In CCX you can get the Abandon call details from the Abandon call report from CUIC or Historical Report Client. But the point you have to understand is Abandon call can be listed in CUIC in two ways. If the Agent does not answer or The caller hang up after dialing into the IVR, both cases system marks the calls as abandoned.
For UCCX this below link can give you more info.
Hope this helps!
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