Merge branch 'release/v2.7.0' into develop
add FAQ for tag substitution
add documentation on Acapela
import the import to check for valide ISO_3166-1 country code
support PhoneX on tts
Review Tag replacement and Acapela instructions
underline on title of faq
update version v2.7.1
Merge branch 'release/v2.7.1'