| Index: webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc | 
| diff --git a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc | 
| index 328181428bb6bc4eb7af21188222615915b20344..b31092cb1129427ac05a495b4966797a081dc733 100644 | 
| --- a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc | 
| +++ b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc | 
| @@ -259,7 +259,8 @@ AudioEncoder* RentACodec::RentEncoderStack(AudioEncoder* speech_encoder, | 
| : rtc::Optional<int>(it->second); | 
| }; | 
| auto cng_pt = pt(param->cng_payload_types); | 
| -  param->use_cng = param->use_cng && cng_pt; | 
| +  param->use_cng = | 
| +      param->use_cng && cng_pt && speech_encoder->NumChannels() == 1; | 
| auto red_pt = pt(param->red_payload_types); | 
| param->use_red = param->use_red && red_pt; | 
|  | 
|  |