diff --git a/src/Extension/G711.h b/src/Extension/G711.h
index bcf5f677..550acbc4 100644
--- a/src/Extension/G711.h
+++ b/src/Extension/G711.h
@@ -22,7 +22,7 @@ namespace mediakit{
 class G711Track : public AudioTrackImp{
 public:
     using Ptr = std::shared_ptr<G711Track>;
-    G711Track(CodecId codecId,int sample_rate, int channels, int sample_bit) : AudioTrackImp(codecId,sample_rate,channels,sample_bit){}
+    G711Track(CodecId codecId, int sample_rate, int channels, int sample_bit) : AudioTrackImp(codecId, 8000, 1, 16) {}
 
 private:
     Sdp::Ptr getSdp() override;