Main menu:
Firmware
If you look through the WIP330's settings you will find an section called Auto-Provisioning (Menu/PhoneSettings/Auto-Provisioning). This is supposed to automatically check the firmware version on the phone against that on a Linksys server and then update itself. I myself have it turned off as I prefer to update my firmware by hand.
There are settings for
Server Type - http or https
Server Url - The address you download from
File - The firmware version to install
Resync on Reset - Update on reboot
However the file setting does not always show the latest firmware version or update itself correctly.
You can go to this address
https://voip.linksys.com/wip330/
to check for the latest file which you can enter into the File setting yourself.
You can also enter the Auto-Provisioning settings through the WIP330 GUI page (Administration/Auto Provision)
The correct settings should be:
Server Url: https://voip.linksys.com/wip330
Path and File Name: wip330_v1_03_18S.bin
Transmission Type: HTTPS
Resync On Reset: NO (or YES - to check for updates when rebooting)
Period: blank unless told otherwise (this is for scheduled update checks)
Decrypt Key: blank unless told otherwise (for encrypted files)
Confirm Key: blank unless told otherwise