Can the dial-up port available on (old) laptops be considered as a true FXO port (cf for instance 3cx.com/PBX/FXS-FXO.html)?
If yes, (how) can Asterisk manage this port the same way than dedicated FXO ports on external devices, for routing from SIP to PSTN.
My plan is to install Asterisk on one such laptop , so that all calls from registered SIP users be routed to PSTN via the dial-up port connected to one of FXS ports of my ADSL box (which will route back to VoIP , but with private parameters/protocol not available).
Is this idea completely crazy?
Thank you for any suggestion