BUG with "End Call"

Message from Philippe, working in Paris - France
Using "telephone" with french SFR provider and "voip.wengo.fr" as domain name.
The command "End Call" (cmd+.) does not work. When you press the double key, the message well indicates that your call is ended, but the line is still ONLINE... To end the call, I need to QUIT the app.
Can you explain me what is going on?
Thanks in advance,
Philippe

Philou75005 about Telephone, v1.0.4