Dear Sir/Mdm, Most of my office users are using 3CX smartphone client via WIFI, however users are still able to receive incoming calls when outside office via personal mobile data. We tested and confirmed the cause was due to External PBX IP on client configuration. We tried to remove it but the setting restores after phone re-provision itself automatically. Use of After office hour call setting is not preferred, as per my office operation it is common to work after office hours. My office is fine if user unable make call via 3CX when outside office WIFI coverage. Please advice what is the best way to avoid receiving incoming call when outside office WIFI coverage. Achieve this will benefit and convenience my office operation a lot. Appreciate and look forward to your guidance. Thanks.