Sure - the software conf bridge supports G711 only.
But if you have PVDMs (as you have said you have hardware conferencing) then they can be configured to do transcoding instead. When someone tries to access the G711-only software conf bridge, CUCM will invoke a transcoder to convert the G729 to G711.
The transcoder would need to be in the same site/region as the software conference bridge for this to work.
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