If the IP Office system is being used for DHCP support for the IP phones, various settings in the IP Office system's configuration are used to set the file server addresses sent to the phones in the DHCP responses.
Using either IP Office Manager or IP Office Web Manager in offline mode, load the system configuration.
Select SystemSystem or System SettingsSystem.
Check the file server settings. See System settings for file server support for details of the individual settings. These are used in DHCP responses provided by the system and when the system is asked to provide files.
If any changes have been made, save the configuration back to the system.