Wouldn't have realized if I hadn't seen this thread. Phoned my home phone from cell and while it rings on the cell phone's end, there's no ringing on my home phone.
Checked my obi config and have it set to use voip.freephoneline.ca by default and fallback to voip2 if the first is down.
Swapped the config to use voip2 by default now and voip as the fallback. Using voip2 there are no issues on incoming calls.