Polycom RMX 1500 Administrator's Manual page 1008

Appendix H-Setting the RMX for Integration Into Microsoft Environment
H-22
If you have not defined such a prefix in the IP Network Service in the
RMX configuration, you can add it later, using value entered here.
7
In the Gateways - Addresses box, click the Add button.
The Add Route Gateway dialog box opens.
8
Select the RMX gateway address that was set up in "Configuring the
RMX as a Routable Gateway" in step 14 that appears in the drop down
list of gateways.
9
Click OK to save the address and return to the Add Route dialog box.
10 In the Phone Usage box, click the Configure button.
The Configure Phone Usage Records dialog box opens.