I wouldn't say that Fongo Works was a drop in replacement for Fongo Home. Fongo Works is more of a switchboard.
I could be wrong, but I think you are more looking for Free Phone Line (
https://www.freephoneline.ca/) which is a sister company of Fongo.
This is a drop in replacement for Fongo Home with some differences.
There is a one time fee for FPL ($99.95 I believe currently), then you don't have to pay anything ever again. Bar the initial config file I haven't paid anything to FPL for the last 10+ years.
You have to provide your own VoIP adapter. The same sort of box they sent you for Fongo Home.
They do not provide free support. You are kind of on your own, although people here will try and help where they can. If you have to ask them for help, then there is a fee is the issue isn't on their end.
There are a lot of guides on here that cover most adapters, so if you are reasonably competent on a computer you should be able to set it up. You can always take a look at a guide ahead of time to see if you feel you can follow it.
viewforum.php?f=15All the calling areas are the same as with Fongo Home as well as costs for calling outside the free areas (e.g. US).
As with Home Phone there is a fee for porting in your number, but you can just use the free number they give you.
FPL is a more of a DIY version of Fongo Home.