the support guy advised me to describe that in Ideas section. Please upvote:
https://support.counterpath.com/responses/support-for-rfc5168-picture-fast-update-for-videoconferencing

On Wed, Sep 24, 2014 at 2:16 AM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:

I found out that Bria 4 for Windows ignores the SIP INFO with picture_fast_update, answering with 500 error. As a result, in a video conference, when active floor holder switches to a Bria user, everyone sees garbage.

Tested with both VP8 and H264 codecs.

Bria for Android accepts the INFO and refreshes the picture properly.

I also opened a topic on their support forum:
https://support.counterpath.com/responses/bria-4-ignores-sip-info-with-picture-fast-update

Any tips, ideas, suggestions to make the conferencing work under Windows?

thanks,
stanislav