Cisco doesn't perform compatibility tests with each and every single release of the 3rd party PBXs, if Cisco tried an integration, it will be in the Cisco interoperability portal.
If it's not there, it was not tested by the BU, and you would need to POC this to find out if, and what, would work.
9.1.2 is also EOS/EOL, so there would be no support from Cisco.
HTH
java
if this helps, please rate