Please do not create multiple threads and posts about the exact same issue. I've merged your posts into this one because the issue is exactly the same.
If you look through this thread, other users have had the same issue as you.
It can only be resolved by submitting a ticket, which is what jtan2000 did. jtan2000's problem was resolved.
Choose "my account inquiry" for the final issue type.
I've been in contact with someone at Fongo about this problem that is affecting some accounts (I tested several accounts, and all of those work normally). Affected users must submit a ticket.
Do not port forward, which is a security risk.
Again, the problem is a Fibernetics (parent company and CLEC of Freephoneline and Fongo) routing issue.
Open a ticket here:
https://support.fongo.com/hc/en-us/requests/new.
a) In the ticket, provide the specific phone numbers, times, and date for the missed calls. They will need this information.
The calls aren't reaching Fongo, so they'll need that info.
b) Select "my account inquiry" for the final issue type.