Location Virtual Extension number length too

Location Virtual Extension number length too short

We are using Webex Calling and would like to program in the phone numbers of the top 100 customers for each branch into the Virtual Extensions for the Location. This will allow their name to appear on the phone when they call us.

But when I try configuring a Virtual Extension as the callers phone number in Webex Calling it brings up the message "Location extensions can contain only 2-6 numbers in length".

Please increase the number length of Virtual Extensions in Locations to be similar to Virtual Extensions for the whole Organisation.