldwide
As easily as speech communication
Text communication for all "DUST"
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What is needed
 Conversation in real time by text and voice
 Duplex working (two way simultaneous)
 Simple call set up and clear down
 Progress information in text form
 Provision of relay services
 Access to emergency services
 Provision for signing and lipreading
 Similar to an ordinary telephone call
Text communication for all "DUST"
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The challenge of texting
 Instant messaging and SMS are popular text
services
 They are not equivalent to Voice telephony
 No natural conversation flow
 Is an answer coming?
 Shall I send more text?
 Resulting in disjointed conversation
 Conversational Text is needed to complete
the suite of telecom services
Text communication for all "DUST"
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Problems with fluency
Simon ~ In the office... says:
Hi - How is your meeting going? Well?
Claude - In Paris - Back on Monday says:
Yes - all is fine!
Simon ~ In the office... says:
Is George in the same meeting?
Simon ~ In the office... says:
Could you bring something back from Paris for me?
Claude - In Paris - Back on Monday says:
No!
Simon ~ In the office... says:
Oh … but its for my girlfriend’s birthday and I’ll repay the favour – please!
Claude - In Paris - Back on Monday says:
No!! George phoned and said he couldn’t make it as he is sick! …
Something he ate.
Claude - In Paris - Back on Monday says:
Sorry. What is it you want me to get for your girlfriend?
Text communication for all "DUST"
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What is text conversation?
 Text appears at each end character by character as it
is typed
 The two parties have the feeling of being in
continuous contact
 Just as in a spoken conversation
User A
User B
Why do you need character by character
transmission?
Because then you get a feeling of being
continuously in touch
.
Yes, I see, I can almost read your thoughts as
you express them. No waiting. Good!
Text communication for all "DUST"
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A bit of history
 Text telephony started in America with old
teletype machines in the 1960s
 Various other Countries started with newer
“improved” terminals
 Unfortunately - There was no harmonisation
 Result – 5 different systems in Europe
 Worse – They can’t talk to one another
Text communication for all "DUST"
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Result
 Deaf users caught up in generally national
systems
 With full text access limited to other deaf
textphone users
 Seven kinds of legacy PSTN textphones
 Will not disappear tomorrow
 ITU-T V.18 compatible with all
 Most deaf users do not have access to 112
emergency services
Text communication for all "DUST"
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The DUST concept
D - Duplex – simultaneous send and receive
U – Universal - Worldwide on all networks
S – Speech in both directions
T – Text with conversational flow
Text communication for all "DUST"
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The DUST service
 Simultaneous text and voice – no mode
switching
 In a mainstream environment
 Using only open and available standards
 Duplex – no need for turn taking
 Easy call set - up
 Full network services
 Supplementary services
 Emergency calls
 Provision for multimedia
Text communication for all "DUST"
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Services
 Basic call
 Supplementary services. Hold, transfer, etc
 Emergency service 112
 Relay service with text support
 Text <> voice
 Hard to understand speech <> clear
speech
 Sign language <> voice
 Interoperability between DUST Host
environments
 Interoperability with legacy systems
Text communication for all "DUST"
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Coexistence via Gateway functions
Textphone
PSTN
IP Network
Gateway
DUST terminal
Text communication for all "DUST"
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The Future
 Text Conversation available to ALL
 Across all networks
 Using open and available standards
 All terminals interwork
 Full legacy support
 Texting anywhere anytime
 With voice available
 And with Video for signing and lipreading
Text communication for all "DUST"
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This is the future
Fixed textphone user
Fixed Network
Cellular Network
Mobile,
text capable
terminals
Fixed multimedia user
IP textphone or multimedia
user
IP
network
Cellular Network
Text communication for all "DUST"
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We work towards it
Thank you for listening