Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/papyon/client.py", line 543, in invite_received
    self._dispatch("on_invite_conference", call)
  File "/usr/lib/pymodules/python2.7/papyon/event/__init__.py", line 44, in _dispatch
    if event_handler._dispatch_event(name, *args):
  File "/usr/lib/pymodules/python2.7/papyon/event/__init__.py", line 65, in _dispatch_event
    handler(*params)
  File "/usr/lib/python2.7/dist-packages/butterfly/connection.py", line 446, in on_invite_conference
    signal=True, call=call)
  File "/usr/lib/python2.7/dist-packages/telepathy/server/channelmanager.py", line 125, in channel_for_props
    return self.create_channel_for_props(props, signal, **args)
  File "/usr/lib/python2.7/dist-packages/telepathy/server/channelmanager.py", line 110, in create_channel_for_props
    props, **args)
  File "/usr/lib/python2.7/dist-packages/butterfly/channel_manager.py", line 146, in _get_media_channel
    raise telepathy.NotAvailable('Contact not available')
NotAvailable: org.freedesktop.Telepathy.Error.NotAvailable: Contact not available