The telephone database predialling function intended to select existing phone numbers has been rebuilt. A new predialling option has been added that selects phone numbers with recorded call answer attempts. This improves the quality of the database, in particular with mobile phone numbers.

If this option is enabled, some call statuses will be affected:

  • W - Call has been answered
  • O - The call has been answered very quickly (by various automatic equipment – the answering time can be configured)
  • N - The call has not been answered (this includes erroneous response statuses from mobile phone operators’ exchanges)
  • B - Line was busy
  • F - The number is invalid
  • U - Connection failed

The W status is the most valuable, because the call has been answered within the time defined in the exchange configuration for the project. Phone numbers with the B status (line busy) can also be used, however in this case one can not be sure whether numbers are valid (active). The N status, caused by erroneous reporting from operator exchanges may be difficult to use.