My company is migrating from an Executone PBX to a panasonic TDE-100 PBX. Currently, all extensions are 4 digit, starting at 3001 and going upwards.
It appears that the extension numbers in our TDE-100 are preassigned starting at 101 and upward, jumping around a bit depending on which slot/port and port type is associated with that extension.
When I try to manually type over with 4 digit extensions, I receive an error that states E000404 "Invalid extension number was entered (Extension block error)".

How can I assign new 4 digit extension numbers?
Thanks in advance for your help!!!