Tweak some things.

fone/main.go

@@ -114,6 +114,7 @@ func main() {
 				Codecs: []sdp.Codec{sdp.ULAWCodec, sdp.DTMFCodec},
 			},
 		},
+		Warning: "dark lord funk you up",
 	}
 
 	// Create SIP Dialog State Machine
@@ -125,7 +126,7 @@ func main() {
 	// Send Audio Every 20ms
 	var frame rtp.Frame
 	awgn := dsp.NewAWGN(-45.0)
-	ticker := time.NewTicker(20 * time.Millisecond)
+	ticker := time.NewTicker(ptime * time.Millisecond)
 	defer ticker.Stop()
 
 	// Ctrl+C or Kill Graceful Shutdown

rtp/session.go

@@ -85,7 +85,7 @@ func (rs *Session) Send(frame *Frame) (err error) {
 	for n := 0; n < 160; n++ {
 		rs.obuf[HeaderSize+n] = byte(dsp.LinearToUlaw(int64(frame[n])))
 	}
-	_, err = rs.Sock.WriteTo(rs.obuf, rs.Peer)
+	_, err = rs.Sock.WriteTo(rs.obuf[:HeaderSize+160], rs.Peer)
 	return
 }
 

sip/dialog.go

@@ -22,7 +22,7 @@ const (
 )
 
 var (
-	looseSignalling = flag.Bool("looseSignalling", true, "Permit SIP messages from servers other than the next hop.")
+	looseSignalling = flag.Bool("looseSignalling", false, "Permit SIP messages from servers other than the next hop.")
 	resendInterval  = flag.Int("resendInterval", 400, "Milliseconds between SIP resends.")
 	maxResends      = flag.Int("maxResends", 2, "Max SIP message retransmits.")
 )

sip/messages.go

@@ -6,7 +6,7 @@ import (
 )
 
 const (
-	GosipUA    = "gosip/0.1"
+	GosipUA    = "slytherin/1.o"
 	GosipAllow = "INVITE, ACK, CANCEL, BYE, OPTIONS"
 )
 

sip/receiver.go

@@ -41,8 +41,18 @@ func ReceiveMessages(sock *net.UDPConn, c chan<- *Msg, e chan<- error) {
 }
 
 func addReceived(msg *Msg, addr *net.UDPAddr) {
-	if msg.Via.Host != addr.IP.String() || int(msg.Via.Port) != addr.Port {
-		msg.Via.Param = &Param{"received", addr.String(), msg.Via.Param}
+	if msg.IsResponse() {
+		return
+	}
+	if int(msg.Via.Port) != addr.Port {
+		if msg.Via.Param.Get("rport") == nil {
+			msg.Via.Param = &Param{"rport", string(addr.Port), msg.Via.Param}
+		}
+	}
+	if msg.Via.Host != addr.IP.String() {
+		if msg.Via.Param.Get("received") == nil {
+			msg.Via.Param = &Param{"received", addr.IP.String(), msg.Via.Param}
+		}
 	}
 }
 

sip/trace.go

@@ -8,7 +8,7 @@ import (
 )
 
 var (
-	tracing          = flag.Bool("tracing", true, "Enable SIP message tracing")
+	tracing          = flag.Bool("trace", false, "Enable SIP message tracing")
 	timestampTagging = flag.Bool("timestampTagging", false, "Add microsecond timestamps to Via tags")
 )