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
