/// <summary>
/// Notifies the associated SIP application that a dialog has been created.
/// </summary>
/// <param name="dialog">The dialog.</param>
/// <param name="ua">The ua.</param>
public void DialogCreated(Dialog dialog, UserAgent ua)
{
App.DialogCreated(dialog, ua, this);
}
/// <summary>
/// Handles the received response and passes it to the appropriate transaction or dialog for further handling.
/// </summary>
/// <param name="r">The received response.</param>
/// <param name="uri">The SIP URI.</param>
private void ReceivedResponse(Message r, SIPURI uri)
{
if (r.Headers.ContainsKey("Service-Route") && r.Is2XX() && r.First("CSeq").Method.Contains("REGISTER"))
{
ServiceRoute = r.Headers["Service-Route"];
foreach (Header h in ServiceRoute)
{
h.Name = "Route";
}
}
else if (r.Headers.ContainsKey("Record-Route") && r.Is2XX())
{
// TODO: FIX This ? don't need to keep building record-route ?
//InviteRecordRoute = r.Headers["Record-Route"];
//foreach (Header h in InviteRecordRoute)
//{
// h.Name = "Route";
//}
}
if (!r.Headers.ContainsKey("Via"))
{
Debug.Assert(false, String.Format("No Via header in received response \n{0}\n", r));
return;
}
string branch = r.Headers["Via"][0].Attributes["branch"];
string method = r.Headers["CSeq"][0].Method;
Transaction t = FindTransaction(Transaction.CreateId(branch, method));
if (t == null)
{
if ((method == "INVITE") && (r.Is2XX()))
{
_log.Debug("Looking for dialog with ID " + Dialog.ExtractID(r));
foreach (KeyValuePair <string, Dialog> keyValuePair in Dialogs)
{
_log.Debug("Current Dialogs " + keyValuePair.Key);
}
Dialog d = FindDialog(r);
if (d == null)
{
Debug.Assert(false, String.Format("No transaction or dialog for 2xx of INVITE \n{0}\n", r));
return;
}
else
{
d.ReceivedResponse(null, r);
}
}
else
{
Console.WriteLine("No Transaction for response...ignoring....");
//Debug.Assert(false, String.Format("No Transaction for response \n{0}\n", r.ToString()));
return;
}
}
else
{
t.ReceivedResponse(r);
return;
}
}
/// <summary>
/// Handle received request
/// </summary>
/// <param name="m">The received message.</param>
/// <param name="uri">The SIPURI that sent the message.</param>
private void ReceivedRequest(Message m, SIPURI uri)
{
string branch = m.Headers["Via"][0].Attributes["branch"];
Transaction t;
if (m.Method == "ACK")
{
if (branch == "0")
{
t = null;
}
else
{
t = FindTransaction(branch);
if (t == null || (t.LastResponse != null && t.LastResponse.Is2XX()))
{
t = FindTransaction(Transaction.CreateId(branch, m.Method));
}
}
}
else
{
t = FindTransaction(Transaction.CreateId(branch, m.Method));
}
if (t == null)
{
UserAgent app = null; // Huh ?
if ((m.Method != "CANCEL") && (m.Headers["To"][0].Attributes.ContainsKey("tag")))
{
//In dialog request
Dialog d = FindDialog(m);
if (d == null)
{
if (m.Method != "ACK")
{
//Updated from latest code TODO
UserAgent u = CreateServer(m, uri);
if (u != null)
{
app = u;
}
else
{
// TODO: FIX NOTIFY ON SUBSCRIBE HANDLING
if (m.Method != "NOTIFY")
{
Send(Message.CreateResponse(481, "Dialog does not exist", null, null, m));
return;
}
else
{
string branchID = m.Headers["Via"][0].Attributes["branch"];
if (_seenNotifys.ContainsKey(branchID) && _seenNotifys[branchID] > 1)
{
Send(Message.CreateResponse(481, "Dialog does not exist", null, null, m));
return;
}
else
{
if (_seenNotifys.ContainsKey(branchID))
{
_seenNotifys[branchID] = _seenNotifys[branchID] + 1;
}
else
{
_seenNotifys[branchID] = 1;
}
}
}
return;
}
}
else
{
_log.Info("No dialog for ACK, finding transaction");
if (t == null && branch != "0")
{
t = FindTransaction(Transaction.CreateId(branch, "INVITE"));
}
if (t != null && t.State != "terminated")
{
t.ReceivedRequest(m);
return;
}
else
{
_log.Info("No existing transaction for ACK \n");
UserAgent u = CreateServer(m, uri);
if (u != null)
{
app = u;
}
else
{
return;
}
}
}
}
else
{
app = d;
}
}
else if (m.Method != "CANCEL")
{
//Out of dialog request
UserAgent u = CreateServer(m, uri);
if (u != null)
{
//TODO error.....
app = u;
}
else if (m.Method == "OPTIONS")
{
//Handle OPTIONS
Message reply = Message.CreateResponse(200, "OK", null, null, m);
reply.InsertHeader(new Header("INVITE,ACK,CANCEL,BYE,OPTION,MESSAGE,PUBLISH", "Allow"));
Send(m);
return;
}
else if (m.Method == "MESSAGE")
{
//Handle MESSAGE
UserAgent ua = new UserAgent(this)
{
Request = m
};
/*Message reply = ua.CreateResponse(200, "OK");
* Send(reply);*/
App.ReceivedRequest(ua, m, this);
return;
}
else if (m.Method == "PUBLISH")
{
UserAgent ua = new UserAgent(this)
{
Request = m
};
App.ReceivedRequest(ua, m, this);
return;
}
else if (m.Method != "ACK")
{
Send(Message.CreateResponse(405, "Method not allowed", null, null, m));
return;
}
}
else
{
//Cancel Request
Transaction o =
FindTransaction(Transaction.CreateId(m.Headers["Via"][0].Attributes["branch"], "INVITE"));
if (o == null)
{
Send(Message.CreateResponse(481, "Original transaction does not exist", null, null, m));
return;
}
app = o.App;
}
if (app != null)
{
//t = Transaction.CreateServer(app.Stack, app, app.Request, app.Stack.Transport, app.Stack.Tag);
// TODO: Check app or this ?
t = Transaction.CreateServer(this, app, m, Transport, Tag);
}
else if (m.Method != "ACK")
{
Send(Message.CreateResponse(404, "Not found", null, null, m));
}
}
else
{
t.ReceivedRequest(m);
}
}