How do I know if my IP phone / FXO / FXS / ISDN gateway works with Axon?

The primary thing to verify is if the device is SIP 2.0 compliant. Check the manufacturer's page to see if it mentions "SIP" or "RFC3261", which is the other name for the protocol. If it does, there is a very good chance it will work fine.

We guarantee the IP Phones at http://www.nch.com.au/hardware/ipphones.html and FXO devices at http://www.nch.com.au/hardware/fxo.html will work with Axon. There are of course other models and unfortunately we cannot test them all. So if in doubt we recommend you buy from the above link, or failing that you should buy a similar product from the same companies mentioned on those pages.

If you do find another device which either works or has problems let us know by posting it on the Axon Forum to help others.