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BER testing tool
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* Check all configs (MSC/BSC/BTS) for proper codec support
- FR enabled
- EFR enabled
- AMR 12.2 enabled (and all other modes disabled !)
- Use `amr-payload octet-aligned` in BSC config
* Check BTS config
- Disable jitter buffer : `bts N / rtp jitter-buffer 0`
* Check BSC config
- Disable radio timeout : `network / bts n / radio-link-timeout infinite`
* Start BER testing tool
- `./rtp_ber 4000`
* On the MSC CLI, start a silent-call, then request GSM to test loop
- `subscriber imsi <XXX> silent-call start tch/f speech-amr`
- `subscriber imsi <XXX> ms-test close-loop b`
Don't forget to terminate the loop and terminate the silent call !
- `subscriber imsi <XXX> ms-test open-loop`
- `subscriber imsi <XXX> silent-call stop`
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