What is difference between sdr and cdr for call data?
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CDR or Call Detail Record is the voice channel. XDR is the data channel. For example, one difference is that CDRs encode 2 phone numbers and two antennas (in and out) for a call, while XDRs only contain one antenna (the one you're connected to and downloading information)... no "out" antenna or "out" phone number is nedded. Another difference is perhaps that you're not measured in how many minutes you burn, but how many KBs you down/upload. There are more details, but that's the gist of it
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