Are you analysing the MD110 SMDR ASCII outputs or Call Accounting Device reports?.
Do you know the "Condition code" on the Call record in Question ?
If it's a standalone site it might be worth considering externally transferred calls.( T condition Code ) Transferred calls provide 3 call records.
1. incoming call component ,
2. outgoing call component
3. Information record that lists most details except the dialled number
This 3rd record is really an information only record and won't effect billing reconcilliation but can be misinterpreted buy some Call Accounting packages as an outgoing call with no dialled number.
I in 10 calls does sound a bit too high for this type of call though .
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