I'm having this really odd issue with freephoneline, where with some callers I'll get one-way sound. It only happens during incoming calls, and it doesn't happen to many people.
It causes such frustration because the caller has no idea what's going on.
I have a Ottawa number, two numbers I've for sure had issues with is 613-446-1xxx (Rockland) and 250-703-3xxx (Courtenay). It's happened to many other callers, but I don't remember any of those numbers. I have all my ports forwarded and my SIP phone setup right.