/// <summary>
/// Retries the next candidate to send to.
/// </summary>
/// <param name="branch">The branch.</param>
private void RetryNextCandidate(ProxyBranch branch)
{
if ((RemoteCandidates == null) || (RemoteCandidates.Count == 0))
{
Debug.Assert(false, String.Format("No more DNS resolved address to try"));
}
SIPURI target = RemoteCandidates.First();
RemoteCandidates.RemoveAt(0);
branch.Request.First("Via").Attributes["branch"] += "A";
branch.Transaction = Transaction.CreateClient(Stack, this, branch.Request, Stack.Transport,
target.Host + ":" + target.Port);
}
/// <summary>
/// Sends a specific SIP request.
/// </summary>
/// <param name="request">The request.</param>
public virtual void SendRequest(Message request)
{
if ((Request == null) && (request.Method == "REGISTER"))
{
if ((Transaction == null) && (Transaction.State != "completed") && (Transaction.State != "terminated"))
{
//TODO This doesn't make sense....
Debug.Assert(false, String.Format("Cannot re-REGISTER since pending registration\n"));
}
}
Request = request;
if (!request.Headers.ContainsKey("Route"))
{
RemoteTarget = request.Uri;
}
SIPURI target = RemoteTarget;
if (request.Headers.ContainsKey("Route"))
{
if (request.Headers["Route"].Count > 0)
{
target = ((Address)(request.Headers["Route"][0].Value)).Uri;
if ((target == null) || !target.Parameters.ContainsKey("lr"))
{
request.Headers["Route"].RemoveAt(0);
if (request.Headers["Route"].Count > 0)
{
request.Headers["Route"].Insert(request.Headers["Route"].Count - 1,
new Header(request.Uri.ToString(), "Route"));
}
request.Uri = target;
}
}
}
// TODO: remove any Route Header in REGISTER request
Stack.Sending(this, request);
if (target != null)
{
SIPURI dest = target.Dup();
if (dest.Port == 0)
{
dest.Port = 5060;
}
if (Helpers.IsIPv4(dest.Host))
{
RemoteCandidates = new List <SIPURI> {
dest
};
}
}
if ((RemoteCandidates == null) || (RemoteCandidates.Count == 0))
{
Error(null, "Cannot Resolve DNS target");
return;
}
target = RemoteCandidates.First();
RemoteCandidates.RemoveAt(0);
if (Request.Method != "ACK")
{
Transaction = Transaction.CreateClient(Stack, this, Request, Stack.Transport,
target.Host + ":" + target.Port);
}
else
{
Stack.Send(Request, target.Host + ":" + target.Port);
}
}