DDI (Direct Dialling In) is a telephone number that can be added to your 3CX account temporarily if you wish to give parents a telephone number to be contactable during a trip.This is primarily for trips abroad or in the UK (outside of school working hours.)Staff can use their 3CX app to call a parent at any time without a DDI, and it will display the school number.Trips during school hours, do not need a DDI as a parent can call school and reception can forward a call to your 3CX extension wherever you are. (assuming you give parents and reception that instruction/option.)Because this system uses data we do recommend where possible to be in a Wifi zone when making calls.Please give a minimum of 48 hours, preferably 1 week notice when requesting a DDI.