Linksys VONAGE PAP2 Ver. 2 Installation And Troubleshooting Manual page 26

Phone Adapter with 2 Ports for Voice-over-IP
Optional Settings
Host Name and Domain Name. These fields allow you to supply a host and domain name for the Phone
Adapter. In most cases, leaving these fields blank will work.
MTU. The MTU (Maximum Transmission Unit) setting specifies the largest packet size permitted for network
transmission. Select Auto to have the Phone Adapter automatically select the MTU value, or select Manual and
enter the value desired. It is recommended that you leave this value in the 1200 to 1500 range. The MTU's default
value is 1500.
When you have finished making changes to this screen, click the Save Settings button to save the changes, or
click the Cancel Changes button to undo your changes.
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packet: a unit of data sent over
a network.
Chapter 5: Using the Phone Adapter's Web-based Utility
The Setup Tab