What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal?

Explanation

Speech is a highly peaky waveform: brief vowel peaks drive the transmitter to full output while the average over a syllable is much lower, so an unprocessed single-sideband signal averages roughly 2.5 times below its peak envelope power. Speech processing raises the average and lowers the ratio; the other figures are far outside anything voice waveforms produce.