diff --git a/include/rtc/rtc.h b/include/rtc/rtc.h
index ba0ed037a..0210a0f2c 100644
--- a/include/rtc/rtc.h
+++ b/include/rtc/rtc.h
@@ -275,10 +275,7 @@ typedef struct {
 	const char *name;    // optional
 	const char *msid;    // optional
 	const char *trackId; // optional, track ID used in MSID
-
-	//indicate the coder capability and configuration
-	//e.g: aac latm streammuxconfig
-	const char *profile;
+	const char *profile; // optional, codec profile
 } rtcTrackInit;
 
 RTC_C_EXPORT int rtcSetTrackCallback(int pc, rtcTrackCallbackFunc cb);
diff --git a/src/capi.cpp b/src/capi.cpp
index f105d3fde..d494096e4 100644
--- a/src/capi.cpp
+++ b/src/capi.cpp
@@ -1036,6 +1036,12 @@ int rtcAddTrackEx(int pc, const rtcTrackInit *init) {
 			}
 		}
 
+		int pt = init->payloadType;
+
+		optional<string> profile;
+		if (init->profile)
+			profile.emplace(string(init->profile));
+
 		optional<Description::Media> optDescription = nullopt;
 
 		switch (init->codec) {
@@ -1046,16 +1052,16 @@ int rtcAddTrackEx(int pc, const rtcTrackInit *init) {
 			auto desc = Description::Video(mid, direction);
 			switch (init->codec) {
 			case RTC_CODEC_H264:
-				desc.addH264Codec(init->payloadType);
+				desc.addH264Codec(pt, profile);
 				break;
 			case RTC_CODEC_H265:
-				desc.addH265Codec(init->payloadType);
+				desc.addH265Codec(pt, profile);
 				break;
 			case RTC_CODEC_VP8:
-				desc.addVP8Codec(init->payloadType);
+				desc.addVP8Codec(pt, profile);
 				break;
 			case RTC_CODEC_VP9:
-				desc.addVP9Codec(init->payloadType);
+				desc.addVP9Codec(pt, profile);
 				break;
 			default:
 				break;
@@ -1070,18 +1076,16 @@ int rtcAddTrackEx(int pc, const rtcTrackInit *init) {
 			auto desc = Description::Audio(mid, direction);
 			switch (init->codec) {
 			case RTC_CODEC_OPUS:
-				desc.addOpusCodec(init->payloadType);
+				desc.addOpusCodec(pt, profile);
 				break;
 			case RTC_CODEC_PCMU:
-				desc.addPCMUCodec(init->payloadType);
+				desc.addPCMUCodec(pt, profile);
 				break;
 			case RTC_CODEC_PCMA:
-				desc.addPCMACodec(init->payloadType);
+				desc.addPCMACodec(pt, profile);
 				break;
 			case RTC_CODEC_AAC:
-				desc.addAacCodec(init->payloadType, init->profile
-				                                        ? std::make_optional(string(init->profile))
-				                                        : nullopt);
+				desc.addAacCodec(pt, profile);
 				break;
 			default:
 				break;