Use laptop modem as PSTN gateway

Hi All,

I cannot see a technical reason why this is not possible, but cannot see any software to help me.

We have an office and a factory. There is a single POTS telephone line coming into the office. I would like to share this using VoIP phones. Here’s what I’m trying to do:

PSTN laptop voice modem software gateway SIP Server IP Phones

Using a setup such as aboce it should be possible to route calls from the PSTN to the IP network, have the IP phones ring when there is a PSTN call etc.

I cannot find a single piece of software to do this. Could someone please tell me 1) is this possible (I can see no technical reason why not) and 2) where can I find such a beast.

Thanks!
Justin