After latest update from 20.7 to 20.9 one of our sip trunks stopped working. Regretably I do not have a backup of 3cx vm. Is there a way to dowgrade from 20.9 to 20.7 or to reintall using 20.7 image?
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.