CALL LOG EXTRACT TECHNICAL DOCUMENTATION
The fields are
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calldate: date and time of the call
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clid: the number and name of the caller
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src: the number of the caller
Destination
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dcontext: the context in which the call ends up – it is a system-specific thing that doesn’t have much meaning to humans. The values in that field can be many things such as ext-local: a user’s extension ext-group: a ring group
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lastapp: the system application that was last used by the call
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duration: the length of the call
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disposition: how the call ended
By looking at the last app and disposition it's possible to determine what happened to a call. For example:
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Voicemail NO ANSWER: This call went to voicemail eventually after not being answered
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Voicemail BUSY: This call went to voicemail eventually but at least one phone was busy before it went there
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Voicemail ANSWERED: An internal call from one extension to another and the call ended at voicemail.
Note that for one call there may be multiple entries in the log for example where a call goes to a queue or a ring group.