My OBi110 is no longer ringing for incoming calls. If I pick up when someone is calling (say if I call myself from another phone), then the connection is made, but the phones don't actually ring. This is a new(ish) development - I've had the OBi110 working with these phones for some time.
Outgoing calls work fine.
Is this a known problem? And, if so, is there a fix?