Assigned DID disappears after a while

[EHammer98]

When i set my DID under call handling it works fine but after a while (seems te be a week or so) the assigned DID just disappears and the field is empty resulting in calls ending up in voicemail.
Does anyone also had this issue and may know how to resolve it?

Thanks!

 

[Charles_3CX]

With 3CX SMB free you must not assign the main trunk number to any other destination other than the group, doing so wil result in the behavior you are setting.

Leave the number where it is and configure the routing from the office hours section.