The manager is running as a tftp-server for new IP-Phones to get there firmware, but if al phone,s are running you don,n need the manager to be running.
TFTP Server IP Address: Default = Blank
When Manager is running, it acts as a TFTP server for the IP Office Control Unit. An entry is only required here if you want to force the Control Unit to use a particular device as its TFTP server. This field must be filled in with the IP address of the PC running Manager on systems using 4600 Series IP phones. On Avaya IP Office - Small Office Edition systems this can be the IP Address of the control unit if fitted with a local memory storage card.
Greets peter