private void Handle100Trying(SipMessage last, SipMessage current)
{
if (current == null)
{
// TODO: no message received
return;
}
this.WaitForMessage(current, this.Handle183, 10, 50, 100, 1000, 2000, 5000);
}
private void Handle183(SipMessage last, SipMessage current)
{
if (current.Method == "180")
{
this.WaitForMessage(current, this.Handle183, 100, 500, 1000);
return;
}
if (current.SdpData != null)
{
this.SetSdpInformation(current.SdpData);
}
this.stateChanged(this, DialogState.PreAck);
var resp = current as SipResponse;
if (resp == null)
{
Console.WriteLine("sip response is null. expected a 183 response");
return;
}
Console.WriteLine(resp.StatusCode);
if (resp.StatusCode == 183)
{
var ack = new AckMessage(current.CallId, last.From, current.To, 70, null, current.Via);
ack.Headers["Allow"] = "INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,INFO,SUBSCRIBE,NOTIFY,REFER,UPDATE";
ack.Contact = last.Contact;
ack.Headers["CSeq"] = this.callSequence + " ACK";
ack.Headers["From"] = last.Headers["From"];
ack.Headers["Session-ID"] = current.Headers["Session-ID"];
ack.Headers["Content-Length"] = "0";
this.Send(ack);
this.stateChanged(this, DialogState.Answered);
SipMessage response;
if (this.TryGetNextMessage(60000, out response))
{
this.Handle200Ack(ack, response);
}
}
}
private void HandleInviteResponse(SipMessage request, SipMessage response)
{
if (response != null)
{
switch (response.Method.ToLowerInvariant())
{
case "100":
this.WaitForMessage(response, this.Handle183, 100, 500, 1000, 2000, 5000);
break;
default:
throw new InvalidOperationException("Cant handle this message: " + response.Method);
}
}
}
public bool TryReceive(CancellationTokenSource tks, out SipMessage msg)
{
msg = null;
var resp = this.client.ReceiveAsync();
UdpReceiveResult result;
if (resp.IsCanceled)
{
Console.WriteLine("resp is cancelled");
// generate 408 timeout
return(false);
}
try
{
result = resp.Result;
resp.Wait(tks.Token);
}
catch (OperationCanceledException)
{
Console.WriteLine("operation cancelled");
return(false);
}
catch (Exception ex)
{
Console.WriteLine(ex);
return(false);
}
// TODO: copy custom headers as record route
var data = result.Buffer;
msg = SipMessage.Parse(data);
if (msg != null)
{
Console.WriteLine("message received: {0}", msg.Method);
}
return(true);
}
private void WaitForMessage(SipMessage currentMessage, MessageReceivedEventHandler handler, int timer, params int[] timers)
{
Task.Factory.StartNew(
() =>
{
foreach (var i in new[] { timer }.Concat(timers))
{
SipMessage msg;
if (this.TryGetNextMessage(i, out msg))
{
if (msg.CallId == this.CallId)
{
handler(currentMessage, msg);
return;
}
}
}
handler(currentMessage, null);
});
}
private bool TryGetNextMessage(int timeout, out SipMessage msg)
{
return(this.TryGetNextMessage(new CancellationTokenSource(timeout).Token, out msg));
}
private void Send(SipMessage msg)
{
var dgram = msg.Serialize();
this.connection.Send(dgram, dgram.Length, this.remoteHost);
}
public void Send(SipMessage msg)
{
var dgram = msg.Serialize();
this.client.Send(dgram, dgram.Length, this.remoteHost);
}
private void Handle200Ack(SipMessage request, SipMessage response)
{
if (response.Method == "200")
{
this.stateChanged(this, DialogState.Answered);
var ack = new AckMessage(request.CallId, request.From, request.To, 70, request.Supported, request.Via);
ack.Headers["CSeq"] = request.Headers["CSeq"].ToString().Split(' ')[0] + " ACK";
this.Send(ack);
}
while (!this.TryGetNextMessage(100, out response))
{
Console.WriteLine("waiting for bye");
if (this.byeRequest.IsCancellationRequested)
{
response = null;
break;
}
}
if (response == null)
{
Console.WriteLine("but message was null");
this.stateChanged(this, DialogState.Hanging);
var bye = new SipMessage(request.To, "BYE")
{
CallId = request.CallId,
From = request.From,
MaxForwards = 70,
Contact = request.Contact,
Via = request.Via
};
bye.Headers["Allow"] = "INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,INFO,SUBSCRIBE,NOTIFY,REFER,UPDATE";
bye.Headers["CSeq"] = Interlocked.Increment(ref this.callSequence) + " BYE";
bye.Headers["Session-ID"] = request.Headers["Session-ID"];
bye.Headers["Content-Length"] = "0";
this.Send(bye);
this.stateChanged(this, DialogState.Hungup);
// TODO: check this response is a 200 OK
//this.TryGetNextMessage(this.byeRequest.Token, out response);
this.byeRequest.Cancel();
}
else
{
this.stateChanged(this, DialogState.Hanging);
// this is a bye request
var msg = new OkResponse(response.To)
{
CallId = response.CallId,
From = response.From,
MaxForwards = 70,
Via = response.Via
};
msg.Headers["Allow"] = "INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,INFO,SUBSCRIBE,NOTIFY,REFER,UPDATE";
msg.Contact = request.Contact;
// TODO: maybe this sequence is not correct
msg.Headers["CSeq"] = response.Headers["CSeq"];
msg.Headers["Session-ID"] = response.Headers["Session-ID"];
msg.Headers["Content-Length"] = "0";
this.Send(msg);
this.stateChanged(this, DialogState.Hungup);
this.byeRequest.Cancel();
}
}
