Multi frequency DTMF support - receiver side

webrtc/modules/audio_coding/acm2/rent_a_codec.cc

Index: webrtc/modules/audio_coding/acm2/rent_a_codec.cc
diff --git a/webrtc/modules/audio_coding/acm2/rent_a_codec.cc b/webrtc/modules/audio_coding/acm2/rent_a_codec.cc
index 9468f0c921a9eabf9425291f9753c5c6a4472f88..678769054451a0d103a2d1e928d03f84b43d9448 100644
--- a/webrtc/modules/audio_coding/acm2/rent_a_codec.cc
+++ b/webrtc/modules/audio_coding/acm2/rent_a_codec.cc
@@ -99,6 +99,15 @@ rtc::Optional<SdpAudioFormat> RentACodec::NetEqDecoderToSdpAudioFormat(
     case NetEqDecoder::kDecoderAVT:
       return rtc::Optional<SdpAudioFormat>(
           SdpAudioFormat("telephone-event", 8000, 1));
+    case NetEqDecoder::kDecoderAVT16kHz:
+      return rtc::Optional<SdpAudioFormat>(
+          SdpAudioFormat("telephone-event", 16000, 1));
+    case NetEqDecoder::kDecoderAVT32kHz:
+      return rtc::Optional<SdpAudioFormat>(
+          SdpAudioFormat("telephone-event", 32000, 1));
+    case NetEqDecoder::kDecoderAVT48kHz:
+      return rtc::Optional<SdpAudioFormat>(
+          SdpAudioFormat("telephone-event", 48000, 1));
     case NetEqDecoder::kDecoderCNGnb:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("cn", 8000, 1));
     case NetEqDecoder::kDecoderCNGwb: