Four people in three police communications centres have been disciplined for inappropriate behaviour since January last year.
In the most serious case, an employee in the central communications centre failed to record the details of 19 calls received during a two-week period.
Police say this inaction meant officers were not sent to investigate four or five reports that would usually require a response.
One case involved a car driving on the motorway at night without any lights on.
Another employee was disciplined for an unexplained absence, one for swearing at a caller, and a fourth accessed information on the police database.
Superintendent Kelvin Powell says their behaviour was picked up by routine checks.
The three centres received about 2 million calls in 2008. Of these, 685,732 were emergency calls.
Mr Powell says things have improved markedly since a review in 2005 prompted by cases such as that of a missing Auckland woman Iraena Asher.