Polycom 1500 Administrator's Manual page 1053

RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator's Guide
2 Right-click the endpoint and select Properties.
The Properties dialog box opens.
3 Click the Communications tab.
4 Click the Telephony Settings - Configure button.
The Telephony Options dialog box opens.
5 Select the Enable Enterprise Voice option.
6 Click OK to return to the Properties - Communications dialog box.
7 Click OK.
Polycom®, Inc. 1021