Normally the CMS saves all kinds of data completely for a limited period. Make sure that you secure the data from this period, after which it will be written over.
Then engage with someone with expert CMS knowledge (Avaya, business partner, or user group expert), to assist you to get this information. If the info is there it can be found.
Normally Avaya would advice the use of logging equipment (Nice, Witness, Verint etc) to make searching for this information easier. Based on your question I assume this is an incident situation.
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