internal UASInviteTransaction(
SIPTransport sipTransport,
SIPRequest sipRequest,
SIPEndPoint dstEndPoint,
SIPEndPoint localSIPEndPoint,
SIPEndPoint outboundProxy)
: base(sipTransport, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy)
{
TransactionType = SIPTransactionTypesEnum.Invite;
m_remoteTag = sipRequest.Header.From.FromTag;
if (sipRequest.Header.To.ToTag == null)
{
// This UAS needs to set the To Tag.
m_localTag = CallProperties.CreateNewTag();
}
else
{
// This is a re-INVITE.
m_localTag = sipRequest.Header.To.ToTag;
}
//logger.Debug("New UASTransaction (" + TransactionId + ") for " + TransactionRequest.URI.ToString() + " to " + RemoteEndPoint + ".");
CDR = new SIPCDR(SIPCallDirection.In, sipRequest.URI, sipRequest.Header.From, sipRequest.Header.CallId, LocalSIPEndPoint, dstEndPoint);
//UpdateTransactionState(SIPTransactionStatesEnum.Proceeding);
TransactionRequestReceived += UASInviteTransaction_TransactionRequestReceived;
TransactionInformationResponseReceived += UASInviteTransaction_TransactionResponseReceived;
TransactionFinalResponseReceived += UASInviteTransaction_TransactionResponseReceived;
TransactionTimedOut += UASInviteTransaction_TransactionTimedOut;
TransactionRemoved += UASInviteTransaction_TransactionRemoved;
}
private void SIPCancelTransaction_TransactionRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
{
try
{
//logger.Debug("CANCEL request received, attempting to locate and cancel transaction.");
//UASInviteTransaction originalTransaction = (UASInviteTransaction)GetTransaction(GetRequestTransactionId(sipRequest.Header.Via.TopViaHeader.Branch, SIPMethodsEnum.INVITE));
SIPResponse cancelResponse;
if (m_originalTransaction != null)
{
//logger.Debug("Transaction found to cancel " + originalTransaction.TransactionId + " type " + originalTransaction.TransactionType + ".");
m_originalTransaction.CancelCall();
cancelResponse = GetCancelResponse(sipRequest, SIPResponseStatusCodesEnum.Ok);
}
else
{
cancelResponse = GetCancelResponse(sipRequest, SIPResponseStatusCodesEnum.CallLegTransactionDoesNotExist);
}
//UpdateTransactionState(SIPTransactionStatesEnum.Completed);
SendFinalResponse(cancelResponse);
}
catch (Exception excp)
{
logger.Error("Exception SIPCancelTransaction GotRequest. " + excp.Message);
}
}
private void SIPNonInviteTransaction_TransactionRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
{
if (NonInviteRequestReceived != null)
{
NonInviteRequestReceived(localSIPEndPoint, remoteEndPoint, this, sipRequest);
}
}
public void RecordDispatch(SIPRequest sipRequest, SIPEndPoint internalEndPoint)
{
lock(m_transactionEndPoints)
{
if (m_transactionEndPoints.ContainsKey(sipRequest.Header.CallId))
{
if (m_transactionEndPoints[sipRequest.Header.CallId] == internalEndPoint.ToString())
{
// The application server end point has not changed for this Call-Id
return;
}
else
{
// The application server end point has changed within the lifetime of the Call-Id. Remove the old mapping.
lock (m_transactionEndPoints)
{
m_transactionEndPoints.Remove(sipRequest.Header.CallId);
}
}
}
m_transactionEndPoints.Add(sipRequest.Header.CallId, internalEndPoint.ToString());
m_transactionIDAddedAt.Add(sipRequest.Header.CallId, DateTime.Now);
//ProxyLogger_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.SIPProxy, SIPMonitorEventTypesEnum.CallDispatcher, "Record dispatch for " + sipRequest.Method + " " + sipRequest.URI.ToString() + " to " + internalEndPoint.ToString() + " (id=" + transactionID + ").", null));
}
if (m_lastRemove < DateTime.Now.AddSeconds(REMOVE_EXPIREDS_SECONDS * -1))
{
RemoveExpiredDispatchRecords();
}
}
internal SIPCancelTransaction(SIPTransport sipTransport, SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, UASInviteTransaction originalTransaction)
: base(sipTransport, sipRequest, dstEndPoint, localSIPEndPoint, originalTransaction.OutboundProxy)
{
m_originalTransaction = originalTransaction;
TransactionType = SIPTransactionTypesEnum.NonInvite;
TransactionRequestReceived += SIPCancelTransaction_TransactionRequestReceived;
TransactionFinalResponseReceived += SIPCancelTransaction_TransactionFinalResponseReceived;
TransactionRemoved += SIPCancelTransaction_TransactionRemoved;
}
internal SIPNonInviteTransaction(SIPTransport sipTransport, SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, SIPEndPoint outboundProxy)
: base(sipTransport, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy)
{
TransactionType = SIPTransactionTypesEnum.NonInvite;
TransactionRequestReceived += SIPNonInviteTransaction_TransactionRequestReceived;
TransactionInformationResponseReceived += SIPNonInviteTransaction_TransactionInformationResponseReceived;
TransactionFinalResponseReceived += SIPNonInviteTransaction_TransactionFinalResponseReceived;
TransactionTimedOut += SIPNonInviteTransaction_TransactionTimedOut;
TransactionRemoved += SIPNonInviteTransaction_TransactionRemoved;
TransactionRequestRetransmit += SIPNonInviteTransaction_TransactionRequestRetransmit;
}
internal UACInviteTransaction(SIPTransport sipTransport, SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, SIPEndPoint outboundProxy)
: base(sipTransport, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy)
{
TransactionType = SIPTransactionTypesEnum.Invite;
m_localTag = sipRequest.Header.From.FromTag;
CDR = new SIPCDR(SIPCallDirection.Out, sipRequest.URI, sipRequest.Header.From, sipRequest.Header.CallId, localSIPEndPoint, dstEndPoint);
TransactionFinalResponseReceived += UACInviteTransaction_TransactionFinalResponseReceived;
TransactionInformationResponseReceived += UACInviteTransaction_TransactionInformationResponseReceived;
TransactionTimedOut += UACInviteTransaction_TransactionTimedOut;
TransactionRequestReceived += UACInviteTransaction_TransactionRequestReceived;
TransactionRemoved += UACInviteTransaction_TransactionRemoved;
}
public static IPAddress GetRequestIPAddress(SIPRequest sipRequest)
{
IPAddress requestIPAddress = null;
string remoteUAStr = sipRequest.Header.ProxyReceivedFrom;
if (!remoteUAStr.IsNullOrBlank())
{
requestIPAddress = SIPEndPoint.ParseSIPEndPoint(remoteUAStr).Address;
}
else if (sipRequest.RemoteSIPEndPoint != null)
{
requestIPAddress = sipRequest.RemoteSIPEndPoint.Address;
}
return requestIPAddress;
}
private SIPResponse GetCancelResponse(SIPRequest sipRequest, SIPResponseStatusCodesEnum sipResponseCode)
{
try
{
SIPResponse cancelResponse = new SIPResponse(sipResponseCode, null, sipRequest.LocalSIPEndPoint);
SIPHeader requestHeader = sipRequest.Header;
cancelResponse.Header = new SIPHeader(requestHeader.From, requestHeader.To, requestHeader.CSeq, requestHeader.CallId);
cancelResponse.Header.CSeqMethod = SIPMethodsEnum.CANCEL;
cancelResponse.Header.Vias = requestHeader.Vias;
cancelResponse.Header.MaxForwards = Int32.MinValue;
return cancelResponse;
}
catch (Exception excp)
{
logger.Error("Exception GetCancelResponse. " + excp.Message);
throw excp;
}
}
/// <param name="rtpListenAddress">The local IP address to establish the RTP listener socket on.</param>
/// <param name="sdpAdvertiseAddress">The public IP address to put into the SDP sent back to the caller.</param>
/// <param name="request">The INVITE request that instigated the RTP diagnostics job.</param>
public RTPDiagnosticsJob(IPAddress rtpListenAddress, IPAddress sdpAdvertiseAddress, SIPServerUserAgent uas, SIPRequest request)
{
m_request = request;
m_remoteSDP = SDP.ParseSDPDescription(request.Body);
RemoteRTPEndPoint = new IPEndPoint(IPAddress.Parse(m_remoteSDP.Connection.ConnectionAddress), m_remoteSDP.Media[0].Port);
UAS = uas;
//m_rawSourceStream = new RawSourceWaveStream(m_outStream, WaveFormat.CreateMuLawFormat(8000, 1));
//m_waveFileWriter = new WaveFileWriter("out.wav", new WaveFormat(8000, 16, 1));
m_waveFileWriter = new WaveFileWriter("out.wav", new WaveFormat(8000, 16, 1));
//m_outPCMStream = WaveFormatConversionStream.CreatePcmStream(m_rawSourceStream);
//m_rawRTPPayloadWriter = new StreamWriter("out.rtp");
//m_rawRTPPayloadReader = new StreamReader("in.rtp");
//IPEndPoint rtpListenEndPoint = null;
IPEndPoint rtpListenEndPoint = null;
NetServices.CreateRandomUDPListener(rtpListenAddress, RTP_PORTRANGE_START, RTP_PORTRANGE_END, m_inUsePorts, out rtpListenEndPoint);
RTPListenEndPoint = rtpListenEndPoint;
m_inUsePorts.Add(rtpListenEndPoint.Port);
//RTPListenEndPoint = new IPEndPoint(rtpListenAddress, RTP_PORTRANGE_START);
m_rtpChannel = new RTPChannel(RTPListenEndPoint);
m_rtpChannel.SampleReceived += SampleReceived;
ThreadPool.QueueUserWorkItem(delegate { GetAudioSamples(); });
LocalSDP = new SDP()
{
SessionId = Crypto.GetRandomString(6),
Address = sdpAdvertiseAddress.ToString(),
SessionName = "sipsorcery",
Timing = "0 0",
Connection = new SDPConnectionInformation(sdpAdvertiseAddress.ToString()),
Media = new List<SDPMediaAnnouncement>()
{
new SDPMediaAnnouncement()
{
Media = SDPMediaTypesEnum.audio,
Port = RTPListenEndPoint.Port,
MediaFormats = new List<SDPMediaFormat>() { new SDPMediaFormat((int)SDPMediaFormatsEnum.PCMU) }
}
}
};
}
/// <summary>
/// Used for incoming calls where an exact match is required on the sipswitch username.
/// </summary>
public DialPlanCommand GetDialPlanExactMatch(SIPRequest sipRequest)
{
try
{
//LastUsed = DateTime.Now;
if (m_commands.Count > 0)
{
bool match = false;
foreach (DialPlanCommand dialPlanCommand in m_commands)
{
switch (dialPlanCommand.Operation)
{
case DialPlanOpsEnum.Equals:
match = (dialPlanCommand.Destination == sipRequest.URI.User);
break;
default:
break;
}
if (match)
{
logger.Debug("Dial Plan Exact Match for " + sipRequest.URI.User + " and " + dialPlanCommand.ToString());
return dialPlanCommand;
}
}
}
return null;
}
catch (Exception excp)
{
logger.Error("Exception GetDialPlanExactMatch. " + excp.Message);
throw excp;
}
}
public SIPEndPoint LookupTransactionID(SIPRequest sipRequest)
{
try
{
SIPEndPoint transactionEndPoint = LookupTransactionID(sipRequest.Header.CallId);
if (transactionEndPoint != null)
{
return transactionEndPoint;
}
else if (sipRequest.Method == SIPMethodsEnum.INVITE && !sipRequest.URI.User.IsNullOrBlank())
{
string toUser = (sipRequest.URI.User.IndexOf('.') != -1) ? sipRequest.URI.User.Substring(sipRequest.URI.User.LastIndexOf('.') + 1) : sipRequest.URI.User;
if (m_userCallbacks.ContainsKey(toUser))
{
SIPEndPoint callbackEndPoint = null;
callbackEndPoint = SIPEndPoint.ParseSIPEndPoint(m_userCallbacks[toUser].DesintationEndPoint);
RecordDispatch(sipRequest, callbackEndPoint);
ProxyLogger_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.SIPProxy, SIPMonitorEventTypesEnum.DialPlan, "SIP Proxy directing incoming call for user " + toUser + " to application server " + callbackEndPoint.ToString() + ".", toUser));
lock (m_userCallbacks)
{
m_userCallbacks.Remove(toUser);
}
return callbackEndPoint;
}
}
return null;
}
catch (Exception excp)
{
logger.Error("Exception LookupTransactionID. " + excp.Message);
return null;
}
}
public bool DoesTransactionExist(SIPRequest sipRequest)
{
if (m_transactionEngine == null)
{
return false;
}
else if (m_transactionEngine.GetTransaction(sipRequest) != null)
{
return true;
}
else
{
return false;
}
}
public UACInviteTransaction CreateUACTransaction(SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, SIPEndPoint outboundProxy, bool sendOkAckManually = false)
{
try
{
if (localSIPEndPoint == null)
{
localSIPEndPoint = GetDefaultSIPEndPoint();
}
CheckTransactionEngineExists();
UACInviteTransaction uacInviteTransaction = new UACInviteTransaction(this, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy, sendOkAckManually);
m_transactionEngine.AddTransaction(uacInviteTransaction);
return uacInviteTransaction;
}
catch (Exception excp)
{
logger.Error("Exception CreateUACTransaction. " + excp.Message);
throw;
}
}
public UASInviteTransaction CreateUASTransaction(SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, SIPEndPoint outboundProxy, bool noCDR = false)
{
try
{
if (localSIPEndPoint == null)
{
localSIPEndPoint = GetDefaultSIPEndPoint();
}
CheckTransactionEngineExists();
UASInviteTransaction uasInviteTransaction = new UASInviteTransaction(this, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy, ContactIPAddress, noCDR);
m_transactionEngine.AddTransaction(uasInviteTransaction);
return uasInviteTransaction;
}
catch (Exception excp)
{
logger.Error("Exception CreateUASTransaction. " + excp);
throw;
}
}
public SIPCancelTransaction CreateCancelTransaction(SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, UASInviteTransaction inviteTransaction)
{
try
{
if (localSIPEndPoint == null)
{
localSIPEndPoint = GetDefaultSIPEndPoint();
}
CheckTransactionEngineExists();
SIPCancelTransaction cancelTransaction = new SIPCancelTransaction(this, sipRequest, dstEndPoint, localSIPEndPoint, inviteTransaction);
m_transactionEngine.AddTransaction(cancelTransaction);
return cancelTransaction;
}
catch (Exception excp)
{
logger.Error("Exception CreateUASTransaction. " + excp);
throw;
}
}
public SIPNonInviteTransaction CreateNonInviteTransaction(SIPRequest sipRequest, SIPEndPoint dstEndPoint, SIPEndPoint localSIPEndPoint, SIPEndPoint outboundProxy)
{
try
{
if (localSIPEndPoint == null)
{
localSIPEndPoint = GetDefaultSIPEndPoint();
}
CheckTransactionEngineExists();
SIPNonInviteTransaction nonInviteTransaction = new SIPNonInviteTransaction(this, sipRequest, dstEndPoint, localSIPEndPoint, outboundProxy);
m_transactionEngine.AddTransaction(nonInviteTransaction);
return nonInviteTransaction;
}
catch (Exception excp)
{
logger.Error("Exception CreateNonInviteTransaction. " + excp.Message);
throw;
}
}
public bool Exists(SIPRequest sipRequest)
{
return(GetTransaction(sipRequest) != null);
}
public static SIPResponse GetResponse(SIPRequest sipRequest, SIPResponseStatusCodesEnum responseCode, string reasonPhrase)
{
try
{
SIPResponse response = new SIPResponse(responseCode, reasonPhrase, sipRequest.LocalSIPEndPoint);
if (reasonPhrase != null)
{
response.ReasonPhrase = reasonPhrase;
}
SIPHeader requestHeader = sipRequest.Header;
SIPFromHeader from = (requestHeader == null || requestHeader.From != null) ? requestHeader.From : new SIPFromHeader(null, new SIPURI(sipRequest.URI.Scheme, sipRequest.LocalSIPEndPoint), null);
SIPToHeader to = (requestHeader == null || requestHeader.To != null) ? requestHeader.To : new SIPToHeader(null, new SIPURI(sipRequest.URI.Scheme, sipRequest.LocalSIPEndPoint), null);
int cSeq = (requestHeader == null || requestHeader.CSeq != -1) ? requestHeader.CSeq : 1;
string callId = (requestHeader == null || requestHeader.CallId != null) ? requestHeader.CallId : CallProperties.CreateNewCallId();
response.Header = new SIPHeader(from, to, cSeq, callId);
response.Header.CSeqMethod = (requestHeader != null) ? requestHeader.CSeqMethod : SIPMethodsEnum.NONE;
if (requestHeader == null || requestHeader.Vias == null || requestHeader.Vias.Length == 0)
{
response.Header.Vias.PushViaHeader(new SIPViaHeader(sipRequest.RemoteSIPEndPoint, CallProperties.CreateBranchId()));
}
else
{
response.Header.Vias = requestHeader.Vias;
}
response.Header.MaxForwards = Int32.MinValue;
response.Header.Allow = ALLOWED_SIP_METHODS;
return response;
}
catch (Exception excp)
{
logger.Error("Exception SIPTransport GetResponse. " + excp.Message);
throw excp;
}
}
public void SendRequest(SIPRequest sipRequest)
{
if (m_sipChannels.Count == 0)
{
throw new ApplicationException("No channels are configured in the SIP transport layer. The request could not be sent.");
}
SIPDNSLookupResult dnsResult = GetRequestEndPoint(sipRequest, null, true);
if (dnsResult.LookupError != null)
{
SIPResponse unresolvableResponse = GetResponse(sipRequest, SIPResponseStatusCodesEnum.AddressIncomplete, "DNS resolution for " + dnsResult.URI.Host + " failed " + dnsResult.LookupError);
SendResponse(unresolvableResponse);
}
else if (dnsResult.Pending)
{
// The DNS lookup is still in progress, ignore this request and rely on the fact that the transaction retransmit mechanism will send another request.
return;
}
else
{
SIPEndPoint requestEndPoint = dnsResult.GetSIPEndPoint();
if (requestEndPoint != null && requestEndPoint.Address.Equals(BlackholeAddress))
{
// Ignore packet, it's destined for the blackhole.
return;
}
else if (requestEndPoint != null)
{
SendRequest(requestEndPoint, sipRequest);
}
else
{
throw new ApplicationException("SIP Transport could not send request as end point could not be determined.\r\n" + sipRequest.ToString());
}
}
}
private void SIPNonInviteTransaction_TransactionRequestRetransmit(SIPTransaction sipTransaction, SIPRequest sipRequest, int retransmitNumber)
{
if (NonInviteTransactionRequestRetransmit != null)
{
NonInviteTransactionRequestRetransmit(sipTransaction, sipRequest, retransmitNumber);
}
}
public SIPRequest GetRequest(SIPMethodsEnum method, SIPURI uri, SIPToHeader to, SIPEndPoint localSIPEndPoint)
{
if (localSIPEndPoint == null)
{
localSIPEndPoint = GetDefaultSIPEndPoint();
}
SIPRequest request = new SIPRequest(method, uri);
request.LocalSIPEndPoint = localSIPEndPoint;
SIPContactHeader contactHeader = new SIPContactHeader(null, new SIPURI(SIPSchemesEnum.sip, localSIPEndPoint));
SIPFromHeader fromHeader = new SIPFromHeader(null, contactHeader.ContactURI, CallProperties.CreateNewTag());
SIPHeader header = new SIPHeader(contactHeader, fromHeader, to, 1, CallProperties.CreateNewCallId());
request.Header = header;
header.CSeqMethod = method;
header.Allow = ALLOWED_SIP_METHODS;
SIPViaHeader viaHeader = new SIPViaHeader(localSIPEndPoint, CallProperties.CreateBranchId());
header.Vias.PushViaHeader(viaHeader);
return request;
}
public SIPTransaction GetTransaction(SIPRequest sipRequest)
{
CheckTransactionEngineExists();
return m_transactionEngine.GetTransaction(sipRequest);
}
/// <summary>
/// Transaction matching see RFC3261 17.1.3 & 17.2.3 for matching client and server transactions respectively.
/// IMPORTANT NOTE this transaction matching applies to all requests and responses EXCEPT ACK requests to 2xx responses see 13.2.2.4.
/// For ACK's to 2xx responses the ACK represents a separate transaction. However for a UAS sending an INVITE response the ACK still has to be
/// matched to an existing server transaction in order to transition it to a Confirmed state.
///
/// ACK's:
/// - The ACK for a 2xx response will have the same CallId, From Tag and To Tag.
/// - An ACK for a non-2xx response will have the same branch ID as the INVITE whose response it acknowledges.
///
/// PRACK Requests:
/// (From RFC3262)
/// A matching PRACK is defined as one within the same dialog as the response, and
/// whose method, CSeq-num, and response-num in the RAck header field
/// match, respectively, the method from the CSeq, the sequence number
/// from the CSeq, and the sequence number from the RSeq of the reliable
/// provisional response.
/// </summary>
/// <param name="sipRequest">The request to attempt to locate a matching transaction for.</param>
/// <returns>A matching transaction or null if no match found.</returns>
public SIPTransaction GetTransaction(SIPRequest sipRequest)
{
// The branch is mandatory but it doesn't stop some UA's not setting it.
if (sipRequest.Header.Vias.TopViaHeader.Branch == null || sipRequest.Header.Vias.TopViaHeader.Branch.Trim().Length == 0)
{
return(null);
}
SIPMethodsEnum transactionMethod = (sipRequest.Method != SIPMethodsEnum.ACK) ? sipRequest.Method : SIPMethodsEnum.INVITE;
string transactionId = SIPTransaction.GetRequestTransactionId(sipRequest.Header.Vias.TopViaHeader.Branch, transactionMethod);
string contactAddress = (sipRequest.Header.Contact != null && sipRequest.Header.Contact.Count > 0) ? sipRequest.Header.Contact[0].ToString() : "no contact";
lock (m_transactions)
{
if (transactionId != null && m_transactions.ContainsKey(transactionId))
{
return(m_transactions[transactionId]);
}
else
{
// No normal match found so look fo a 2xx INVITE response waiting for an ACK.
if (sipRequest.Method == SIPMethodsEnum.ACK)
{
//logger.LogDebug("Looking for ACK transaction, branchid=" + sipRequest.Header.Via.TopViaHeader.Branch + ".");
foreach (SIPTransaction transaction in m_transactions.Values)
{
// According to the standard an ACK should only not get matched by the branchid on the original INVITE for a non-2xx response. However
// my Cisco phone created a new branchid on ACKs to 487 responses and since the Cisco also used the same Call-ID and From tag on the initial
// unauthenticated request and the subsequent authenticated request the condition below was found to be the best way to match the ACK.
/*if (transaction.TransactionType == SIPTransactionTypesEnum.Invite && transaction.TransactionFinalResponse != null && transaction.TransactionState == SIPTransactionStatesEnum.Completed)
* {
* if (transaction.TransactionFinalResponse.Header.CallId == sipRequest.Header.CallId &&
* transaction.TransactionFinalResponse.Header.To.ToTag == sipRequest.Header.To.ToTag &&
* transaction.TransactionFinalResponse.Header.From.FromTag == sipRequest.Header.From.FromTag)
* {
* return transaction;
* }
* }*/
// As an experiment going to try matching on the Call-ID. This field seems to be unique and therefore the chance
// of collisions seemingly very slim. As a safeguard if there happen to be two transactions with the same Call-ID in the list the match will not be made.
// One case where the Call-Id match breaks down is for in-Dialogue requests in that case there will be multiple transactions with the same Call-ID and tags.
//if (transaction.TransactionType == SIPTransactionTypesEnum.Invite && transaction.TransactionFinalResponse != null && transaction.TransactionState == SIPTransactionStatesEnum.Completed)
if ((transaction.TransactionType == SIPTransactionTypesEnum.InviteClient || transaction.TransactionType == SIPTransactionTypesEnum.InviteServer) &&
transaction.TransactionFinalResponse != null)
{
if (transaction.TransactionRequest.Header.CallId == sipRequest.Header.CallId &&
transaction.TransactionFinalResponse.Header.To.ToTag == sipRequest.Header.To.ToTag &&
transaction.TransactionFinalResponse.Header.From.FromTag == sipRequest.Header.From.FromTag &&
transaction.TransactionFinalResponse.Header.CSeq == sipRequest.Header.CSeq)
{
//logger.LogInformation("ACK for contact=" + contactAddress + ", cseq=" + sipRequest.Header.CSeq + " was matched by callid, tags and cseq.");
return(transaction);
}
else if (transaction.TransactionRequest.Header.CallId == sipRequest.Header.CallId &&
transaction.TransactionFinalResponse.Header.CSeq == sipRequest.Header.CSeq &&
IsCallIdUniqueForPending(sipRequest.Header.CallId))
{
string requestEndPoint = (sipRequest.RemoteSIPEndPoint != null) ? sipRequest.RemoteSIPEndPoint.ToString() : " ? ";
//logger.LogInformation("ACK for contact=" + contactAddress + ", cseq=" + sipRequest.Header.CSeq + " was matched using Call-ID mechanism (to tags: " + transaction.TransactionFinalResponse.Header.To.ToTag + "=" + sipRequest.Header.To.ToTag + ", from tags:" + transaction.TransactionFinalResponse.Header.From.FromTag + "=" + sipRequest.Header.From.FromTag + ").");
return(transaction);
}
}
}
}
else if (sipRequest.Method == SIPMethodsEnum.PRACK)
{
foreach (SIPTransaction transaction in m_transactions.Values)
{
if (transaction.TransactionType == SIPTransactionTypesEnum.InviteServer)
{
if (transaction.TransactionRequest.Header.CallId == sipRequest.Header.CallId &&
//transaction.ReliableProvisionalResponse.Header.To.ToTag == sipRequest.Header.To.ToTag &&
transaction.ReliableProvisionalResponse.Header.From.FromTag == sipRequest.Header.From.FromTag &&
transaction.ReliableProvisionalResponse.Header.CSeq == sipRequest.Header.RAckCSeq &&
transaction.ReliableProvisionalResponse.Header.RSeq == sipRequest.Header.RAckRSeq &&
transaction.ReliableProvisionalResponse.Header.CSeqMethod == sipRequest.Header.RAckCSeqMethod)
{
logger.LogInformation("PRACK for contact=" + contactAddress + ", cseq=" + sipRequest.Header.CSeq + " was matched by callid, tags and cseq.");
return(transaction);
}
}
}
}
return(null);
}
}
}
public void ACKReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
UpdateTransactionState(SIPTransactionStatesEnum.Confirmed);
// Need the ACK request in case it contains a body with an SDP answer.
AckRequest = sipRequest;
OnAckRequestReceived?.Invoke(localSIPEndPoint, remoteEndPoint, this, sipRequest);
}
private Task <SocketError> UACInviteTransaction_TransactionRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
{
logger.LogWarning("UACInviteTransaction received unexpected request, " + sipRequest.Method + " from " + remoteEndPoint.ToString() + ", ignoring.");
return(Task.FromResult(SocketError.Fault));
}
private Task <SocketError> UASInviteTransaction_OnAckRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
{
return(OnAckReceived?.Invoke(localSIPEndPoint, remoteEndPoint, this, sipRequest));
}
/// <summary>
/// PRACK request received to acknowledge the last provisional response that was sent.
/// </summary>
/// <param name="localSIPEndPoint">The SIP socket the request was received on.</param>
/// <param name="remoteEndPoint">The remote SIP socket the request originated from.</param>
/// <param name="sipRequest">The PRACK request.</param>
public void PRACKReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
if (m_transactionState == SIPTransactionStatesEnum.Proceeding && RSeq == sipRequest.Header.RAckRSeq)
{
Logger.Logger.Debug(
"PRACK request matched the current outstanding provisional response, setting as delivered.");
DeliveryPending = false;
}
// We don't keep track of previous provisional response ACK's so always return OK if the request matched the
// transaction and got this far.
var prackResponse = SIPResponse.GetResponse(sipRequest, SIPResponseStatusCodesEnum.Ok, null);
_ = m_sipTransport.SendResponseAsync(prackResponse);
}
/// <summary>
/// Based on the information in the SIP request attempts to determine the end point the request should
/// be sent to.
/// </summary>
public SIPDNSLookupResult GetRequestEndPoint(SIPRequest sipRequest, SIPEndPoint outboundProxy, bool async)
{
SIPURI lookupURI = (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0) ? sipRequest.Header.Routes.TopRoute.URI : sipRequest.URI;
if (outboundProxy != null)
{
return new SIPDNSLookupResult(lookupURI, outboundProxy);
}
else
{
//return GetURIEndPoint(sipRequest.URI, async);
return GetURIEndPoint(lookupURI, async);
}
}
public void GotRequest(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
FireTransactionTraceMessage(
$"Transaction received Request {localSIPEndPoint.ToString()}<-{remoteEndPoint.ToString()}: {sipRequest.StatusLine}");
TransactionRequestReceived?.Invoke(localSIPEndPoint, remoteEndPoint, this, sipRequest);
}
/// <summary>
/// This function performs processing on a request to handle any actions that need to be taken based on the Route header.
/// </summary>
/// <remarks>
/// The main sections in the RFC3261 dealing with Route header processing are sections 12.2.1.1 for request processing and
/// 16.4 for proxy processing.
/// The steps to process requests for Route headers are:
/// 1. If route set is empty no further action is required, forward to destination resolved from request URI,
/// 2. If the request URI is identified as a value that was previously set as a Route by this SIP agent it means the
/// previous hop was a strict router. Replace the reqest URI with the last Route header and go to next step,
/// 3. If the top most route header was set by this SIP agent then remove it and go to next step,
/// 4. If the top most route set does contain the lr parameter then forward to the destination resolved by it,
/// 5. If the top most route header does NOT contain the lr parameter is must be popped and inserted as the request URI
/// and the original request URI must be added to the end of the route set, forward to destination resolved from request URI,
/// </remarks>
public void PreProcessRouteInfo(SIPRequest sipRequest)
{
// If there are no routes defined then there is nothing to do.
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
// If this stack's route URI is being used as the request URI then it will have the loose route parameter (see remarks step 2).
if (sipRequest.URI.Parameters.Has(m_looseRouteParameter))
{
foreach (SIPChannel sipChannel in m_sipChannels.Values)
{
if (sipRequest.URI.ToSIPEndPoint() == sipChannel.SIPChannelEndPoint)
{
// The request URI was this router's address so it was set by a strict router.
// Replace the URI with the original SIP URI that is stored at the end of the route header.
sipRequest.URI = sipRequest.Header.Routes.BottomRoute.URI;
sipRequest.Header.Routes.RemoveBottomRoute();
}
}
}
// The possibility of a strict router on the previous hop has now been handled.
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
// Check whether the top route header belongs to this proxy (see remarks step 3).
if (!sipRequest.Header.Routes.TopRoute.IsStrictRouter)
{
foreach (SIPChannel sipChannel in m_sipChannels.Values)
{
if (sipRequest.Header.Routes.TopRoute.ToSIPEndPoint() == sipChannel.SIPChannelEndPoint)
{
// Remove the top route as it belongs to this proxy.
sipRequest.ReceivedRoute = sipRequest.Header.Routes.PopRoute();
break;
}
}
}
// Check whether the top route header is a strict router and if so adjust the request accordingly (see remarks step 5).
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
if (sipRequest.Header.Routes.TopRoute.IsStrictRouter)
{
// Put the strict router's uri into the request URI and place the original request URI at the end of the route set.
SIPRoute strictRoute = sipRequest.Header.Routes.PopRoute();
SIPRoute uriRoute = new SIPRoute(sipRequest.URI);
sipRequest.Header.Routes.AddBottomRoute(uriRoute);
sipRequest.URI = strictRoute.URI;
}
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <param name="ringTimeout"></param>
/// <param name="answeredCallLimit"></param>
/// <param name="redirectMode"></param>
/// <param name="clientTransaction"></param>
/// <param name="keepScriptAlive">If false will let the dial plan engine know the script has finished and the call is answered. For applications
/// like Callback which need to have two calls answered it will be true.</param>
/// <returns></returns>
private DialPlanAppResult Dial(
string data,
int ringTimeout,
int answeredCallLimit,
SIPRequest clientRequest,
CRMHeaders contact)
{
if (m_dialPlanContext.IsAnswered)
{
Log("The call has already been answered the Dial command was not processed.");
return DialPlanAppResult.AlreadyAnswered;
}
else if (data.IsNullOrBlank())
{
Log("The dial string cannot be empty when calling Dial.");
return DialPlanAppResult.Error;
}
else if (m_callInitialisationCount > MAX_CALLS_ALLOWED)
{
Log("You have exceeded the maximum allowed calls for a dialplan execution.");
return DialPlanAppResult.Error;
}
else
{
Log("Commencing Dial with: " + data + ".");
DialPlanAppResult result = DialPlanAppResult.Unknown;
m_waitForCallCompleted = new ManualResetEvent(false);
SIPResponseStatusCodesEnum answeredStatus = SIPResponseStatusCodesEnum.None;
string answeredReason = null;
string answeredContentType = null;
string answeredBody = null;
SIPDialogue answeredDialogue = null;
SIPDialogueTransferModesEnum uasTransferMode = SIPDialogueTransferModesEnum.Default;
int numberLegs = 0;
QueueNewCallDelegate queueNewCall = (m_callManager != null) ? m_callManager.QueueNewCall : (QueueNewCallDelegate)null;
m_currentCall = new ForkCall(m_sipTransport, FireProxyLogEvent, queueNewCall, m_dialStringParser, Username, m_adminMemberId, m_outboundProxySocket, m_callManager, m_dialPlanContext, out LastDialled);
m_currentCall.CallProgress += m_dialPlanContext.CallProgress;
m_currentCall.CallFailed += (status, reason, headers) =>
{
LastFailureStatus = status;
LastFailureReason = reason;
result = DialPlanAppResult.Failed;
m_waitForCallCompleted.Set();
};
m_currentCall.CallAnswered += (status, reason, toTag, headers, contentType, body, dialogue, transferMode) =>
{
answeredStatus = status;
answeredReason = reason;
answeredContentType = contentType;
answeredBody = body;
answeredDialogue = dialogue;
uasTransferMode = transferMode;
result = DialPlanAppResult.Answered;
m_waitForCallCompleted.Set();
};
try
{
Queue<List<SIPCallDescriptor>> callsQueue = m_dialStringParser.ParseDialString(
DialPlanContextsEnum.Script,
clientRequest,
data,
m_customSIPHeaders,
m_customContentType,
m_customContent,
m_dialPlanContext.CallersNetworkId,
m_customFromName,
m_customFromUser,
m_customFromHost,
contact,
ServiceLevel);
List<SIPCallDescriptor>[] callListArray = callsQueue.ToArray();
callsQueue.ToList().ForEach((list) => numberLegs += list.Count);
if (numberLegs == 0)
{
Log("The dial string did not result in any call legs.");
return DialPlanAppResult.Error;
}
else
{
m_callInitialisationCount += numberLegs;
if (m_callInitialisationCount > MAX_CALLS_ALLOWED)
{
Log("You have exceeded the maximum allowed calls for a dialplan execution.");
return DialPlanAppResult.Error;
}
}
m_currentCall.Start(callsQueue);
// Wait for an answer.
if (ringTimeout <= 0 || ringTimeout * 1000 > m_maxRingTime)
{
ringTimeout = m_maxRingTime;
}
else
{
ringTimeout = ringTimeout * 1000;
}
ExtendScriptTimeout(ringTimeout / 1000 + DEFAULT_CREATECALL_RINGTIME);
DateTime startTime = DateTime.Now;
if (m_waitForCallCompleted.WaitOne(ringTimeout, false))
{
if (!m_clientCallCancelled)
{
if (result == DialPlanAppResult.Answered)
{
// The call limit duration is only used if there hasn't already been a per leg duration set on the call.
if (answeredCallLimit > 0 && answeredDialogue.CallDurationLimit == 0)
{
answeredDialogue.CallDurationLimit = answeredCallLimit;
}
m_dialPlanContext.CallAnswered(answeredStatus, answeredReason, null, null, answeredContentType, answeredBody, answeredDialogue, uasTransferMode);
// Dial plan script stops once there is an answered call to bridge to or the client call is cancelled.
Log("Dial command was successfully answered in " + DateTime.Now.Subtract(startTime).TotalSeconds.ToString("0.00") + "s.");
// Do some Google Analytics call tracking.
if (answeredDialogue.RemoteUserField != null)
{
SendGoogleAnalyticsEvent("Call", "Answered", answeredDialogue.RemoteUserField.URI.Host, 1);
}
m_executingScript.StopExecution();
}
else if (result == DialPlanAppResult.Failed)
{
// Check whether any of the responses were redirects.
if (LastDialled != null && LastDialled.Count > 0)
{
var redirect = (from trans in LastDialled
where trans.TransactionFinalResponse != null && trans.TransactionFinalResponse.StatusCode >= 300 &&
trans.TransactionFinalResponse.StatusCode <= 399 && trans.TransactionFinalResponse.Header.Contact != null
&& trans.TransactionFinalResponse.Header.Contact.Count > 0
select trans.TransactionFinalResponse).FirstOrDefault();
if (redirect != null)
{
m_redirectResponse = redirect;
m_redirectURI = RedirectResponse.Header.Contact[0].ContactURI;
result = DialPlanAppResult.Redirect;
}
}
}
}
}
else
{
if (!m_clientCallCancelled)
{
// Call timed out.
m_currentCall.CancelNotRequiredCallLegs(CallCancelCause.TimedOut);
result = DialPlanAppResult.TimedOut;
}
}
if (m_clientCallCancelled)
{
Log("Dial command was halted by cancellation of client call after " + DateTime.Now.Subtract(startTime).TotalSeconds.ToString("#.00") + "s.");
m_executingScript.StopExecution();
}
return result;
}
catch (ThreadAbortException)
{
return DialPlanAppResult.Unknown;
}
catch (Exception excp)
{
logger.Error("Exception DialPlanScriptFacade Dial. " + excp.Message);
return DialPlanAppResult.Error;
}
}
}
public void SendRequest(SIPEndPoint dstEndPoint, SIPRequest sipRequest)
{
if (dstEndPoint != null && dstEndPoint.Address.Equals(BlackholeAddress))
{
// Ignore packet, it's destined for the blackhole.
return;
}
if (m_sipChannels.Count == 0)
{
throw new ApplicationException("No channels are configured in the SIP transport layer. The request could not be sent.");
}
SIPChannel sipChannel = null;
if (sipRequest.LocalSIPEndPoint != null)
{
sipChannel = FindSIPChannel(sipRequest.LocalSIPEndPoint);
sipChannel = sipChannel ?? GetDefaultChannel(sipRequest.LocalSIPEndPoint.Protocol);
}
else
{
sipChannel = GetDefaultChannel(dstEndPoint.Protocol);
}
if (sipChannel != null)
{
SendRequest(sipChannel, dstEndPoint, sipRequest);
}
else
{
throw new ApplicationException("A default SIP channel could not be found for protocol " + sipRequest.LocalSIPEndPoint.Protocol + " when sending SIP request.");
}
}
public void ACKReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
UpdateTransactionState(SIPTransactionStatesEnum.Confirmed);
}
private void SendRequest(SIPChannel sipChannel, SIPEndPoint dstEndPoint, SIPRequest sipRequest)
{
try
{
if (dstEndPoint != null && dstEndPoint.Address.Equals(BlackholeAddress))
{
// Ignore packet, it's destined for the blackhole.
return;
}
if (m_sipChannels.Count == 0)
{
throw new ApplicationException("No channels are configured in the SIP transport layer. The request could not be sent.");
}
sipRequest.Header.ContentLength = (sipRequest.Body.NotNullOrBlank()) ? Encoding.UTF8.GetByteCount(sipRequest.Body) : 0;
if (sipChannel.IsTLS)
{
sipChannel.Send(dstEndPoint.GetIPEndPoint(), Encoding.UTF8.GetBytes(sipRequest.ToString()), sipRequest.URI.Host);
}
else
{
sipChannel.Send(dstEndPoint.GetIPEndPoint(), Encoding.UTF8.GetBytes(sipRequest.ToString()));
}
if (SIPRequestOutTraceEvent != null)
{
FireSIPRequestOutTraceEvent(sipChannel.SIPChannelEndPoint, dstEndPoint, sipRequest);
}
}
catch (ApplicationException appExcp)
{
logger.Warn("ApplicationException SIPTransport SendRequest. " + appExcp.Message);
SIPResponse errorResponse = GetResponse(sipRequest, SIPResponseStatusCodesEnum.InternalServerError, appExcp.Message);
// Remove any Via headers, other than the last one, that are for sockets hosted by this process.
while (errorResponse.Header.Vias.Length > 0)
{
if (IsLocalSIPEndPoint(SIPEndPoint.ParseSIPEndPoint(errorResponse.Header.Vias.TopViaHeader.ReceivedFromAddress)))
{
errorResponse.Header.Vias.PopTopViaHeader();
}
else
{
break;
}
}
if (errorResponse.Header.Vias.Length == 0)
{
logger.Warn("Could not send error response for " + appExcp.Message + " as no non-local Via headers were available.");
}
else
{
SendResponse(errorResponse);
}
}
}
private void UASInviteTransaction_TransactionRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
{
try
{
if (TransactionState == SIPTransactionStatesEnum.Terminated)
{
logger.LogDebug("Request received by UASInviteTransaction for a terminated transaction, ignoring.");
}
else if (sipRequest.Method != SIPMethodsEnum.INVITE)
{
logger.LogWarning("Unexpected " + sipRequest.Method + " passed to UASInviteTransaction.");
}
else
{
if (TransactionState != SIPTransactionStatesEnum.Trying)
{
SIPResponse tryingResponse = GetInfoResponse(m_transactionRequest, SIPResponseStatusCodesEnum.Trying);
SendProvisionalResponse(tryingResponse);
}
// Notify new call subscribers.
if (NewCallReceived != null)
{
NewCallReceived(localSIPEndPoint, remoteEndPoint, this, sipRequest);
}
else
{
// Nobody wants to answer this call so return an error response.
SIPResponse declinedResponse = SIPTransport.GetResponse(sipRequest, SIPResponseStatusCodesEnum.Decline, "Nothing listening");
SendFinalResponse(declinedResponse);
}
}
}
catch (Exception excp)
{
logger.LogError("Exception UASInviteTransaction GotRequest. " + excp.Message);
}
}
public DialPlanScriptFacade(
SIPTransport sipTransport,
DialPlanExecutingScript executingScript,
SIPMonitorLogDelegate logDelegate,
DialogueBridgeCreatedDelegate createBridge,
SIPRequest sipRequest,
SIPCallDirection callDirection,
DialPlanContext dialPlanContext,
GetCanonicalDomainDelegate getCanonicalDomain,
ISIPCallManager callManager,
//SIPAssetPersistor<SIPAccount> sipAccountPersistor,
//SIPAssetPersistor<SIPDialPlan> sipDialPlanPersistor,
//SIPAssetPersistor<SIPDialogueAsset> sipDialoguePersistor,
//SIPAssetGetListDelegate<SIPRegistrarBinding> getSIPAccountBindings,
SIPSorceryPersistor sipSorceryPersistor,
SIPEndPoint outboundProxySocket,
DialPlanEngine dialPlanEngine
)
{
m_sipTransport = sipTransport;
m_executingScript = executingScript;
m_dialPlanLogDelegate = logDelegate;
CreateBridge_External = createBridge;
m_sipRequest = sipRequest;
m_callDirection = callDirection;
m_dialPlanContext = dialPlanContext;
m_getCanonicalDomainDelegate = getCanonicalDomain;
m_callManager = callManager;
//m_sipAccountPersistor = sipAccountPersistor;
//m_sipDialPlanPersistor = sipDialPlanPersistor;
//m_sipDialoguePersistor = sipDialoguePersistor;
//GetSIPAccountBindings_External = getSIPAccountBindings;
m_sipSorceryPersistor = sipSorceryPersistor;
m_outboundProxySocket = outboundProxySocket;
m_executingScript.Cleanup = CleanupDialPlanScript;
if (m_dialPlanContext != null)
{
m_username = dialPlanContext.Owner;
m_adminMemberId = dialPlanContext.AdminMemberId;
m_sipProviders = dialPlanContext.SIPProviders;
m_dialPlanContext.TraceLog.AppendLine("DialPlan=> Dialplan trace commenced at " + DateTime.Now.ToString("dd MMM yyyy HH:mm:ss:fff") + ".");
m_dialPlanContext.CallCancelledByClient += ClientCallTerminated;
SIPAssetGetDelegate<SIPAccount> getSIPAccount = null;
if (m_sipSorceryPersistor != null && m_sipSorceryPersistor.SIPAccountsPersistor != null)
{
getSIPAccount = m_sipSorceryPersistor.SIPAccountsPersistor.Get;
}
m_dialStringParser = new DialStringParser(m_sipTransport, m_dialPlanContext.Owner, m_dialPlanContext.SIPAccount, m_sipProviders, getSIPAccount, m_sipSorceryPersistor.SIPRegistrarBindingPersistor.Get, m_getCanonicalDomainDelegate, logDelegate, m_dialPlanContext.SIPDialPlan.DialPlanName);
}
}
private void FireSIPRequestOutTraceEvent(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPRequest sipRequest)
{
try
{
if (SIPRequestOutTraceEvent != null)
{
SIPRequestOutTraceEvent(localSIPEndPoint, remoteEndPoint, sipRequest);
}
}
catch (Exception excp)
{
logger.Error("Exception FireSIPRequestOutTraceEvent. " + excp.Message);
}
}
private void LogSIPRequestOut(SIPEndPoint localSIPEndPoint, SIPEndPoint endPoint, SIPRequest sipRequest)
{
string message = "App Svr Sent: " + localSIPEndPoint.ToString() + "->" + endPoint.ToString() + "\r\n" + sipRequest.ToString();
//logger.Debug("as: request out " + sipRequest.Method + " " + localSIPEndPoint.ToString() + "->" + endPoint.ToString() + ", callid=" + sipRequest.Header.CallId + ".");
string fromUser = (sipRequest.Header.From != null && sipRequest.Header.From.FromURI != null) ? sipRequest.Header.From.FromURI.User : "******";
FireSIPMonitorEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.AppServer, SIPMonitorEventTypesEnum.FullSIPTrace, message, fromUser, localSIPEndPoint, endPoint));
}
private void SIPNonInviteTransaction_TransactionRequestRetransmit(SIPTransaction sipTransaction, SIPRequest sipRequest, int retransmitNumber)
{
NonInviteTransactionRequestRetransmit?.Invoke(sipTransaction, sipRequest, retransmitNumber);
}