- Introduced new config variables 'opus_samplerate', 'opus_stereo',

and 'opus_sprop_stereo'.
- Set 'opus_samplerate' to 16000 and 'opus[_sprop]_stereo' to "no" in order
  to support acoustic echo cancellation also when opus codec is in use.
- Renamed 'prefer_ipv6' config variable to 'net_prefer_ipv6'.

app/src/main/assets/config

@@ -19,7 +19,7 @@ rtcp_mux no
 jitter_buffer_delay 5-10
 rtp_stats no
 dyn_dns yes
-prefer_ipv6 no
+net_prefer_ipv6 no
 module ilbc.so
 module g7221.so
 module g711.so
@@ -39,9 +39,12 @@ module_app debug_cmd.so
 module_app mwi.so
 evdev_device /dev/input/event0
 opus_bitrate 28000
+opus_samplerate 16000
 opus_cbr no
 opus_inbandfec yes
 opus_application voip
+opus_stereo no
+opus_sprop_stereo no
 ice_turn no
 ice_debug no
 ice_nomination regular