Are you sure about that Leonidas? I have my regional settings set to the default north american settings (which is 12-hour AM/PM format) - and the soft phone still displays everything in 24-hour format.
For me, I actually PREFER 24-hour format - but for most folks, that doesn't fly. Any thoughts?
3CXPhone always displays time in 24-hr format, regardless computer's time diplaying format (for both of them, it's just a display mode). However, option to choose between 12-24-hr formats will be available in the next major release.