draft-manyfolks-sipping-ToIP-01.txt

1
Real-Time Text Conversation Using SIP

• Total conversation
• Audio (VoIP)
• Video (Video conferencing)
• Real-time text conversation (Interactive text /
  ToIP)
• Real-time character by character streaming text
• closest to a voice conversation.
• RFC2793 (T.140 over RTP)

draft-manyfolks-sipping-ToIP-01.txt
2
Real-Time Text Conversation Using SIP

• Interactive text is not for hearing and speech
  impaired users ONLY!
• It is for everybody! You, me, the SIPPING chair
  etc.
• Interactive text is NOT text telephony. Text
  telephony is made possible with Interactive text.
• every user is hearing and speech impaired
• where there is a lot of background noise.
• Or where voice is inappropriate (train, bus,
  restaurant, cinema, opera, funeral).
• text communication is popular (SMS, IM, IRC)
• more text calls placed then voice (SMS)
• Real-time text conversation is for everyday use.

draft-manyfolks-sipping-ToIP-01.txt
3
Real-Time Text Conversation Using SIP

• SIP already allows Interactive text calls
• SDP describes T.140/RTP text transport on port
  11000
• mtext 11000 RTP/AVP 98artpmap98 t140/1000
• Things that need to be done in SIPPING and XCON
  WG now
• Include ToIP as a part of the SIP call flows and
  services
• For users who are only capable of using ToIP
• As convenience where the users like to use ToIP
  only or in addition to audio
• Point-to-Point calls
• Multipoint conferencing calls

draft-manyfolks-sipping-ToIP-01.txt
4
Real-Time Text Conversation Using SIP

• - Use ToIP as a part of multimedia conferencing
  scenarios
• For users who are only capable of using ToIP
• As convenience where the users like to use ToIP
  only or in addition to audio/video
• e.g., a user is a part of two conferences at the
  same time where one conference is being attended
  using ToIP whereas the other one by audio
• Or the conference is in English, while the
  users native language is Spanish. Subtitle/
  translation support.

draft-manyfolks-sipping-ToIP-01.txt
5
Real-Time Text Conversation Using SIP

• Introduction of ToIP framework
• On IP/SIP side, end to end possible.
• Text gateways needed for IP-PSTN and IP-mobile
  (non UMTS, using TCP or CTM)
• Text Gateways already DO exist! (mobile as well
  PSTN)
• Commercial roll-out Q2-Q3 2004

draft-manyfolks-sipping-ToIP-01.txt
6
CTM Mobile
V.21 Textphone
Baudot Textphone
3G Phone
CTM
V.21
CTM Gateway T.140 over IP
Int. Phone/PDA
PC Client
Baudot
V.18 Gateway T.140 over IP
Blackberry
PSTN
ToIP
ToIP
T.140 over IP Gateway TCP
ToIP
TCP
Internet
ToIP
Phone or PDA
GPRS Mobile
UMTS Mobile
SIP Phone
GPRS smart phone
7
Text Relay Operator
Billing Database
RNID Mobile Interactivetexting platform
UserDatabase
SIP PSTN Gateway
Textphone
PSTN
Interactive TextGateway
SIP Proxy
SIP Phone
J2MEClient
Passive TCPproxy
Public Internet
J2MEClient
Mobile Network
Interactive text client
8
Real-Time Text Conversation Using SIP

• Text gateways invisible on the IP side?
• Gateway emulates the end-terminal.
• emulating capabilities (transmission speed of
  text, multiple streams etc).
• Or clearly visible?
• With special indicator to indicate a text
  gateway in call
• Different SIP behavior?
• additional SIP messages?
• special labeling of streams?
• Text gateway discovery?
• Additions in SIP depend on how text gateways will
  be implemented.

draft-manyfolks-sipping-ToIP-01.txt
9
Real-Time Text Conversation Using SIP

• Any Interactive text call using the text gateway
  must work like a direct IP-IP call.
• Access to services
• Call handling, REFER, forwarding, call wait etc
• Emergency calls using interactive text
• same framework as from a SIP phone (emergency
  center)
• works same for PSTN originated call
• and also for a Mobile originated call

draft-manyfolks-sipping-ToIP-01.txt
10
Real-Time Text Conversation Using SIP

• Please
• Treat interactive texting at same value as voice
  and video when designing SIP devices and
  services.After all it is Total Conversation.
• Include the use of text gateways for the
  connectivity with SIP phones/services.
• potential problems
• special requirements
• implementations
• etc
• E-mail Arnoud van Wijk _at_ a.vwijk_at_viataal.nl

draft-manyfolks-sipping-ToIP-01.txt