CounterPath Bria 2.0 User Guide - Manual (Page 51)

Bria 2.0 for Windows
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Options – Network
Field Description
Use automatic bandwidth detection. Click the box to let Bria detect the speed of your network connection and hence
the potential bandwidth. If you move your computer to a different IP address,
Bria automatically detects the new speed.
Or select the type of network connection for your computer.
Preserve bandwidth When this feature is on, Bria stops sending audio when you are not talking.
When this feature is off, Bria always sends audio, which uses more bandwidth
but may result in better call quality.
Typically off. However, if you are using a slow (dial-up or ISDN) connection,
you may want to turn it on.