(was first reported here: https://bugzilla.gnome.org/show_bug.cgi?id=622945 )

On Muji (Lucid, EmpathyPPA), trying to connect to ubuntu-fr@chat.jabberfr.org
room with gmail account.

On Muji the state quickly goes from "Pending channel" to "State: Failed:
org.freedesktop.Telepathy."

In the terminal I can see:
$ VIDEO_DEVICE=/dev/video0 python new-call-demo/callui.py
* starting audio call
Showing window
FAILURE: org.freedesktop.Telepathy.Error.Cancelled (Muc channel closed below
us)

and when I close the 2nd Muji window, the terminal gives:
Traceback (most recent call last):
File "/home/yyy/new-call-demo/callchannelui.py", line 321 in window_closed
self.channel.hangup(CALL_STATE_CHANGE_REASON_REQUESTED,
AttributeError: 'CallChannelUI' object has no attribute 'channel'

Same for video call:
* starting video call
Showing window
FAILURE: org.freedesktop.Telepathy.Error.Cancelled (Muc channel closed below
us)
Traceback (most recent call last):
  File "/home/yyy/new-call-demo/callchannelui.py", line 97, in <lambda>
    button.connect('clicked', lambda x: self.channel.accept())
AttributeError: 'CallChannelUI' object has no attribute 'channel'