diff --git a/ortc.go b/ortc.go
index 781e606..4bb1367 100644
--- a/ortc.go
+++ b/ortc.go
@@ -379,7 +379,7 @@ func generateRouterRtpCapabilities(mediaCodecs []RtpCodecCapability) (caps RtpCa
 				MimeType:             fmt.Sprintf("%s/rtx", codec.Kind),
 				PreferredPayloadType: pt,
 				ClockRate:            codec.ClockRate,
-				Parameters: RtpCodecSpecificParameters{
+				Parameters: &RtpCodecSpecificParameters{
 					Apt: codec.PreferredPayloadType,
 				},
 				RtcpFeedback: []RtcpFeedback{},
diff --git a/rtp_parameters.go b/rtp_parameters.go
index f7e791e..0e9a94c 100644
--- a/rtp_parameters.go
+++ b/rtp_parameters.go
@@ -86,7 +86,7 @@ type RtpCodecCapability struct {
 	 * and 'profile-level-id' in H264 or 'profile-id' in VP9) are critical for
 	 * codec matching.
 	 */
-	Parameters RtpCodecSpecificParameters `json:"parameters,omitempty"`
+	Parameters *RtpCodecSpecificParameters `json:"parameters,omitempty"`
 
 	/**
 	 * Transport layer and codec-specific feedback messages for this codec.
@@ -242,7 +242,7 @@ type RtpCodecParameters struct {
 	 * as 'packetization-mode' and 'profile-level-id' in H264 or 'profile-id' in
 	 * VP9) are critical for codec matching.
 	 */
-	Parameters RtpCodecSpecificParameters `json:"parameters,omitempty"`
+	Parameters *RtpCodecSpecificParameters `json:"parameters,omitempty"`
 
 	/**
 	 * Transport layer and codec-specific feedback messages for this codec.
diff --git a/supported_rtp_capabilities.go b/supported_rtp_capabilities.go
index fd23f5b..25b697c 100644
--- a/supported_rtp_capabilities.go
+++ b/supported_rtp_capabilities.go
@@ -165,7 +165,7 @@ var supportedRtpCapabilities = RtpCapabilities{
 			Kind:      "video",
 			MimeType:  "video/H264",
 			ClockRate: 90000,
-			Parameters: RtpCodecSpecificParameters{
+			Parameters: &RtpCodecSpecificParameters{
 				RtpParameter: h264.RtpParameter{
 					PacketizationMode:     1,
 					LevelAsymmetryAllowed: 1,
@@ -183,7 +183,7 @@ var supportedRtpCapabilities = RtpCapabilities{
 			Kind:      "video",
 			MimeType:  "video/H264",
 			ClockRate: 90000,
-			Parameters: RtpCodecSpecificParameters{
+			Parameters: &RtpCodecSpecificParameters{
 				RtpParameter: h264.RtpParameter{
 					PacketizationMode:     0,
 					LevelAsymmetryAllowed: 1,
@@ -201,7 +201,7 @@ var supportedRtpCapabilities = RtpCapabilities{
 			Kind:      "video",
 			MimeType:  "video/H265",
 			ClockRate: 90000,
-			Parameters: RtpCodecSpecificParameters{
+			Parameters: &RtpCodecSpecificParameters{
 				RtpParameter: h264.RtpParameter{
 					PacketizationMode:     1,
 					LevelAsymmetryAllowed: 1,
@@ -219,7 +219,7 @@ var supportedRtpCapabilities = RtpCapabilities{
 			Kind:      "video",
 			MimeType:  "video/H265",
 			ClockRate: 90000,
-			Parameters: RtpCodecSpecificParameters{
+			Parameters: &RtpCodecSpecificParameters{
 				RtpParameter: h264.RtpParameter{
 					PacketizationMode:     0,
 					LevelAsymmetryAllowed: 1,