The TFTP address must match the ICP IP address
configured on the physical phone.
Press Volume Up and Down keys in together.
Release one (either up or down)
Press CFG / 234 (for config menu)
NETWORK Configuration.
Press "#" (NO) until you get to "Modify Static Values?"
Press "*" to edit the static values.
Press the DOWN VOLUME key to scroll through the options until you get to
"TFTP IP Address" is displayed.
Enter the SRC IP Address. Press "#" where a dot has to go.
If you blank this value out, then the PBX will be used again in place of the SRC.
Press DOWN VOLUME until "Store changes" is displayed.
Press "*" to save. Wait for the save to finish and then let the phone reboot.