I cannot initiate a video call with a 9951. The 9951 can display video if the remote side such as a CUPC soft phone initiates a video call but there is no soft key or programmable feature button to initiate a video call. I have loaded 9.0.3 sip-9951 same issue. I have enabled video globally with the enterprise defaults and at the device level.
Have you verified that all of your 9951 phones are at the 9.0.3 firmware level? I have seen cases where this could cause problems.