Symptom:
There is no AXL compatibility guide. As per CSCup78196, Unity Connection 10.5 does not work with any pre-9.x CUCM versions.

Servers are installed or upgraded looking at just the SCCP and SIP compatibility guide. 

Need an AXL Compatibility Guide and a warning on the SCCP/SIP integration Guide pointing to the AXL Compatibility Guide.

SIP Compatibility Guide,
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/compatibility/matrix/cucsiptrunkmtx.html


SCCP Compatibility Guide,
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/compatibility/matrix/cucsccpmtx.html

Conditions:
Documentation update