diff --git a/conf/config.ini b/conf/config.ini
index 8f566338..3c8b67c8 100644
--- a/conf/config.ini
+++ b/conf/config.ini
@@ -357,7 +357,7 @@ tcpPort = 8000
 rembBitRate=0
 #rtc支持的音频codec类型,在前面的优先级更高
 #以下范例为所有支持的音频codec
-preferredCodecA=PCMU,PCMA,opus,mpeg4-generic
+preferredCodecA=PCMA,PCMU,opus,mpeg4-generic
 #rtc支持的视频codec类型,在前面的优先级更高
 #以下范例为所有支持的视频codec
 preferredCodecV=H264,H265,AV1,VP9,VP8
diff --git a/webrtc/Sdp.cpp b/webrtc/Sdp.cpp
index bed1bf57..55f94e38 100644
--- a/webrtc/Sdp.cpp
+++ b/webrtc/Sdp.cpp
@@ -23,7 +23,7 @@ namespace Rtc {
 const string kPreferredCodecA = RTC_FIELD"preferredCodecA";
 const string kPreferredCodecV = RTC_FIELD"preferredCodecV";
 static onceToken token([]() {
-    mINI::Instance()[kPreferredCodecA] = "PCMU,PCMA,opus,mpeg4-generic";
+    mINI::Instance()[kPreferredCodecA] = "PCMA,PCMU,opus,mpeg4-generic";
     mINI::Instance()[kPreferredCodecV] = "H264,H265,AV1,VP9,VP8";
 });
 }