Bug 979716: drop opus bitrate to 16000bps to reduce mobile cpu use r=jmspeex

media/webrtc/signaling/src/sipcc/core/gsm/gsm_sdp.c

@@ -3461,7 +3461,7 @@ gsmsdp_negotiate_codec (fsmdef_dcb_t *dcb_p, cc_sdp_t *sdp_p,
                                audio_coding/main/source/acm_codec_database.cc */
                             payload_info->audio.frequency = 48000;
                             payload_info->audio.packet_size = 960;
-                            payload_info->audio.bitrate = 32000;
+                            payload_info->audio.bitrate = 16000; // Increase when we have higher capture rates
                             break;
 
                         case RTP_ISAC: