Adjust bit rates based on network congestion

Hi,

>From the helix mobile server web site, it has this
feature:



MAXIMIZE END-TO-END BANDWIDTH UTILIZATION
Helix Mobile Server can automatically adjust data bit-rates
based on
network congestion to provide a better experience for your
customers.
The result is increased media service usage and higher value
for your
mobile customers.

Can you please tell me if that feature only exists in Helix
Mobile Server ?
Or it is in the open source version as well?

Thank you.

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