How does a Fax Machine Work?

How it physically works?

If it’s an old one, you will probably have to wait for a dial tone when it makes a ring sound; manually start the transition, etc. Also if people send you a fax it’s also very hard because they will have to do it manually too (even if they're using a new fax machine model).

Specialized Equipment:
Fax machines are inexpensive but maintaining a separate phone line may be cost-prohibitive if you only use the fax occasionally. Another option is to use a web-based fax service. There are several available to choose from with varying options. The web-based fax service may be less expensive than maintaining a fax machine and fax number in your home office. Additionally, you will be able to retrieve your incoming faxes while you are away from your office (like when you are hard at work on the beach).

Has it changed?

No but there could be new parts in a fax machine to make it better and faster.