leejor said:I know that the Sipura/Linksys/Cisco ATAs will do this using an analogue phone. Haven't actually tried with the VoIP sets but i would think that it is possible given that the options are very similar. It's done in the dialplan, the same way you set up the PSTN side to "DIAL" through to the trunk number of the 3CX when a call comes in on the FXO port.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.