RTT responsiveness (from clause 13.4.10 of TR 103 708)
The notes in clause 6.2.4 about "RTT responsiveness", may be a good place to add extra information about the benefits of RTT to motivate implementers to provide good RTT functionality. Note 1 is proposed to be extended for the case of composed characters. An added Note 4 is proposed to be added to clause 6.2.4:
NOTE 1: For character-by-character input, the "smallest reliably composed unit of text entry" would be a character even if it is composed by multiple keystrokes. For word prediction it would be a word. For some voice recognition systems - the text may not exit the recognition software until an entire word (or phrase) has been spoken. In this case, the smallest reliably composed unit of text entry available to the ICT would be the word (or phrase). ......
NOTE 4: During emergency service applications, it is especially critical to send the smallest reliably composed unit of text entry within 500 ms, regardless of any user setting or preferences.
The results of these proposed changes can be previewed in Annex A of TR 103 708 ( tr_103708v010101p.pdf tr_103708v010101p.docx).