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Android versions prior to 4.1 have poor audio latency, which is reflected in the Serval Mesh user experience. Android 4.1 or newer has an improved API that can greatly reduce the audio latency.
As related tasks, any of the following improvements would reduce the network bandwidth required to carry voice calls:
The combined result should be greatly improved audio quality in mesh voice calls.
This technology was first developed in the first half of 2013 as a student project.