diff --git a/transport/layer.go b/transport/layer.go
index 1078eda..bcd0d78 100644
--- a/transport/layer.go
+++ b/transport/layer.go
@@ -470,10 +470,10 @@ func (l *Layer) Close() error {
 
 func IsReliable(network string) bool {
 	switch network {
-	case "tcp", "tls", "ws", "wss", "TCP", "TLS", "WS", "WSS":
-		return true
-	default:
+	case "udp", "UDP":
 		return false
+	default:
+		return true
 	}
 }
 
diff --git a/transport/tcp.go b/transport/tcp.go
index 0258cb4..e13adff 100644
--- a/transport/tcp.go
+++ b/transport/tcp.go
@@ -98,7 +98,7 @@ func (t *TCPTransport) createConnection(ctx context.Context, laddr *net.TCPAddr,
 	d := net.Dialer{
 		LocalAddr: laddr,
 	}
-	conn, err := d.DialContext(ctx, "tcp", raddr.String())
+	conn, err := d.DialContext(ctx, "tcp", addr)
 	if err != nil {
 		return nil, fmt.Errorf("%s dial err=%w", t, err)
 	}
diff --git a/transport/udp.go b/transport/udp.go
index f017f9e..6803ca9 100644
--- a/transport/udp.go
+++ b/transport/udp.go
@@ -338,7 +338,8 @@ func (c *UDPConnection) Write(b []byte) (n int, err error) {
 func (c *UDPConnection) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
 	// Some debug hook. TODO move to proper way
 	n, addr, err = c.PacketConn.ReadFrom(b)
-	if SIPDebug {
+	if SIPDebug && err == nil {
+		// addr is nil on error
 		log.Debug().Msgf("UDP read from %s <- %s:\n%s", c.PacketConn.LocalAddr().String(), addr.String(), string(b[:n]))
 	}
 	return n, addr, err
@@ -347,7 +348,8 @@ func (c *UDPConnection) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
 func (c *UDPConnection) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 	// Some debug hook. TODO move to proper way
 	n, err = c.PacketConn.WriteTo(b, addr)
-	if SIPDebug {
+	if SIPDebug && err == nil {
+		// addr is nil on error
 		log.Debug().Msgf("UDP write to %s -> %s:\n%s", c.PacketConn.LocalAddr().String(), addr.String(), string(b[:n]))
 	}
 	return n, err