Polycom MGC-25 Getting Started Manual page 79

10. Click the Settings tab.
The Properties - Settings dialog box opens.
Parameters in the Conference Properties - Settings dialog box are
grouped in two main panes: General Settings and Media Settings. By
default, only the Basic settings in these panes are displayed when you
first open the dialog box. You can click the Advanced (>>) button to
view and modify the additional settings. In most conference definitions
you do not need to modify the Advanced parameters because the MGC
Manager uses default values, or uses the optimal parameters based on the
endpoint's capabilities.
11. Select the Enable IVR Service check box to enable an IVR service. The
IVR Service includes a set of voice prompts that assist participants to
dial the conference dial-in numbers and use the telephone keypad to
input the required information to connect to the conference.
Chapter 6 - Defining a New Audio Conference
6-7