Cisco SPA122 ATA

I’m trying to get some “older” analogue diallers working for our lifts. I’ve had a look and the Cisco SPA112 is said to work (How to configure Linksys ATA devices) but I can’t get hold of one as now quite old.

I have a found a SPA122 which on paper seems to work exactly the same as the 112 except it allows for a PC to be plugged into it.

Does anyone have any advice how to get this working as currently I can see the device on the network so it’s getting a IP address OK but our IPCortex install doesn’t see it.