Bad audio quality during call

I called someone. The first time they could not hear me at all, the second time, I heard an echo of myself, and the other end complained about the bad audio quality.

I noticed that the phone kept the 4G icon in the status bar, but did have the exclamation mark in the mobile connection icon (see #454).

Here is the log file: bad_audio_quality_during_call.log

Note these lines in the log (from cat bad_audio_quality_during_call.log | grep -i audio):

Jan 06 16:11:22 avalon pulseaudio[867]: Configured maximum latency is smaller than latency, using latency instead
Jan 06 16:11:23 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:23 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:39 avalon pulseaudio[867]: Configured maximum latency is smaller than latency, using latency instead
Jan 06 16:11:39 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:39 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:39 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:39 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:11:39 avalon pulseaudio[867]: Doing resync
Jan 06 16:11:39 avalon pulseaudio[867]: Playback too far ahead (9907), drop source 1900
Jan 06 16:11:40 avalon pulseaudio[867]: Playback too far ahead (8990), drop source 1724
Jan 06 16:11:41 avalon pulseaudio[867]: Playback too far ahead (10065), drop source 1932
Jan 06 16:11:42 avalon pulseaudio[867]: Playback too far ahead (10344), drop source 1984
Jan 06 16:11:43 avalon pulseaudio[867]: Playback too far ahead (10195), drop source 1956
Jan 06 16:11:44 avalon pulseaudio[867]: Playback too far ahead (9790), drop source 1876
Jan 06 16:11:45 avalon pulseaudio[867]: Playback too far ahead (10049), drop source 1928
Jan 06 16:11:46 avalon pulseaudio[867]: Playback too far ahead (10050), drop source 1928
Jan 06 16:11:47 avalon pulseaudio[867]: Playback too far ahead (9900), drop source 1900
Jan 06 16:11:48 avalon pulseaudio[867]: Playback too far ahead (9926), drop source 1904
Jan 06 16:11:49 avalon pulseaudio[867]: Playback too far ahead (10239), drop source 1964
Jan 06 16:11:50 avalon pulseaudio[867]: Playback too far ahead (9945), drop source 1908
Jan 06 16:11:51 avalon pulseaudio[867]: Playback too far ahead (10370), drop source 1988
Jan 06 16:11:52 avalon pulseaudio[867]: Playback too far ahead (9632), drop source 1848
Jan 06 16:11:53 avalon pulseaudio[867]: Playback too far ahead (10115), drop source 1940
Jan 06 16:11:54 avalon pulseaudio[867]: Playback too far ahead (10179), drop source 1952
Jan 06 16:12:05 avalon pulseaudio[867]: Configured maximum latency is smaller than latency, using latency instead
Jan 06 16:12:05 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:05 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:11 avalon pulseaudio[867]: Configured maximum latency is smaller than latency, using latency instead
Jan 06 16:12:11 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:11 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:11 avalon pulseaudio[867]: Cannot set requested source latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:11 avalon pulseaudio[867]: Cannot set requested sink latency of 66.67 ms, adjusting to 32.00 ms
Jan 06 16:12:11 avalon pulseaudio[867]: Doing resync
Jan 06 16:12:11 avalon pulseaudio[867]: Playback after capture (-5410), drop sink 2152
Jan 06 16:12:12 avalon pulseaudio[867]: Playback after capture (-822), drop sink 392

See also this forum item.