The fax machine shows that the mobile phone is in use! I changed the link in the router settings, will it affect the fax machine?

This explains the significance of making a phone call.

Please check that the call handle is in place.

Is a voice separator installed?

If there is no problem above, disconnect the telephone line interface of the cat and see if it is still displayed. If it still displays, it is a problem with the fax machine. If it is normal, it has something to do with cats.

The first type and fax machine are most likely to break down? The possibility of language separator and cat influence is very low? It's basically 0.