Required columns: Call ID, Start Time, Caller, Caller Name
Optional columns: Call Direction, Callee, Callee Name, Forward, Forward Name, Outbound Caller ID, DID, Answer Time, End Time, Bridge Time, Call Second, Call Minute, Answer Second, Answer Minute, Callee Answer Second, Call Status, Currency, Incoming Charges, Outgoing Charges, Hangup By, Hangup Reason, Inbound Trunk, Outbound Trunk, Unique Token, Caller Location(Coordinates), Callee Location, Call Record Path, DID Sell Pulse, Gateway, Sell Pulse, DID Pack Pulse, Gateway Pack Pulse, DID Sell Duration (sec), Gateway Sell Duration (sec), DID Pack Duration (sec), Gateway Pack Duration (sec), DID Sell Billed Minute, Gateway Sell Billed Minute, DID Pack Billed Minute, Gateway Pack Billed Minute