draft-manyfolks-sipping-ToIP-01.txt 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)

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 Real-Time Text Conversation Using SIP

draft-manyfolks-sipping-ToIP-01.txt Real-Time Text Conversation Using SIP SIP already allows Interactive text calls SDP describes T.140/RTP text transport on port m=text RTP/AVP 98 a=rtpmap:98 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

- 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 user’s native language is Spanish. Subtitle/ translation support. Real-Time Text Conversation Using SIP draft-manyfolks-sipping-ToIP-01.txt

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

V.18 Gateway T.140 over IP PSTN Internet T.140 over IP Gateway TCP PC Client SIP Phone ToIP V.21 Textphone Baudot Textphone Baudot V.21 Blackberry GPRS smart phone TCP ToIP GPRS Mobile CTM Gateway T.140 over IP CTM Mobile Int. Phone/PDA CTM 3G Phone UMTS Mobile Phone or PDA ToIP

SIP Proxy SIP PSTN Gateway Textphone Interactive text client PSTN Mobile Network Public Internet RNID Mobile Interactive texting platform Interactive Text Gateway Billing Database User Database J2ME Client Passive TCP proxy Text Relay Operator SIP Phone

draft-manyfolks-sipping-ToIP-01.txt 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 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 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 Arnoud van