I have 7206VXR/NPE-400/2FE and PA-VXA-1TE1-30+
IOS 12.2(11)T ENTERPRISE
Does it work with G.723 codec ?
PA-VXA supported medium complexity . G723 is a higher complexity codec.
The following site list more information about the PA VXA. IT would be better to have it replaced with PA VXC or VXB.
Hope that helps.