The national CSIRT can be contacted by e-mail (cert@cert.be) during office hours (09.30 to 16.30) from Monday to Friday, outside official closing days. The receipt of mails sent to the national CSIRT is automatically acknowledged within minutes. This automatic system gives a unique number to each report. It is not said that the CSIRT will systematically reply to the mail; this depends on the severity of the incident and the capacity of the correspondent.  In cooperation with the National Crisis Centre (NCCN) of the Ministry of the Interior, the national CSIRT can be reached by telephone around the clock to handle incidents for providers of essential services and critical infrastructures.