This is the only reference doc that describes the interaction between Call Park and CDR Records that I could find;
Call Park will generate two CDRs, one for the original call that is parked and another for the call that is picked up or reverted. These CDRs will have the same globalCallID_callId.
When the call is parked, the call gets split. The original call generates a CDR. The origTerminationOnBehalfOf and destTerminationOnBehalfOf fields get set to (Call Park = 3) for this CDR.
When the parked call is retrieved, the user goes off hook and enters the park code. This call joins with the parked call. Because the user picking up is joined with the parked call, the system treats the user as the originator of the call, and the parked user gets treated as the destination. This means that the callingPartyNumber of the call contains the directory number of the user who is picking up the call and the originalCalledNumber and finalCalledNumber contain the directory number of the parked user. The lastRedirectDn contains the park code that is used to pick up the call. The lastRedirectRedirectReason specifies (Call Park Pickup = 8). The lastRedirectRedirectOnBehalfOf should specify (Call Park = 3).
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