Power related parameters

 Measuring VoIP Quality with SIP and RTP (catchpoint.com)

rx gain, tx gain, slic gain

companding

DCProfile

1. A SIP-channel only patch that works for alaw/ulaw (a bit of a kludge)

2. A technology independent patch that works for all codecs[1] that adds
a SetGains(txgain,rxgain) function for adjusting incoming channels, and
adds a V(txgain:rxgain) flag to Dial() for outgoing channels (much less
of a kludge).

Range extenders - nordicsemi.com

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