I have an CallManager 4.1(3)sr5b and I want to use an CallManager Express as SRST to provide some sites with more features in fallback mode.
Someone knows, if I can use version 4.0 or what version is more recommended to me?
I look through the CallManager compatibility matrix, and I cannot found this information.
Probably you can check the CME compatibility matrix.
This one is for 4.0:
It's compatible with CCM 4.1.3, so you can use it.
In this link you will find all the CME's compatibility info in case you want to check a later CME version:
Hope this helps! :)