[Standards] UPDATED: XEP-0301 (In-Band Real Time Text)

Edward Tie famtie at xs4all.nl
Mon Jul 9 11:31:19 UTC 2012

Op 09/07/2012 13:12, Gunnar Hellström schreef:
>>> One sentence will be added to satisfy this.
>>> http://xmpp.org/extensions/xep-0301.html#interoperability_considerations 
>>> To just simply mention that "...a gateway can be built as a part of 
>>> a complete solution (i.e. with optional audio, such as to support 
>>> Voice Carry Over) to support any legacy protocols used by TTY and 
>>> textphones using various protocols including Baudot, 300 baud ASCII, 
>>> DTMF, ITU-T V.18, ITU-T V.22, and other text transmission 
>>> protocols". (wording will be refined upon consultation within R3TF 
>>> including Gregg Vanderheiden who helps out in this area)
>>> There was a lot of debate within our group (i.e. Gregg Vanderheiden) 
>>> about the careful choice of wording, because we need to be sensitive 
>>> about the "complete solution" (such as worldwide interoperability, 
>>> the ability to use voice, accessibility to people who don't have 
>>> Internet, etc).
>> it's now a clear history :-)
> I agree with Mark. XEP-0301 is a protocol specification for XMPP, 
> mainly on the transport level, and should not be loaded with too much 
> info on other possibly related areas.
No. it's not clear enough. That are six a seven standaard different 
protocols. The developers must know what they uses all of protocols to 
build a whole gateway PSTN-SIP-XMPP

> But, since we already have that interoperability chapter, it can be 
> extended with a sentence.
> I suggest this addition:
> 8.3 Textphones and TTYs in the PSTN (Informational)
> Real-time text is also implemented in the PSTN, through various text 
> telephone modulation protocols specified in ITU-T V.18 *or V.22 or 300 
> baud ASCII or DTMF.*  It is possible to implement gateways between 
> audio and XEP-0301 based real-time text in IP networks and textphones 
> (called TTY in North America)  based on V.18*or V.22 or *any of its 
> Annexes in the PSTN. When designing such gateways, the limitations in 
> speed, transmission direction, character sets and media simultaneity 
> valid for these textphone protocols must be taken into consideration 
> as well as the user need to be able to at least alternate between 
> audio and real-time text during the call.
> Gunnar

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