diff --git a/examples/server-tls.go b/examples/server-tls.go
index 93ffb408..180e805a 100644
--- a/examples/server-tls.go
+++ b/examples/server-tls.go
@@ -74,7 +74,7 @@ func handleConn(conn *gortsplib.ServerConn) {
 	}
 
 	// called after receiving a SETUP request.
-	onSetup := func(req *base.Request, th *headers.Transport) (*base.Response, error) {
+	onSetup := func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error) {
 		return &base.Response{
 			StatusCode: base.StatusOK,
 			Header: base.Header{
diff --git a/examples/server-udp.go b/examples/server-udp.go
index a15f57ef..efee9fda 100644
--- a/examples/server-udp.go
+++ b/examples/server-udp.go
@@ -73,7 +73,7 @@ func handleConn(conn *gortsplib.ServerConn) {
 	}
 
 	// called after receiving a SETUP request.
-	onSetup := func(req *base.Request, th *headers.Transport) (*base.Response, error) {
+	onSetup := func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error) {
 		return &base.Response{
 			StatusCode: base.StatusOK,
 			Header: base.Header{
diff --git a/examples/server.go b/examples/server.go
index e652a176..990a4b92 100644
--- a/examples/server.go
+++ b/examples/server.go
@@ -73,7 +73,7 @@ func handleConn(conn *gortsplib.ServerConn) {
 	}
 
 	// called after receiving a SETUP request.
-	onSetup := func(req *base.Request, th *headers.Transport) (*base.Response, error) {
+	onSetup := func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error) {
 		return &base.Response{
 			StatusCode: base.StatusOK,
 			Header: base.Header{
diff --git a/serverconf_test.go b/serverconf_test.go
index 96143adb..cd26600f 100644
--- a/serverconf_test.go
+++ b/serverconf_test.go
@@ -142,7 +142,7 @@ func (ts *testServ) handleConn(conn *ServerConn) {
 		}, nil
 	}
 
-	onSetup := func(req *base.Request, th *headers.Transport) (*base.Response, error) {
+	onSetup := func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error) {
 		return &base.Response{
 			StatusCode: base.StatusOK,
 			Header: base.Header{
diff --git a/serverconn.go b/serverconn.go
index 7bf955cf..1293b620 100644
--- a/serverconn.go
+++ b/serverconn.go
@@ -99,7 +99,7 @@ type ServerConnReadHandlers struct {
 	OnAnnounce func(req *base.Request, tracks Tracks) (*base.Response, error)
 
 	// called after receiving a SETUP request.
-	OnSetup func(req *base.Request, th *headers.Transport) (*base.Response, error)
+	OnSetup func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error)
 
 	// called after receiving a PLAY request.
 	OnPlay func(req *base.Request) (*base.Response, error)
@@ -444,7 +444,7 @@ func (sc *ServerConn) handleRequest(req *base.Request) (*base.Response, error) {
 				}
 			}
 
-			res, err := sc.readHandlers.OnSetup(req, th)
+			res, err := sc.readHandlers.OnSetup(req, th, trackID)
 
 			if res.StatusCode == 200 {
 				sc.tracksProtocol = &th.Protocol