CCA Clear Channel Assessment for XBee ZigBee

, , , ,

I use the XBee ZigBee firmware on my XBee S2C modules.
I want to know how CCA works for them.

I found in the 802.15.4 manual (90001500) some details, but for the 802.15.4 there are also some settings available.

For the ZigBee manual version (90002002) there are no such settings available. The only reference to CCA is Transmit Status failure reason.

I would say that since XBee ZigBee is buit on top of 802.15.4 then CCA is by default used and configured.
Is this correct?
What are the default parameters? Those mentioned in the 802.15.4 manual?