Bug 977056 - [Dialer] Visual discrepancies: Call ended view under conference call participants list

Hi Doug! I have been investigating this and currently it is not possible. The reason is that with the current event notification and data flow according to https://bug977056.bugzilla.mozilla.org/attachment.cgi?id=8513389 and to the scenario when the whole conference call is hung up, there's no current way to know when a call is disconnected if the reason was that the whole conference call was hung up or if it was this concrete call the one which was hung up (we need this for example to know when to show the status message informing of the participant leaving the conference, for example). That's one of the reasons why I want to revisit the specs (sequence diagram) once this bug is over since I think that we could improve it to provide better information when the events are notified. And of course it should be a must-have and input for a proper MVC design as the one you are currently working on :p But this is another story ;)

The ConferenceGroupHandler.signalConferenceEnded() let us know that we are in the case when the whole conference call was hung up.