VISE FREE STOPP IN URUMQI???

Hi,
we are AUSTRIAN CITIZENS and will fly with China Southern from
VIENNA via URUMQI (2:10 hrs. Stopp)
to GUANGZHOU (3:15 hrs. Stopp)
and connect with China Eastern via KUNMING (8:30 hrs. Stopp)
to MANDALAY (Myanmar).
In Total we will arrive at URUMQI at 14:55 hrs. and finally depart KUNMING at 08:05 hrs. next morning
= Total Transit time of 17hrs. 10 min.
Return flights are-
BANGKOK to GUANGZOU (5 hrs. Stopp)
GUANGZHOU- to URUMQI (2:35 hrs. Stopp)
URUMQI to VIENNA
DO I NEED ANY VISA IN ADVANCE??
China Southern told me to contact the embassy in Vienna
The Embassy has sent me to China Visa Application Service Center in Vienna
CVASC told me that they are not responsible for visafree Transit and i should ask the Airline!
We are a Family of 5! 5 x €126 = €630,-