We have analog phone lines where we are. No option for SIP lines. Internet is unreliable and bandwidth is expensive. Currently have a card in old system but would like to have this run in VM for easy recovery.I would get 2 units, as this would provide some redundancy
Why are you thinking of using FXO units, this limits the functionality of 3CX. You may be better off getting 3CX supported IP SIP phones
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.