Layer 3 - network layer.

The flasher module is attached to the bottom of the IP fuse block

A voice compression module can be used for either providing networking between sites over a wide area network or supporting IP Telephones and Soft phones.

You need to change the K134 Multifunction Relay module: The Multifunction Module under the IP(Under the Drivers side dashboard) . It is factory part number 90494163 and is around $85 plus tax at the dealer.

IP doesn't contain the logic needed to support the various user applications. For each type of application, such as file transfer, a separate module is needed that is peculiar to that application.