CUCM compatibility with UCCX 10.6

[Jahangir Tahirov]

Hello, we have an on-prem Cisco UC environment & planning to upgrade CUCM to 12.5.  Does CUCM 12.5 will compatible below applications or we must upgrade them also?

CUCM System version: 11.0.1.20000-2
UCCX System version: 10.6.1.10000-39 (cucm11-compatible-14)
IM&P System version: 11.0.1.10000-6
Expressway-c X8.6.1
Expressway-e X8.6.1

[Roger Kallberg]

Look in the CSR compatibility matrix. What you ask for is listed in it.

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/unified/communications/system/Compatibility/CSR-Compatibility-Matrix-InteractiveHTML.html

In general none of the versions you have listed is compatible with CM 12.5, so you'd need to update all of them.