Continuous real-time conversation (from clause 13.4.1 in TR 103 708)
Clauses 6, 6.1 and 6.2.1.1 on RTT Communication contain the term "two-way communication." Even if this term "two way" means both sending and receiving for all parties in the session, it may inadvertently give the impression that it is about communication between just two parties. That should be avoided because the requirements are valid also for multiparty calls. A more general and not misleading term is "continuous real-time conversation," which is proposed to be added to the terms and replace "two-way" in clauses 6, 6.1 and 6.2.1.1 and 6.2.1.2. In the header of clause 6 and in clause 6.1, it is sufficient to replace "two-way" with "conversational real-time" in all occurrences.
It is proposed that the words "in order to provide good audio quality, that" be deleted from the clause 6.1 requirement and that following note is proposed to be added to it:
NOTE 1: The frequency range provides sufficient audio quality for reliable voice perception by most call participants.
Clause 6.2.1.1 also does not need to be tied to voice communication and is proposed to be changed to:
Where ICT provides functionality that allows continuous real-time conversation, the ICT shall provide functionality that allows RTT communication.
The word "voice" needs to be retained in clause 6.2.1.2.
The results of these proposed changes can be previewed in Annex A of TR 103 708 ( tr_103708v010101p.pdf tr_103708v010101p.docx).