Cisco DX650 User Manual page 36

Optimize Video Call Experience Over VPN
Speed test applications, such as Internet Speed Test by Speed A.I. are available in Google Play Store.
Step 3
Reconnect to VPN.
Step 4
In the Call application, tap
Step 5 Tap Settings.
Step 6
Tap Video bandwidth.
Step 7 Select a video bandwidth that is lower than the upload speed in the speed test results.
Cisco DX650 User Guide, Release 10.2(2)
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Customization and Settings