Messages communication id

I have use case of generating message transcript which requires conversation id and communication id.
I am not able to understand what is communication id , as for some conversation , id from customer participant gives transcript url , for some conversation i have to take it from Agent participant .

For a recent conversation , i got the communication id from Workflow participant

Does 1 conversation have a unique communication id ? if yes then what is the best way to get it ?
if no then how is this generated

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