The Fire Service hopes to resolve problems with its emergency communications system by early in the new year, a spokesman says.
On the back of recent failures, the Fire Service Commission has announced an independent inquiry to try to establish why the problems have occurred.
It's understood they are largely to do with mapping glitches.
The system uses the Police communications computer system to log emergency calls and to mobilise fire engines. The communications centres, which are located with Police control rooms, also handle radio traffic with fire engines.
Commission chairman Roger Estall says the timing of the inquiry involves balancing the need to find out why such a large project has encountered significant problems against the need not to distract the project team from remedial work.