Polycom VSX Series - Manual (Page 107)

Customizing the VSX System
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5. Select and select where to display Content.
6. Go to System > Admin Settings > Network > Call Preference.
7. Configure this setting:
To configure the content audio (VSX 7000e, VSX 8000):
1. Go to System > Admin Settings > Audio > Audio Settings.
2. Select two times and configure this setting:
Settings Description
Enable H.239 Enables H.239 People+Content. Select this option if you
know that H.239 is supported by the far sites you will call.
Note: If callers experience issues when sharing content with
other Polycom systems, clear Enable H.239.
Settings Description
Line Input Set Line Input to Visual Concert to share audio content.