@grandstream, please be aware that I have found a roadblock on this firmware with respect to creating new extensions via the Import Facility. This is documented in Ticket 20190919135151, but I’m posting it here so that others don’t get caught.
You used to be able to create a bunch of dummy extensions on the UCM with the general parameters you wanted, download the CSV file, delete the extensions, then edit the extension numbers, etc. and then re-upload the file to create the extensions (and extension numbers) you wanted. This is no longer possible as a simple process.
In order to do this, you need to edit each record in the “Follow me” field so that it matches the specific extension number you are creating. If you don’t, the file will be rejected.
I do not know when this changed, but it is a fact of life in the 188.8.131.52 firmware.
I have put in an enhancement request to allow this field to be blank so at to avoid a lot of manual editing, especially if you have a large number of extensions (I was dealing with over 60 at the time I found this).
Please add your thoughts to this.