Drop the CSV your PBX exports: columns are detected, and you get ASR, ACD, peak hour and the most frequent numbers. A call export holds phone numbers — this one never leaves your browser.
No. A CDR holds phone numbers, so personal data: the file is read in your browser and never leaves it. No network request carries your data.
Any CSV. The delimiter is sniffed (comma, semicolon, tab), quoting is honoured, and the Windows-1252 encoding of French exports is recognised automatically. Columns are detected, and you can correct the detection when it gets one wrong.
ASR (Answer Seizure Ratio) is the share of calls that connect. ACD (Average Call Duration) is the mean conversation length, computed over the calls that actually carry a duration.
It is what sizes a SIP trunk, not the daily average: a trunk sized on an average saturates at busy times. Peak-hour call count and ACD are exactly the two inputs of the Erlang B calculation.