Should send PUBLISH "closed" when switching off
|Reported by:||ibc||Owned by:||vadim|
When the user switches off the softphone, QuteCom should send a PUBLISH with body:
If not, it will remain as "online" for other users until the previous PUBLISH expires. Since a presence server could allow PUBLISH with long expire value (1 hour), the user would appear as "online" during an hour after switching off.