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public Answer ( string contentType, string body, |
||
| contentType | string | |
| body | string | |
| answeredDialogue | ||
| transferMode | SIPDialogueTransferModesEnum | |
| return | ||
/// <summary>
/// Answers the call request contained in the user agent server parameter. Note the
/// <see cref="AcceptCall(SIPRequest)"/> method should be used to create the user agent server.
/// Any existing call will be hungup.
/// </summary>
/// <param name="uas">The user agent server holding the pending call to answer.</param>
/// <param name="mediaSession">The media session used for this call</param>
/// <param name="customHeaders">Custom SIP-Headers to use in Answer.</param>
public async Task Answer(SIPServerUserAgent uas, IMediaSession mediaSession, string[] customHeaders)
{
// This call is now taking over any existing call.
if (IsCallActive)
{
Hangup();
}
else if (uas.IsCancelled)
{
logger.LogDebug("The incoming call has been cancelled.");
mediaSession?.Close("call cancelled");
}
else
{
m_cts = new CancellationTokenSource();
var sipRequest = uas.ClientTransaction.TransactionRequest;
MediaSession = mediaSession;
MediaSession.OnRtpEvent += OnRemoteRtpEvent;
//MediaSession.OnRtpClosed += (reason) => Hangup();
MediaSession.OnRtpClosed += (reason) =>
{
if (!MediaSession.IsClosed)
{
logger.LogWarning($"RTP channel was closed with reason {reason}.");
}
};
SDP remoteSdp = SDP.ParseSDPDescription(sipRequest.Body);
MediaSession.setRemoteDescription(new RTCSessionDescription {
sdp = remoteSdp, type = RTCSdpType.offer
});;
var sdpAnswer = await MediaSession.createAnswer(null).ConfigureAwait(false);
MediaSession.setLocalDescription(new RTCSessionDescription {
sdp = sdpAnswer, type = RTCSdpType.answer
});
await MediaSession.Start().ConfigureAwait(false);
m_uas = uas;
m_uas.Answer(m_sdpContentType, sdpAnswer.ToString(), null, SIPDialogueTransferModesEnum.Default, customHeaders);
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
}
}
/// <summary>
/// Answers the call request contained in the user agent server parameter. Note the
/// <see cref="AcceptCall(SIPRequest)"/> method should be used to create the user agent server.
/// Any existing call will be hungup.
/// </summary>
/// <param name="uas">The user agent server holding the pending call to answer.</param>
/// <param name="mediaSession">The media session used for this call</param>
public async Task Answer(SIPServerUserAgent uas, IMediaSession mediaSession)
{
// This call is now taking over any existing call.
if (IsCallActive)
{
Hangup();
}
var sipRequest = uas.ClientTransaction.TransactionRequest;
MediaSession = mediaSession;
MediaSession.SessionMediaChanged += MediaSessionOnSessionMediaChanged;
MediaSession.OnRtpClosed += (reason) => Hangup();
var sdpAnswer = await MediaSession.AnswerOffer(sipRequest.Body).ConfigureAwait(false);
m_uas = uas;
m_uas.Answer(m_sdpContentType, sdpAnswer, null, SIPDialogueTransferModesEnum.Default);
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
}
/// <summary>
/// Answers the call request contained in the user agent server parameter. Note the
/// <see cref="AcceptCall(SIPRequest)"/> method should be used to create the user agent server.
/// Any existing call will be hungup.
/// </summary>
/// <param name="uas">The user agent server holding the pending call to answer.</param>
/// <param name="mediaSession">The media session used for this call</param>
/// <param name="customHeaders">Custom SIP-Headers to use in Answer.</param>
public async Task Answer(SIPServerUserAgent uas, IMediaSession mediaSession, string[] customHeaders)
{
// This call is now taking over any existing call.
if (IsCallActive)
{
Hangup();
}
else if (uas.IsCancelled)
{
logger.LogDebug("The incoming call has been cancelled.");
mediaSession?.Close("call cancelled");
}
else
{
m_cts = new CancellationTokenSource();
var sipRequest = uas.ClientTransaction.TransactionRequest;
MediaSession = mediaSession;
MediaSession.OnRtpEvent += OnRemoteRtpEvent;
//MediaSession.OnRtpClosed += (reason) => Hangup();
MediaSession.OnRtpClosed += (reason) =>
{
if (!MediaSession.IsClosed)
{
logger.LogWarning($"RTP channel was closed with reason {reason}.");
}
};
string sdp = null;
if (!String.IsNullOrEmpty(sipRequest.Body))
{
// The SDP offer was included in the INVITE request.
SDP remoteSdp = SDP.ParseSDPDescription(sipRequest.Body);
MediaSession.setRemoteDescription(new RTCSessionDescription {
sdp = remoteSdp, type = RTCSdpType.offer
});
var sdpAnswer = await MediaSession.createAnswer(null).ConfigureAwait(false);
if (sdpAnswer == null)
{
logger.LogWarning($"Could not generate an SDP answer.");
m_uas.Reject(SIPResponseStatusCodesEnum.NotAcceptable, null);
return;
}
else
{
MediaSession.setLocalDescription(new RTCSessionDescription {
sdp = sdpAnswer, type = RTCSdpType.answer
});
sdp = sdpAnswer.ToString();
}
}
else
{
// No SDP offer was included in the INVITE request need to wait for the ACK.
RTCOfferOptions offerOptions = new RTCOfferOptions {
RemoteSignallingAddress = sipRequest.RemoteSIPEndPoint.GetIPEndPoint().Address
};
var sdpOffer = await MediaSession.createOffer(offerOptions).ConfigureAwait(false);
if (sdpOffer == null)
{
// This shouldn't occur unless we're unable to create an audio/video track.
logger.LogWarning($"Could not generate an SDP answer.");
m_uas.Reject(SIPResponseStatusCodesEnum.NotAcceptable, null);
return;
}
else
{
MediaSession.setLocalDescription(new RTCSessionDescription {
sdp = sdpOffer, type = RTCSdpType.offer
});
sdp = sdpOffer.ToString();
}
}
m_uas = uas;
// In cases where the initial INVITE did not contain an SDP offer the action sequence is:
// - INVITE with no SDP offer received,
// - Reply with OK and an SDP offer,
// - Wait for ACK with SDP answer.
TaskCompletionSource <SIPDialogue> dialogueCreatedTcs = new TaskCompletionSource <SIPDialogue>(TaskCreationOptions.RunContinuationsAsynchronously);
m_uas.OnDialogueCreated += (dialogue) => dialogueCreatedTcs.TrySetResult(dialogue);
m_uas.Answer(m_sdpContentType, sdp, null, SIPDialogueTransferModesEnum.Default, customHeaders);
await Task.WhenAny(dialogueCreatedTcs.Task, Task.Delay(WAIT_DIALOG_TIMEOUT)).ConfigureAwait(false);
if (Dialogue != null)
{
if (MediaSession.remoteDescription == null || MediaSession.remoteDescription.sdp == null)
{
// If the initial INVITE did not contain an offer then the remote description will not yet be set.
var remoteSDP = SDP.ParseSDPDescription(Dialogue.RemoteSDP);
MediaSession.setRemoteDescription(new RTCSessionDescription {
sdp = remoteSDP, type = RTCSdpType.answer
});
}
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
await MediaSession.Start().ConfigureAwait(false);
}
else
{
logger.LogWarning("The attempt to answer a call failed as the dialog was not created. The likely cause is the ACK not being received in time.");
MediaSession.Close("dialog creation failed");
Hangup();
}
}
}
private static void SIPTransportRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
if (sipRequest.Method == SIPMethodsEnum.BYE)
{
var rtpJob = (from job in m_rtpJobs.Values where job.UAS.CallRequest.Header.CallId == sipRequest.Header.CallId select job).FirstOrDefault();
if (rtpJob != null)
{
rtpJob.Stop();
// Call has been hungup by remote end.
Console.WriteLine("Call hungup by client: " + localSIPEndPoint + "<-" + remoteEndPoint + " " + sipRequest.URI.ToString() + ".\n");
Publish(rtpJob.QueueName, "BYE request received from " + remoteEndPoint + " for " + sipRequest.URI.ToString() + ".");
//Console.WriteLine("Request Received " + localSIPEndPoint + "<-" + remoteEndPoint + "\n" + sipRequest.ToString());
//m_uas.SIPDialogue.Hangup(m_sipTransport, null);
SIPResponse okResponse = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.Ok, null);
m_sipTransport.SendResponse(okResponse);
}
else
{
Console.WriteLine("Unmatched BYE request received for " + sipRequest.URI.ToString() + ".\n");
SIPResponse noCallLegResponse = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.CallLegTransactionDoesNotExist, null);
m_sipTransport.SendResponse(noCallLegResponse);
}
}
else if (sipRequest.Method == SIPMethodsEnum.INVITE)
{
Console.WriteLine("Incoming call request: " + localSIPEndPoint + "<-" + remoteEndPoint + " " + sipRequest.URI.ToString() + ".\n");
Publish(sipRequest.URI.User, "INVITE request received from " + remoteEndPoint + " for " + sipRequest.URI.ToString() + ".");
Console.WriteLine(sipRequest.Body);
SIPPacketMangler.MangleSIPRequest(SIPMonitorServerTypesEnum.Unknown, sipRequest, null, LogTraceMessage);
UASInviteTransaction uasTransaction = m_sipTransport.CreateUASTransaction(sipRequest, remoteEndPoint, localSIPEndPoint, null);
var uas = new SIPServerUserAgent(m_sipTransport, null, null, null, SIPCallDirection.In, null, null, LogTraceMessage, uasTransaction);
uas.CallCancelled += UASCallCancelled;
RTPDiagnosticsJob rtpJob = new RTPDiagnosticsJob(m_rtpListenIPAddress, m_publicIPAddress, uas, sipRequest);
string sdpAddress = SDP.GetSDPRTPEndPoint(sipRequest.Body).Address.ToString();
// Only mangle if there is something to change. For example the server could be on the same private subnet in which case it can't help.
IPEndPoint expectedRTPEndPoint = new IPEndPoint(rtpJob.RemoteRTPEndPoint.Address, rtpJob.RemoteRTPEndPoint.Port);
if (IPSocket.IsPrivateAddress(rtpJob.RemoteRTPEndPoint.Address.ToString()))
{
expectedRTPEndPoint.Address = remoteEndPoint.Address;
}
Publish(sipRequest.URI.User, "Advertised RTP remote socket " + rtpJob.RemoteRTPEndPoint + ", expecting from " + expectedRTPEndPoint + ".");
m_rtpJobs.Add(rtpJob.RTPListenEndPoint.Port, rtpJob);
//ThreadPool.QueueUserWorkItem(delegate { StartRTPListener(rtpJob); });
Console.WriteLine(rtpJob.LocalSDP.ToString());
uas.Answer("application/sdp", rtpJob.LocalSDP.ToString(), CallProperties.CreateNewTag(), null, SIPDialogueTransferModesEnum.NotAllowed);
var hangupTimer = new Timer(delegate
{
if (!rtpJob.StopJob)
{
if (uas != null && uas.SIPDialogue != null)
{
if(rtpJob.RTPPacketReceived && !rtpJob.ErrorOnRTPSend)
{
Publish(sipRequest.URI.User, "Test completed. There were no RTP send or receive errors.");
}
else if (!rtpJob.RTPPacketReceived)
{
Publish(sipRequest.URI.User, "Test completed. An error was identified, no RTP packets were received.");
}
else
{
Publish(sipRequest.URI.User, "Test completed. An error was identified, there was a problem when attempting to send an RTP packet.");
}
rtpJob.Stop();
uas.SIPDialogue.Hangup(m_sipTransport, null);
}
}
}, null, HANGUP_TIMEOUT, Timeout.Infinite);
}
else if (sipRequest.Method == SIPMethodsEnum.CANCEL)
{
UASInviteTransaction inviteTransaction = (UASInviteTransaction)m_sipTransport.GetTransaction(SIPTransaction.GetRequestTransactionId(sipRequest.Header.Vias.TopViaHeader.Branch, SIPMethodsEnum.INVITE));
if (inviteTransaction != null)
{
Console.WriteLine("Matching CANCEL request received " + sipRequest.URI.ToString() + ".\n");
Publish(sipRequest.URI.User, "CANCEL request received from " + remoteEndPoint + " for " + sipRequest.URI.ToString() + ".");
SIPCancelTransaction cancelTransaction = m_sipTransport.CreateCancelTransaction(sipRequest, remoteEndPoint, localSIPEndPoint, inviteTransaction);
cancelTransaction.GotRequest(localSIPEndPoint, remoteEndPoint, sipRequest);
}
else
{
Console.WriteLine("No matching transaction was found for CANCEL to " + sipRequest.URI.ToString() + ".\n");
SIPResponse noCallLegResponse = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.CallLegTransactionDoesNotExist, null);
m_sipTransport.SendResponse(noCallLegResponse);
}
}
else
{
Console.WriteLine("SIP " + sipRequest.Method + " request received but no processing has been set up for it, rejecting.\n");
Publish(sipRequest.URI.User, sipRequest.Method + " request received from " + remoteEndPoint + " for " + sipRequest.URI.ToString() + ".");
SIPResponse notAllowedResponse = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.MethodNotAllowed, null);
m_sipTransport.SendResponse(notAllowedResponse);
}
}
/// <summary>
/// Answers the call request contained in the user agent server parameter. Note the
/// <see cref="AcceptCall(SIPRequest)"/> method should be used to create the user agent server.
/// Any existing call will be hungup.
/// </summary>
/// <param name="uas">The user agent server holding the pending call to answer.</param>
/// <param name="mediaSession">The media session used for this call</param>
/// <param name="customHeaders">Custom SIP-Headers to use in Answer.</param>
/// <returns>True if the call was successfully answered or false if there was a problem
/// such as incompatible codecs.</returns>
public async Task <bool> Answer(SIPServerUserAgent uas, IMediaSession mediaSession, string[] customHeaders)
{
// This call is now taking over any existing call.
if (IsCallActive)
{
Hangup();
}
if (uas.IsCancelled)
{
logger.LogDebug("The incoming call has been cancelled.");
mediaSession?.Close("call cancelled");
return(false);
}
else
{
m_cts = new CancellationTokenSource();
var sipRequest = uas.ClientTransaction.TransactionRequest;
MediaSession = mediaSession;
MediaSession.OnRtpEvent += OnRemoteRtpEvent;
MediaSession.OnRtpClosed += (reason) =>
{
if (!MediaSession.IsClosed)
{
logger.LogWarning($"RTP channel was closed with reason {reason}.");
}
};
string sdp = null;
if (!String.IsNullOrEmpty(sipRequest.Body))
{
// The SDP offer was included in the INVITE request.
SDP remoteSdp = SDP.ParseSDPDescription(sipRequest.Body);
var setRemoteResult = MediaSession.SetRemoteDescription(remoteSdp);
if (setRemoteResult != SetDescriptionResultEnum.OK)
{
logger.LogWarning($"Error setting remote description from INVITE {setRemoteResult}.");
uas.Reject(SIPResponseStatusCodesEnum.NotAcceptable, setRemoteResult.ToString());
MediaSession.Close("sdp offer not acceptable");
Hangup();
return(false);
}
else
{
var sdpAnswer = MediaSession.CreateAnswer(null);
sdp = sdpAnswer.ToString();
}
}
else
{
// No SDP offer was included in the INVITE request need to wait for the ACK.
var sdpAnnounceAddress = NetServices.GetLocalAddressForRemote(sipRequest.RemoteSIPEndPoint.GetIPEndPoint().Address);
var sdpOffer = MediaSession.CreateOffer(sdpAnnounceAddress);
sdp = sdpOffer.ToString();
}
m_uas = uas;
// In cases where the initial INVITE did not contain an SDP offer the action sequence is:
// - INVITE with no SDP offer received,
// - Reply with OK and an SDP offer,
// - Wait for ACK with SDP answer.
TaskCompletionSource <SIPDialogue> dialogueCreatedTcs = new TaskCompletionSource <SIPDialogue>(TaskCreationOptions.RunContinuationsAsynchronously);
m_uas.OnDialogueCreated += (dialogue) => dialogueCreatedTcs.TrySetResult(dialogue);
m_uas.Answer(m_sdpContentType, sdp, null, SIPDialogueTransferModesEnum.Default, customHeaders);
await Task.WhenAny(dialogueCreatedTcs.Task, Task.Delay(WAIT_DIALOG_TIMEOUT)).ConfigureAwait(false);
if (Dialogue != null)
{
if (MediaSession.RemoteDescription == null)
{
// If the initial INVITE did not contain an offer then the remote description will not yet be set.
var remoteSDP = SDP.ParseSDPDescription(Dialogue.RemoteSDP);
var setRemoteResult = MediaSession.SetRemoteDescription(remoteSDP);
if (setRemoteResult != SetDescriptionResultEnum.OK)
{
// Failed to set the remote SDP from the ACK request. Only option is to hangup.
logger.LogWarning($"Error setting remote description from ACK {setRemoteResult}.");
MediaSession.Close(setRemoteResult.ToString());
Hangup();
return(false);
}
else
{
// SDP from the ACK request was accepted. Start the RTP session.
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
await MediaSession.Start().ConfigureAwait(false);
return(true);
}
}
else
{
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
await MediaSession.Start().ConfigureAwait(false);
return(true);
}
}
else
{
logger.LogWarning("The attempt to answer a call failed as the dialog was not created. The likely cause is the ACK not being received in time.");
MediaSession.Close("dialog creation failed");
Hangup();
return(false);
}
}
}
/// <summary>
/// Answers the currently accepted call. The call must have been previously accepted using
/// AcceptCall. The user agent is acting asd a server for this operation.
/// </summary>
/// <param name="sdp">The session description payload to send to the remote call party
/// when answering.</param>
public void Answer(SDP sdp)
{
m_uas.Answer(m_sdpContentType, sdp.ToString(), null, SIPDialogueTransferModesEnum.Default);
}