diff --git a/README.md b/README.md
index 72b4c6d5..703f04d5 100644
--- a/README.md
+++ b/README.md
@@ -5,14 +5,13 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/aler9/rtsp-simple-server)](https://goreportcard.com/report/github.com/aler9/rtsp-simple-server)
 [![Docker Hub](https://img.shields.io/badge/docker-aler9%2Frtsp--simple--server-blue)](https://hub.docker.com/r/aler9/rtsp-simple-server)
 
-_rtsp-simple-server_ is a simple, ready-to-use and zero-dependency RTSP server and RTSP proxy, a software that allows multiple users to publish and read live video and audio streams. RTSP is a standardized protocol that defines how to perform these operations with the help of a server, that is contacted by both readers and publishers in order to negotiate a streaming protocol. The server is then responsible of relaying the publisher streams to the readers.
+_rtsp-simple-server_ is a simple, ready-to-use and zero-dependency RTSP server and RTSP proxy, a software that allows multiple users to publish and read live video and audio streams over time. RTSP, RTP and RTCP are standardized protocol that describe how to perform these operations with the help of a server, that is contacted by both readers and publishers in order to negotiate a streaming protocol. The server is then responsible of relaying the publisher streams to the readers.
 
 Features:
 * Read and publish streams via UDP and TCP
 * Pull and serve streams from other RTSP servers (RTSP proxy)
 * Each stream can have multiple video and audio tracks, encoded in any format
 * Publish multiple streams at once, each in a separate path, that can be read by multiple users
-* Supports the RTP/RTCP streaming protocol
 * Supports authentication
 * Supports running a script when a client connects or disconnects
 * Compatible with Linux, Windows and Mac, does not require any dependency or interpreter, it's a single executable
diff --git a/main.go b/main.go
index e71c37b2..bfc3bd53 100644
--- a/main.go
+++ b/main.go
@@ -104,13 +104,6 @@ type programEventClientPlay2 struct {
 
 func (programEventClientPlay2) isProgramEvent() {}
 
-type programEventClientPause struct {
-	res    chan error
-	client *serverClient
-}
-
-func (programEventClientPause) isProgramEvent() {}
-
 type programEventClientRecord struct {
 	res    chan error
 	client *serverClient
@@ -119,8 +112,8 @@ type programEventClientRecord struct {
 func (programEventClientRecord) isProgramEvent() {}
 
 type programEventClientFrameUdp struct {
-	trackFlowType trackFlowType
 	addr          *net.UDPAddr
+	trackFlowType trackFlowType
 	buf           []byte
 }
 
@@ -544,54 +537,22 @@ outer:
 			evt.client.state = _CLIENT_STATE_PLAY
 			evt.res <- nil
 
-		case programEventClientPause:
-			p.receiverCount -= 1
-			evt.client.state = _CLIENT_STATE_PRE_PLAY
-			evt.res <- nil
-
 		case programEventClientRecord:
 			p.publisherCount += 1
 			evt.client.state = _CLIENT_STATE_RECORD
 			evt.res <- nil
 
 		case programEventClientFrameUdp:
-			// find publisher and track id from ip and port
-			cl, trackId := func() (*serverClient, int) {
-				for _, pub := range p.publishers {
-					cl, ok := pub.(*serverClient)
-					if !ok {
-						continue
-					}
-
-					if cl.streamProtocol != _STREAM_PROTOCOL_UDP ||
-						cl.state != _CLIENT_STATE_RECORD ||
-						!cl.ip().Equal(evt.addr.IP) {
-						continue
-					}
-
-					for i, t := range cl.streamTracks {
-						if evt.trackFlowType == _TRACK_FLOW_TYPE_RTP {
-							if t.rtpPort == evt.addr.Port {
-								return cl, i
-							}
-						} else {
-							if t.rtcpPort == evt.addr.Port {
-								return cl, i
-							}
-						}
-					}
-				}
-				return nil, -1
-			}()
-			if cl == nil {
+			client, trackId := p.findPublisher(evt.addr, evt.trackFlowType)
+			if client == nil {
 				continue
 			}
 
-			cl.udpLastFrameTime = time.Now()
-			p.forwardTrack(cl.path, trackId, evt.trackFlowType, evt.buf)
+			client.udpLastFrameTime = time.Now()
+			p.forwardFrame(client.path, trackId, evt.trackFlowType, evt.buf)
 
 		case programEventClientFrameTcp:
-			p.forwardTrack(evt.path, evt.trackId, evt.trackFlowType, evt.buf)
+			p.forwardFrame(evt.path, evt.trackId, evt.trackFlowType, evt.buf)
 
 		case programEventStreamerReady:
 			evt.streamer.ready = true
@@ -611,7 +572,7 @@ outer:
 			}
 
 		case programEventStreamerFrame:
-			p.forwardTrack(evt.streamer.path, evt.trackId, evt.trackFlowType, evt.buf)
+			p.forwardFrame(evt.streamer.path, evt.trackId, evt.trackFlowType, evt.buf)
 
 		case programEventTerminate:
 			break outer
@@ -642,9 +603,6 @@ outer:
 			case programEventClientPlay2:
 				evt.res <- fmt.Errorf("terminated")
 
-			case programEventClientPause:
-				evt.res <- fmt.Errorf("terminated")
-
 			case programEventClientRecord:
 				evt.res <- fmt.Errorf("terminated")
 			}
@@ -672,27 +630,60 @@ func (p *program) close() {
 	<-p.done
 }
 
-func (p *program) forwardTrack(path string, id int, trackFlowType trackFlowType, frame []byte) {
+func (p *program) findPublisher(addr *net.UDPAddr, trackFlowType trackFlowType) (*serverClient, int) {
+	for _, pub := range p.publishers {
+		cl, ok := pub.(*serverClient)
+		if !ok {
+			continue
+		}
+
+		if cl.streamProtocol != _STREAM_PROTOCOL_UDP ||
+			cl.state != _CLIENT_STATE_RECORD ||
+			!cl.ip().Equal(addr.IP) {
+			continue
+		}
+
+		for i, t := range cl.streamTracks {
+			if trackFlowType == _TRACK_FLOW_TYPE_RTP {
+				if t.rtpPort == addr.Port {
+					return cl, i
+				}
+			} else {
+				if t.rtcpPort == addr.Port {
+					return cl, i
+				}
+			}
+		}
+	}
+	return nil, -1
+}
+
+func (p *program) forwardFrame(path string, trackId int, trackFlowType trackFlowType, frame []byte) {
 	for c := range p.clients {
 		if c.path == path && c.state == _CLIENT_STATE_PLAY {
 			if c.streamProtocol == _STREAM_PROTOCOL_UDP {
 				if trackFlowType == _TRACK_FLOW_TYPE_RTP {
-					p.udplRtp.write(&net.UDPAddr{
-						IP:   c.ip(),
-						Zone: c.zone(),
-						Port: c.streamTracks[id].rtpPort,
-					}, frame)
-
+					p.udplRtp.write(&udpAddrBufPair{
+						addr: &net.UDPAddr{
+							IP:   c.ip(),
+							Zone: c.zone(),
+							Port: c.streamTracks[trackId].rtpPort,
+						},
+						buf: frame,
+					})
 				} else {
-					p.udplRtcp.write(&net.UDPAddr{
-						IP:   c.ip(),
-						Zone: c.zone(),
-						Port: c.streamTracks[id].rtcpPort,
-					}, frame)
+					p.udplRtcp.write(&udpAddrBufPair{
+						addr: &net.UDPAddr{
+							IP:   c.ip(),
+							Zone: c.zone(),
+							Port: c.streamTracks[trackId].rtcpPort,
+						},
+						buf: frame,
+					})
 				}
 
 			} else {
-				c.writeFrame(trackFlowTypeToInterleavedChannel(id, trackFlowType), frame)
+				c.writeFrame(trackFlowTypeToInterleavedChannel(trackId, trackFlowType), frame)
 			}
 		}
 	}
diff --git a/server-client.go b/server-client.go
index 1e54d399..23dff185 100644
--- a/server-client.go
+++ b/server-client.go
@@ -53,24 +53,23 @@ func (cs serverClientState) String() string {
 }
 
 type serverClient struct {
-	p                    *program
-	conn                 *gortsplib.ConnServer
-	state                serverClientState
-	path                 string
-	authUser             string
-	authPass             string
-	authHelper           *gortsplib.AuthServer
-	authFailures         int
-	streamSdpText        []byte       // filled only if publisher
-	streamSdpParsed      *sdp.Message // filled only if publisher
-	streamProtocol       streamProtocol
-	streamTracks         []*track
-	udpLastFrameTime     time.Time
-	udpCheckStreamTicker *time.Ticker
-	readBuf              *doubleBuffer
-	writeBuf             *doubleBuffer
+	p                *program
+	conn             *gortsplib.ConnServer
+	state            serverClientState
+	path             string
+	authUser         string
+	authPass         string
+	authHelper       *gortsplib.AuthServer
+	authFailures     int
+	streamSdpText    []byte       // only if publisher
+	streamSdpParsed  *sdp.Message // only if publisher
+	streamProtocol   streamProtocol
+	streamTracks     []*track
+	udpLastFrameTime time.Time
+	readBuf          *doubleBuffer
+	writeBuf         *doubleBuffer
 
-	writeChan chan *gortsplib.InterleavedFrame
+	writeChan chan *gortsplib.InterleavedFrame // only if state = _CLIENT_STATE_PLAY
 	done      chan struct{}
 }
 
@@ -82,11 +81,9 @@ func newServerClient(p *program, nconn net.Conn) *serverClient {
 			ReadTimeout:  p.conf.ReadTimeout,
 			WriteTimeout: p.conf.WriteTimeout,
 		}),
-		state:     _CLIENT_STATE_STARTING,
-		readBuf:   newDoubleBuffer(512 * 1024),
-		writeBuf:  newDoubleBuffer(2048),
-		writeChan: make(chan *gortsplib.InterleavedFrame),
-		done:      make(chan struct{}),
+		state:   _CLIENT_STATE_STARTING,
+		readBuf: newDoubleBuffer(512 * 1024),
+		done:    make(chan struct{}),
 	}
 
 	go c.run()
@@ -126,29 +123,30 @@ func (c *serverClient) run() {
 		}
 	}
 
+outer:
 	for {
-		req, err := c.conn.ReadRequest()
-		if err != nil {
-			if err != io.EOF {
-				c.log("ERR: %s", err)
+		switch c.state {
+		case _CLIENT_STATE_PLAY:
+			ok := c.runPlay()
+			if !ok {
+				break outer
 			}
-			break
-		}
 
-		ok := c.handleRequest(req)
-		if !ok {
-			break
+		case _CLIENT_STATE_RECORD:
+			ok := c.runRecord()
+			if !ok {
+				break outer
+			}
+
+		default:
+			ok := c.runNormal()
+			if !ok {
+				break outer
+			}
 		}
 	}
 
-	if c.udpCheckStreamTicker != nil {
-		c.udpCheckStreamTicker.Stop()
-	}
-
-	go func() {
-		for range c.writeChan {
-		}
-	}()
+	c.conn.NetConn().Close() // close socket in case it has not been closed yet
 
 	func() {
 		if c.p.conf.PostScript != "" {
@@ -160,16 +158,185 @@ func (c *serverClient) run() {
 		}
 	}()
 
-	done := make(chan struct{})
-	c.p.events <- programEventClientClose{done, c}
-	<-done
-
-	close(c.writeChan)
-	c.conn.NetConn().Close() // close socket in case it has not been closed yet
-
 	close(c.done) // close() never blocks
 }
 
+var errClientChangeRunMode = errors.New("change run mode")
+var errClientTerminate = errors.New("terminate")
+
+func (c *serverClient) runNormal() bool {
+	var ret bool
+
+outer:
+	for {
+		req, err := c.conn.ReadRequest()
+		if err != nil {
+			if err != io.EOF {
+				c.log("ERR: %s", err)
+			}
+			ret = false
+			break outer
+		}
+
+		err = c.handleRequest(req)
+		switch err {
+		case errClientChangeRunMode:
+			ret = true
+			break outer
+
+		case errClientTerminate:
+			ret = false
+			break outer
+		}
+	}
+
+	if !ret {
+		done := make(chan struct{})
+		c.p.events <- programEventClientClose{done, c}
+		<-done
+	}
+
+	return ret
+}
+
+func (c *serverClient) runPlay() bool {
+	if c.streamProtocol == _STREAM_PROTOCOL_TCP {
+		writeDone := make(chan struct{})
+		go func() {
+			defer close(writeDone)
+			for frame := range c.writeChan {
+				c.conn.WriteInterleavedFrame(frame)
+			}
+		}()
+
+		buf := make([]byte, 2048)
+		for {
+			_, err := c.conn.NetConn().Read(buf)
+			if err != nil {
+				if err != io.EOF {
+					c.log("ERR: %s", err)
+				}
+				break
+			}
+		}
+
+		done := make(chan struct{})
+		c.p.events <- programEventClientClose{done, c}
+		<-done
+
+		close(c.writeChan)
+		<-writeDone
+
+	} else {
+		for {
+			req, err := c.conn.ReadRequest()
+			if err != nil {
+				if err != io.EOF {
+					c.log("ERR: %s", err)
+				}
+				break
+			}
+
+			err = c.handleRequest(req)
+			if err != nil {
+				break
+			}
+		}
+
+		done := make(chan struct{})
+		c.p.events <- programEventClientClose{done, c}
+		<-done
+	}
+
+	return false
+}
+
+func (c *serverClient) runRecord() bool {
+	if c.streamProtocol == _STREAM_PROTOCOL_TCP {
+		frame := &gortsplib.InterleavedFrame{}
+
+	outer:
+		for {
+			frame.Content = c.readBuf.swap()
+			frame.Content = frame.Content[:cap(frame.Content)]
+			recv, err := c.conn.ReadInterleavedFrameOrRequest(frame)
+			if err != nil {
+				if err != io.EOF {
+					c.log("ERR: %s", err)
+				}
+				break outer
+			}
+
+			switch recvt := recv.(type) {
+			case *gortsplib.InterleavedFrame:
+				trackId, trackFlowType := interleavedChannelToTrackFlowType(frame.Channel)
+
+				if trackId >= len(c.streamTracks) {
+					c.log("ERR: invalid track id '%d'", trackId)
+					break outer
+				}
+
+				c.p.events <- programEventClientFrameTcp{
+					c.path,
+					trackId,
+					trackFlowType,
+					frame.Content,
+				}
+
+			case *gortsplib.Request:
+				err := c.handleRequest(recvt)
+				if err != nil {
+					break outer
+				}
+			}
+		}
+
+		done := make(chan struct{})
+		c.p.events <- programEventClientClose{done, c}
+		<-done
+
+	} else {
+		c.udpLastFrameTime = time.Now()
+
+		udpCheckStreamTicker := time.NewTicker(_UDP_CHECK_STREAM_INTERVAL)
+		udpCheckStreamDone := make(chan struct{})
+		go func() {
+			defer close(udpCheckStreamDone)
+			for range udpCheckStreamTicker.C {
+				if time.Since(c.udpLastFrameTime) >= _UDP_STREAM_DEAD_AFTER {
+					c.log("ERR: stream is dead")
+					c.conn.NetConn().Close()
+					break
+				}
+			}
+		}()
+
+		for {
+			req, err := c.conn.ReadRequest()
+			if err != nil {
+				if err != io.EOF {
+					c.log("ERR: %s", err)
+				}
+				break
+			}
+
+			err = c.handleRequest(req)
+			if err != nil {
+				break
+			}
+		}
+
+		done := make(chan struct{})
+		c.p.events <- programEventClientClose{done, c}
+		<-done
+
+		udpCheckStreamTicker.Stop()
+		<-udpCheckStreamDone
+	}
+
+	return false
+}
+
 func (c *serverClient) close() {
 	c.conn.NetConn().Close()
 	<-c.done
@@ -223,23 +390,12 @@ func (c *serverClient) authenticate(ips []interface{}, user string, pass string,
 		}
 
 		ip := c.ip()
-
-		for _, item := range ips {
-			switch titem := item.(type) {
-			case net.IP:
-				if titem.Equal(ip) {
-					return nil
-				}
-
-			case *net.IPNet:
-				if titem.Contains(ip) {
-					return nil
-				}
-			}
+		if !ipEqualOrInRange(ip, ips) {
+			c.log("ERR: ip '%s' not allowed", ip)
+			return errAuthCritical
 		}
 
-		c.log("ERR: ip '%s' not allowed", ip)
-		return errAuthCritical
+		return nil
 	}()
 	if err != nil {
 		return err
@@ -304,13 +460,13 @@ func (c *serverClient) authenticate(ips []interface{}, user string, pass string,
 	return nil
 }
 
-func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
+func (c *serverClient) handleRequest(req *gortsplib.Request) error {
 	c.log(string(req.Method))
 
 	cseq, ok := req.Header["CSeq"]
 	if !ok || len(cseq) != 1 {
 		c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("cseq missing"))
-		return false
+		return errClientTerminate
 	}
 
 	path := func() string {
@@ -343,34 +499,33 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 					string(gortsplib.ANNOUNCE),
 					string(gortsplib.SETUP),
 					string(gortsplib.PLAY),
-					string(gortsplib.PAUSE),
 					string(gortsplib.RECORD),
 					string(gortsplib.TEARDOWN),
 				}, ", ")},
 			},
 		})
-		return true
+		return nil
 
 	case gortsplib.DESCRIBE:
 		if c.state != _CLIENT_STATE_STARTING {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("client is in state '%s' instead of '%s'", c.state, _CLIENT_STATE_STARTING))
-			return false
+			return errClientTerminate
 		}
 
 		pconf := c.findConfForPath(path)
 		if pconf == nil {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("unable to find a valid configuration for path '%s'", path))
-			return false
+			return errClientTerminate
 		}
 
 		err := c.authenticate(pconf.readIpsParsed, pconf.ReadUser, pconf.ReadPass, req)
 		if err != nil {
 			if err == errAuthCritical {
-				return false
+				return errClientTerminate
 			}
-			return true
+			return nil
 		}
 
 		res := make(chan []byte)
@@ -378,7 +533,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 		sdp := <-res
 		if sdp == nil {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("no one is streaming on path '%s'", path))
-			return false
+			return errClientTerminate
 		}
 
 		c.conn.WriteResponse(&gortsplib.Response{
@@ -390,51 +545,51 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			},
 			Content: sdp,
 		})
-		return true
+		return nil
 
 	case gortsplib.ANNOUNCE:
 		if c.state != _CLIENT_STATE_STARTING {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("client is in state '%s' instead of '%s'", c.state, _CLIENT_STATE_STARTING))
-			return false
+			return errClientTerminate
 		}
 
 		pconf := c.findConfForPath(path)
 		if pconf == nil {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("unable to find a valid configuration for path '%s'", path))
-			return false
+			return errClientTerminate
 		}
 
 		err := c.authenticate(pconf.publishIpsParsed, pconf.PublishUser, pconf.PublishPass, req)
 		if err != nil {
 			if err == errAuthCritical {
-				return false
+				return errClientTerminate
 			}
-			return true
+			return nil
 		}
 
 		ct, ok := req.Header["Content-Type"]
 		if !ok || len(ct) != 1 {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("Content-Type header missing"))
-			return false
+			return errClientTerminate
 		}
 
 		if ct[0] != "application/sdp" {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("unsupported Content-Type '%s'", ct))
-			return false
+			return errClientTerminate
 		}
 
 		sdpParsed, err := gortsplib.SDPParse(req.Content)
 		if err != nil {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("invalid SDP: %s", err))
-			return false
+			return errClientTerminate
 		}
 		sdpParsed, req.Content = gortsplib.SDPFilter(sdpParsed, req.Content)
 
 		if len(path) == 0 {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path can't be empty"))
-			return false
+			return errClientTerminate
 		}
 
 		res := make(chan error)
@@ -442,7 +597,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 		err = <-res
 		if err != nil {
 			c.writeResError(req, gortsplib.StatusBadRequest, err)
-			return false
+			return errClientTerminate
 		}
 
 		c.streamSdpText = req.Content
@@ -454,19 +609,19 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 				"CSeq": cseq,
 			},
 		})
-		return true
+		return nil
 
 	case gortsplib.SETUP:
 		tsRaw, ok := req.Header["Transport"]
 		if !ok || len(tsRaw) != 1 {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header missing"))
-			return false
+			return errClientTerminate
 		}
 
 		th := gortsplib.ReadHeaderTransport(tsRaw[0])
 		if _, ok := th["multicast"]; ok {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("multicast is not supported"))
-			return false
+			return errClientTerminate
 		}
 
 		switch c.state {
@@ -476,15 +631,15 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			if pconf == nil {
 				c.writeResError(req, gortsplib.StatusBadRequest,
 					fmt.Errorf("unable to find a valid configuration for path '%s'", path))
-				return false
+				return errClientTerminate
 			}
 
 			err := c.authenticate(pconf.readIpsParsed, pconf.ReadUser, pconf.ReadPass, req)
 			if err != nil {
 				if err == errAuthCritical {
-					return false
+					return errClientTerminate
 				}
-				return true
+				return nil
 			}
 
 			// play via UDP
@@ -501,23 +656,23 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			}() {
 				if _, ok := c.p.protocols[_STREAM_PROTOCOL_UDP]; !ok {
 					c.writeResError(req, gortsplib.StatusUnsupportedTransport, fmt.Errorf("UDP streaming is disabled"))
-					return false
+					return errClientTerminate
 				}
 
 				rtpPort, rtcpPort := th.GetPorts("client_port")
 				if rtpPort == 0 || rtcpPort == 0 {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not have valid client ports (%s)", tsRaw[0]))
-					return false
+					return errClientTerminate
 				}
 
 				if c.path != "" && path != c.path {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) > 0 && c.streamProtocol != _STREAM_PROTOCOL_UDP {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("can't receive tracks with different protocols"))
-					return false
+					return errClientTerminate
 				}
 
 				res := make(chan error)
@@ -525,7 +680,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 				err = <-res
 				if err != nil {
 					c.writeResError(req, gortsplib.StatusBadRequest, err)
-					return false
+					return errClientTerminate
 				}
 
 				c.conn.WriteResponse(&gortsplib.Response{
@@ -541,23 +696,23 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 						"Session": []string{"12345678"},
 					},
 				})
-				return true
+				return nil
 
 				// play via TCP
 			} else if _, ok := th["RTP/AVP/TCP"]; ok {
 				if _, ok := c.p.protocols[_STREAM_PROTOCOL_TCP]; !ok {
 					c.writeResError(req, gortsplib.StatusUnsupportedTransport, fmt.Errorf("TCP streaming is disabled"))
-					return false
+					return errClientTerminate
 				}
 
 				if c.path != "" && path != c.path {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) > 0 && c.streamProtocol != _STREAM_PROTOCOL_TCP {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("can't receive tracks with different protocols"))
-					return false
+					return errClientTerminate
 				}
 
 				res := make(chan error)
@@ -565,7 +720,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 				err = <-res
 				if err != nil {
 					c.writeResError(req, gortsplib.StatusBadRequest, err)
-					return false
+					return errClientTerminate
 				}
 
 				interleaved := fmt.Sprintf("%d-%d", ((len(c.streamTracks) - 1) * 2), ((len(c.streamTracks)-1)*2)+1)
@@ -582,24 +737,24 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 						"Session": []string{"12345678"},
 					},
 				})
-				return true
+				return nil
 
 			} else {
 				c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not contain a valid protocol (RTP/AVP, RTP/AVP/UDP or RTP/AVP/TCP) (%s)", tsRaw[0]))
-				return false
+				return errClientTerminate
 			}
 
 		// record
 		case _CLIENT_STATE_ANNOUNCE, _CLIENT_STATE_PRE_RECORD:
 			if _, ok := th["mode=record"]; !ok {
 				c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not contain mode=record"))
-				return false
+				return errClientTerminate
 			}
 
 			// after ANNOUNCE, c.path is already set
 			if path != c.path {
 				c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-				return false
+				return errClientTerminate
 			}
 
 			// record via UDP
@@ -616,23 +771,23 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			}() {
 				if _, ok := c.p.protocols[_STREAM_PROTOCOL_UDP]; !ok {
 					c.writeResError(req, gortsplib.StatusUnsupportedTransport, fmt.Errorf("UDP streaming is disabled"))
-					return false
+					return errClientTerminate
 				}
 
 				rtpPort, rtcpPort := th.GetPorts("client_port")
 				if rtpPort == 0 || rtcpPort == 0 {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not have valid client ports (%s)", tsRaw[0]))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) > 0 && c.streamProtocol != _STREAM_PROTOCOL_UDP {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("can't publish tracks with different protocols"))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) >= len(c.streamSdpParsed.Medias) {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("all the tracks have already been setup"))
-					return false
+					return errClientTerminate
 				}
 
 				res := make(chan error)
@@ -640,7 +795,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 				err := <-res
 				if err != nil {
 					c.writeResError(req, gortsplib.StatusBadRequest, err)
-					return false
+					return errClientTerminate
 				}
 
 				c.conn.WriteResponse(&gortsplib.Response{
@@ -656,35 +811,35 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 						"Session": []string{"12345678"},
 					},
 				})
-				return true
+				return nil
 
 				// record via TCP
 			} else if _, ok := th["RTP/AVP/TCP"]; ok {
 				if _, ok := c.p.protocols[_STREAM_PROTOCOL_TCP]; !ok {
 					c.writeResError(req, gortsplib.StatusUnsupportedTransport, fmt.Errorf("TCP streaming is disabled"))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) > 0 && c.streamProtocol != _STREAM_PROTOCOL_TCP {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("can't publish tracks with different protocols"))
-					return false
+					return errClientTerminate
 				}
 
 				interleaved := th.GetValue("interleaved")
 				if interleaved == "" {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not contain the interleaved field"))
-					return false
+					return errClientTerminate
 				}
 
 				expInterleaved := fmt.Sprintf("%d-%d", 0+len(c.streamTracks)*2, 1+len(c.streamTracks)*2)
 				if interleaved != expInterleaved {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("wrong interleaved value, expected '%s', got '%s'", expInterleaved, interleaved))
-					return false
+					return errClientTerminate
 				}
 
 				if len(c.streamTracks) >= len(c.streamSdpParsed.Medias) {
 					c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("all the tracks have already been setup"))
-					return false
+					return errClientTerminate
 				}
 
 				res := make(chan error)
@@ -692,7 +847,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 				err := <-res
 				if err != nil {
 					c.writeResError(req, gortsplib.StatusBadRequest, err)
-					return false
+					return errClientTerminate
 				}
 
 				c.conn.WriteResponse(&gortsplib.Response{
@@ -707,28 +862,28 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 						"Session": []string{"12345678"},
 					},
 				})
-				return true
+				return nil
 
 			} else {
 				c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("transport header does not contain a valid protocol (RTP/AVP, RTP/AVP/UDP or RTP/AVP/TCP) (%s)", tsRaw[0]))
-				return false
+				return errClientTerminate
 			}
 
 		default:
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("client is in state '%s'", c.state))
-			return false
+			return errClientTerminate
 		}
 
 	case gortsplib.PLAY:
 		if c.state != _CLIENT_STATE_PRE_PLAY {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("client is in state '%s' instead of '%s'", c.state, _CLIENT_STATE_PRE_PLAY))
-			return false
+			return errClientTerminate
 		}
 
 		if path != c.path {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-			return false
+			return errClientTerminate
 		}
 
 		// check publisher existence
@@ -737,7 +892,7 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 		err := <-res
 		if err != nil {
 			c.writeResError(req, gortsplib.StatusBadRequest, err)
-			return false
+			return errClientTerminate
 		}
 
 		// write response before setting state
@@ -751,6 +906,9 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			},
 		})
 
+		c.writeBuf = newDoubleBuffer(2048)
+		c.writeChan = make(chan *gortsplib.InterleavedFrame)
+
 		// set state
 		res = make(chan error)
 		c.p.events <- programEventClientPlay2{res, c}
@@ -763,72 +921,23 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			return "tracks"
 		}(), c.streamProtocol)
 
-		// when protocol is TCP, the RTSP connection becomes a RTP connection
-		if c.streamProtocol == _STREAM_PROTOCOL_TCP {
-			// write RTP frames sequentially
-			go func() {
-				for frame := range c.writeChan {
-					c.conn.WriteInterleavedFrame(frame)
-				}
-			}()
-
-			// receive RTP feedback, do not parse it, wait until connection closes
-			buf := make([]byte, 2048)
-			for {
-				_, err := c.conn.NetConn().Read(buf)
-				if err != nil {
-					if err != io.EOF {
-						c.log("ERR: %s", err)
-					}
-					return false
-				}
-			}
-		}
-
-		return true
-
-	case gortsplib.PAUSE:
-		if c.state != _CLIENT_STATE_PLAY {
-			c.writeResError(req, gortsplib.StatusBadRequest,
-				fmt.Errorf("client is in state '%s' instead of '%s'", c.state, _CLIENT_STATE_PLAY))
-			return false
-		}
-
-		if path != c.path {
-			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-			return false
-		}
-
-		c.log("paused")
-
-		res := make(chan error)
-		c.p.events <- programEventClientPause{res, c}
-		<-res
-
-		c.conn.WriteResponse(&gortsplib.Response{
-			StatusCode: gortsplib.StatusOK,
-			Header: gortsplib.Header{
-				"CSeq":    cseq,
-				"Session": []string{"12345678"},
-			},
-		})
-		return true
+		return errClientChangeRunMode
 
 	case gortsplib.RECORD:
 		if c.state != _CLIENT_STATE_PRE_RECORD {
 			c.writeResError(req, gortsplib.StatusBadRequest,
 				fmt.Errorf("client is in state '%s' instead of '%s'", c.state, _CLIENT_STATE_PRE_RECORD))
-			return false
+			return errClientTerminate
 		}
 
 		if path != c.path {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("path has changed"))
-			return false
+			return errClientTerminate
 		}
 
 		if len(c.streamTracks) != len(c.streamSdpParsed.Medias) {
 			c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("not all tracks have been setup"))
-			return false
+			return errClientTerminate
 		}
 
 		c.conn.WriteResponse(&gortsplib.Response{
@@ -850,79 +959,14 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			return "tracks"
 		}(), c.streamProtocol)
 
-		// when protocol is TCP, the RTSP connection becomes a RTP connection
-		// receive RTP data and parse it
-		if c.streamProtocol == _STREAM_PROTOCOL_TCP {
-			frame := &gortsplib.InterleavedFrame{}
-			for {
-				frame.Content = c.readBuf.swap()
-				frame.Content = frame.Content[:cap(frame.Content)]
-				recv, err := c.conn.ReadInterleavedFrameOrRequest(frame)
-				if err != nil {
-					if err != io.EOF {
-						c.log("ERR: %s", err)
-					}
-					return false
-				}
-
-				switch recvt := recv.(type) {
-				case *gortsplib.InterleavedFrame:
-					trackId, trackFlowType := interleavedChannelToTrackFlowType(frame.Channel)
-
-					if trackId >= len(c.streamTracks) {
-						c.log("ERR: invalid track id '%d'", trackId)
-						return false
-					}
-
-					c.p.events <- programEventClientFrameTcp{
-						c.path,
-						trackId,
-						trackFlowType,
-						frame.Content,
-					}
-
-				case *gortsplib.Request:
-					cseq, ok := recvt.Header["CSeq"]
-					if !ok || len(cseq) != 1 {
-						c.writeResError(recvt, gortsplib.StatusBadRequest, fmt.Errorf("cseq missing"))
-						return false
-					}
-
-					switch recvt.Method {
-					case gortsplib.TEARDOWN:
-						// close connection silently
-						return false
-
-					default:
-						c.writeResError(recvt, gortsplib.StatusBadRequest, fmt.Errorf("unhandled method '%s'", recvt.Method))
-						return false
-					}
-				}
-
-			}
-		} else {
-			c.udpLastFrameTime = time.Now()
-			c.udpCheckStreamTicker = time.NewTicker(_UDP_CHECK_STREAM_INTERVAL)
-
-			go func() {
-				for range c.udpCheckStreamTicker.C {
-					if time.Since(c.udpLastFrameTime) >= _UDP_STREAM_DEAD_AFTER {
-						c.log("ERR: stream is dead")
-						c.conn.NetConn().Close()
-						break
-					}
-				}
-			}()
-		}
-
-		return true
+		return errClientChangeRunMode
 
 	case gortsplib.TEARDOWN:
 		// close connection silently
-		return false
+		return errClientTerminate
 
 	default:
 		c.writeResError(req, gortsplib.StatusBadRequest, fmt.Errorf("unhandled method '%s'", req.Method))
-		return false
+		return errClientTerminate
 	}
 }
diff --git a/server-udpl.go b/server-udpl.go
index 44de8059..8aaab5bb 100644
--- a/server-udpl.go
+++ b/server-udpl.go
@@ -5,7 +5,7 @@ import (
 	"time"
 )
 
-type udpAddrFramePair struct {
+type udpAddrBufPair struct {
 	addr *net.UDPAddr
 	buf  []byte
 }
@@ -17,7 +17,7 @@ type serverUdpListener struct {
 	readBuf       *doubleBuffer
 	writeBuf      *doubleBuffer
 
-	writeChan chan *udpAddrFramePair
+	writeChan chan *udpAddrBufPair
 	done      chan struct{}
 }
 
@@ -35,7 +35,7 @@ func newServerUdpListener(p *program, port int, trackFlowType trackFlowType) (*s
 		trackFlowType: trackFlowType,
 		readBuf:       newDoubleBuffer(2048),
 		writeBuf:      newDoubleBuffer(2048),
-		writeChan:     make(chan *udpAddrFramePair),
+		writeChan:     make(chan *udpAddrBufPair),
 		done:          make(chan struct{}),
 	}
 
@@ -69,8 +69,8 @@ func (l *serverUdpListener) run() {
 		}
 
 		l.p.events <- programEventClientFrameUdp{
-			l.trackFlowType,
 			addr,
+			l.trackFlowType,
 			buf[:n],
 		}
 	}
@@ -85,13 +85,12 @@ func (l *serverUdpListener) close() {
 	<-l.done
 }
 
-func (l *serverUdpListener) write(addr *net.UDPAddr, inbuf []byte) {
+func (l *serverUdpListener) write(pair *udpAddrBufPair) {
+	// replace input buffer with write buffer
 	buf := l.writeBuf.swap()
-	buf = buf[:len(inbuf)]
-	copy(buf, inbuf)
+	buf = buf[:len(pair.buf)]
+	copy(buf, pair.buf)
+	pair.buf = buf
 
-	l.writeChan <- &udpAddrFramePair{
-		addr: addr,
-		buf:  buf,
-	}
+	l.writeChan <- pair
 }
diff --git a/streamer-udpl.go b/streamer-udpl.go
index 1c2b1e58..9f102602 100644
--- a/streamer-udpl.go
+++ b/streamer-udpl.go
@@ -15,7 +15,6 @@ type streamerUdpListener struct {
 	nconn         *net.UDPConn
 	running       bool
 	readBuf       *doubleBuffer
-	lastFrameTime time.Time
 
 	done chan struct{}
 }
@@ -37,7 +36,6 @@ func newStreamerUdpListener(p *program, port int, streamer *streamer,
 		publisherIp:   publisherIp,
 		nconn:         nconn,
 		readBuf:       newDoubleBuffer(2048),
-		lastFrameTime: time.Now(),
 		done:          make(chan struct{}),
 	}
 
@@ -69,7 +67,7 @@ func (l *streamerUdpListener) run() {
 			continue
 		}
 
-		l.lastFrameTime = time.Now()
+		l.streamer.udpLastFrameTime = time.Now()
 
 		l.p.events <- programEventStreamerFrame{l.streamer, l.trackId, l.trackFlowType, buf[:n]}
 	}
diff --git a/streamer.go b/streamer.go
index 4cf99925..c25c7174 100644
--- a/streamer.go
+++ b/streamer.go
@@ -27,16 +27,17 @@ type streamerUdpListenerPair struct {
 }
 
 type streamer struct {
-	p               *program
-	path            string
-	ur              *url.URL
-	proto           streamProtocol
-	ready           bool
-	clientSdpParsed *sdp.Message
-	serverSdpText   []byte
-	serverSdpParsed *sdp.Message
-	firstTime       bool
-	readBuf         *doubleBuffer
+	p                *program
+	path             string
+	ur               *url.URL
+	proto            streamProtocol
+	ready            bool
+	clientSdpParsed  *sdp.Message
+	serverSdpText    []byte
+	serverSdpParsed  *sdp.Message
+	firstTime        bool
+	udpLastFrameTime time.Time
+	readBuf          *doubleBuffer
 
 	terminate chan struct{}
 	done      chan struct{}
@@ -402,6 +403,7 @@ func (s *streamer) runUdp(conn *gortsplib.ConnClient) bool {
 	tickerSendKeepalive := time.NewTicker(_KEEPALIVE_INTERVAL)
 	defer tickerSendKeepalive.Stop()
 
+	s.udpLastFrameTime = time.Now()
 	tickerCheckStream := time.NewTicker(_CHECK_STREAM_INTERVAL)
 	defer tickerCheckStream.Stop()
 
@@ -431,21 +433,7 @@ func (s *streamer) runUdp(conn *gortsplib.ConnClient) bool {
 			}
 
 		case <-tickerCheckStream.C:
-			lastFrameTime := time.Time{}
-
-			for _, pair := range streamerUdpListenerPairs {
-				lft := pair.udplRtp.lastFrameTime
-				if lft.After(lastFrameTime) {
-					lastFrameTime = lft
-				}
-
-				lft = pair.udplRtcp.lastFrameTime
-				if lft.After(lastFrameTime) {
-					lastFrameTime = lft
-				}
-			}
-
-			if time.Since(lastFrameTime) >= _STREAM_DEAD_AFTER {
+			if time.Since(s.udpLastFrameTime) >= _STREAM_DEAD_AFTER {
 				s.log("ERR: stream is dead")
 				return true
 			}
diff --git a/utils.go b/utils.go
index 422d1e95..9942dc4c 100644
--- a/utils.go
+++ b/utils.go
@@ -29,6 +29,23 @@ func parseIpCidrList(in []string) ([]interface{}, error) {
 	return ret, nil
 }
 
+func ipEqualOrInRange(ip net.IP, ips []interface{}) bool {
+	for _, item := range ips {
+		switch titem := item.(type) {
+		case net.IP:
+			if titem.Equal(ip) {
+				return true
+			}
+
+		case *net.IPNet:
+			if titem.Contains(ip) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
 type trackFlowType int
 
 const (