Polycom RMX 1500 Administrator's Manual page 1053

2
On the File menu, click Add/Remove Snap-in.
The Add/Remove Snap-in dialog box opens.
3
In the Available snap-ins list, select Certificate Authority and then
click the Add button.
The Select Computer dialog box opens.
Polycom RMX 1500/2000/4000 Administrator's Guide
H-67