>From my observations, if a video capable device starts the call in
non-video mode, it is never able to add video to the channel? Is this
correct, or am I missing something?

It looks as if the codec 'jointcapability' is calculated at the start
of the call, and can never be added to (with exceptions for T.38 fax)
as any SDP update is masked using the existing 'jointcapability' and
knocks out the newly requested codec.

Is that right?

Thanks,
Steve

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