Over saturated air. Becoming audible.

All,
The more we keep narrowing the frequency spectrum as well as applying aggregation and beamforming, the closer and closer we get to audible interference. In metropolitan areas, that rining is not tinnitus. Just conceptual theory mixed with real happening.

Softphones will solve a majority of issues.

Beamforming and related methodology is not bad at all. Its the wave of the future. But voice calls on voice frequencies need to go bye bye.