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srsRAN_4G
Open source SDR 4G software suite from Software Radio Systems (SRS) https://docs.srsran.com/projects/4g
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Some pointers that might be useful:
https://beej.us/guide/bgnet/
https://github.com/srsLTE/srsLTE
https://www.gnuradio.org/grcon/grcon17/presentations/open_fi...
https://en.wikipedia.org/wiki/Asterisk_(PBX)
Don’t be afraid to study the source code if you’re curious about the inner workings of a system. Best of luck!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.