[Resolved] Fast busy tone when calling Videotron mobile

I get a fast busy tone when calling any Videotron mobile although the recipient can see my id and his phone rings.
Even if the Videotron mobile answers the call, my Fongo home phone is still stuck on the fast busy tone.
Any ideas?
Even if the Videotron mobile answers the call, my Fongo home phone is still stuck on the fast busy tone.
Any ideas?