Did not see this list on here so here you go.
IVR (Interactive Voice Response)
You can access this IVR by using a connected phone and pressing **** (the star button 4 times). You should then be greeted by the voice response asking you to place a command followed by the # (pound) sign.
A list of these commands are as follows:

100
DHCP Client status (whether or not the unit obtains its IP address by DHCP).

110
Announces the current IP address of the device.

101
Change DHCP client. (1 to enable, 0 to disable)

111
Assign the ATA a static IP address. To assign a static IP address, replace the dots in the IP address with the star key and then terminate with the pound key. (DHCP must be disabled, otherwise you will hear Invalid Option.)

120
Announces the subnet mask.

121
Used to set the subnet mask. (Use the same format as with 111 command.)

130
Announces the default route (gateway).

131
Sets the default gateway. (Use the same format as with 111 command.)

140
Announces the MAC address of the adapter.

160
Announces current setting of primary DNS Server.

150
Tells you the firmware version.

732668 (spells out REBOOT)
Reboots the ATA, resets all configurations back to default. Requires password.

I have not tested all of these but I am positive most of these do work.