使用SIP魔术师C＃进行响应

为了回答您在评论中发布的第二个问题，即第二个SUBSCRIBE请求为何在对话中（或更正确地说是在交易中）；它不是。

但是，由于您正在重新使用从响应到第一个SUBSCRIBE请求的响应中获得的SIP标头，因此最终会以某种方式设置某些标头，使其看起来像是现有事务的一部分。

正确的方法是重新使用原始SIP请求中的标头，并递增CSeq并重新生成CallID。下面的代码类似（请注意，我没有编译它来检查语法错误）。

    static SIPTransport Transport;
    static SIPMessage msg;
    static string inputMsg;
    static SIPUDPChannel channel;
    static SIPRequest subscribeRequest;

    static void Main(string[] args)
    {
        InitializeSIP();
        Console.Read();
    }

    static void InitializeSIP()
    {
        //ResolveIPEndPoint
        SIPEndPoint sipep = new SIPEndPoint(new IPEndPoint(IPAddress.Parse("192.168.102.12"), 5060));
        IPEndPoint remoteEP = new IPEndPoint(IPAddress.Parse("192.168.102.12"), 5060);

        //Set Transport
        Transport = new SIPTransport(SIPDNSManager.ResolveSIPService, new SIPTransactionEngine());

        //IPEndPoint
        IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("192.168.100.10"), 8080);

        //Create Channel object
        channel = new SIPUDPChannel(localEndPoint);
        Transport.AddSIPChannel(channel);

        //Wire transport with incoming requests
        Transport.SIPTransportRequestReceived += new SIPTransportRequestDelegate(Transport_SIPTransportRequestReceived);

        //Wire transport with incoming responses
        Transport.SIPTransportResponseReceived += new SIPTransportResponseDelegate(Transport_SIPTransportResponseReceived);

        inputMsg = "SUBSCRIBE sip:[email protected] SIP/2.0" + SIPConstants.CRLF +
        "Via: SIP/2.0/UDP 192.168.100.10:8080;rport;branch=z9hG4bKFBB7EAC06934405182D13950BD51F001" + SIPConstants.CRLF +
        "From: <sip:[email protected]>;tag=196468136" + SIPConstants.CRLF +
        "To: <sip:[email protected]>" + SIPConstants.CRLF +
        "Contact: <sip:subscribeUser@>" + SIPConstants.CRLF +
        "Call-ID: 1337505490-453410046-705466123" + SIPConstants.CRLF +
        "CSeq: 1 SUBSCRIBE" + SIPConstants.CRLF +
        "Max-Forwards: 70" + SIPConstants.CRLF +
        "Event: Presence" + SIPConstants.CRLF +
        "Content-Length: 0";

        subscribeRequest = SIPRequest.ParseSIPRequest(inputMsg);

        channel.Send(remoteEP, subscribeRequest.ToString());
    }

    static void Transport_SIPTransportResponseReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPResponse sipResponse)
    {
        Console.WriteLine("Response method: " + sipResponse.Header.CSeqMethod);
        if(sipResponse.StatusCode == 401 && sipResponse.Header.CSeqMethod == SIPMethodsEnum.SUBSCRIBE)
        {
                            //Resubscribe with Digist
            //SIP Header
            SIPHeader header = subscribeRequest.Header;
            header.CSeq++;
            header.CallID = "some_new_callID";
            header.AuthenticationHeader = sipResponse.Header.AuthenticationHeader;
            header.Expires = 120;

            //New Request
            SIPRequest request = new SIPRequest(SIPMethodsEnum.SUBSCRIBE, new SIPURI(SIPSchemesEnum.sip, remoteEndPoint));
            request.LocalSIPEndPoint = localSIPEndPoint;
            request.RemoteSIPEndPoint = remoteEndPoint;
            request.Header = header;

            //Send request
            channel.Send(remoteEndPoint.GetIPEndPoint(), request.ToString());
        }
        else
            Console.WriteLine(string.Format("Error {0} {1}.", sipResponse.StatusCode, sipResponse.Status));
    }

    static void Transport_SIPTransportRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
    {
        Console.WriteLine("Request body: " + sipRequest.Body);
    }

更新：

您将凭据添加到SIP请求中，如下面的代码所示。注意，认证头基于每个请求而不是每个传输或每个信道。在sipsorcery代码中，SIPTransport可以具有多个SIPChannel，而SIPChannel可以与多个SIP端点进行通信，因此在传输或通道上设置凭据没有意义。

SIPAuthorisationDigest authDigest = sipResponse.Header.AuthenticationHeader.SIPDigest;
authDigest.SetCredentials(username, password, uri, SIPMethodsEnum.INVITE.ToString());
authRequest.Header.AuthenticationHeader = new SIPAuthenticationHeader(authDigest);
authRequest.Header.AuthenticationHeader.SIPDigest.Response = authDigest.Digest;

更新2：

发送对SIP请求的简单响应的最简单方法如下。

static void Transport_SIPTransportRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
    SIPResponse response = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.Ok, null);
    _sipTransport.SendResponse(response);
}