/// <summary>
/// Sends or resends a transaction final response.
/// </summary>
/// <param name="transaction">The transaction to send the final response for.</param>
/// <returns>The result of the send attempt.</returns>
private Task <SocketError> SendTransactionFinalResponse(SIPTransaction transaction)
{
transaction.Retransmits = transaction.Retransmits + 1;
transaction.LastTransmit = DateTime.Now;
if (transaction.InitialTransmit == DateTime.MinValue)
{
transaction.InitialTransmit = transaction.LastTransmit;
}
if (transaction.Retransmits > 1 && !DisableRetransmitSending)
{
transaction.OnRetransmitFinalResponse();
SIPResponseRetransmitTraceEvent?.Invoke(transaction, transaction.TransactionFinalResponse, transaction.Retransmits);
}
if (transaction.Retransmits > 1 && DisableRetransmitSending)
{
return(Task.FromResult(SocketError.Success));
}
else
{
return(m_sipTransport.SendResponseAsync(transaction.TransactionFinalResponse));
}
}
/// <summary>
/// Sends or resends a transaction final response.
/// </summary>
/// <param name="transaction">The transaction to send the final response for.</param>
/// <returns>The result of the send attempt.</returns>
private Task <SocketError> SendTransactionFinalResponse(SIPTransaction transaction)
{
transaction.Retransmits = transaction.Retransmits + 1;
transaction.LastTransmit = DateTime.Now;
if (transaction.InitialTransmit == DateTime.MinValue)
{
transaction.InitialTransmit = transaction.LastTransmit;
}
if (transaction.Retransmits > 1 && !DisableRetransmitSending)
{
transaction.OnRetransmitFinalResponse();
SIPResponseRetransmitTraceEvent?.Invoke(transaction, transaction.TransactionFinalResponse, transaction.Retransmits);
}
if (transaction.Retransmits > 1 && DisableRetransmitSending)
{
return(Task.FromResult(SocketError.Success));
}
else
{
// If retransmits are disabled we must wait for DNS when sending. By default the DNS lookup mechanism
// will silently do nothing if the lookup result is not in the cache and relies on the result
// being ready for a subsequent SIP retransmit. This mechanism won't work if SIP retransmits are disabled.
bool waitForDns = DisableRetransmitSending;
return(m_sipTransport.SendResponseAsync(transaction.TransactionFinalResponse, waitForDns));
}
}
/// <summary>
/// Sends or resends a transaction final response.
/// </summary>
/// <param name="transaction">The transaction to send the final response for.</param>
/// <returns>The result of the send attempt.</returns>
private Task <SocketError> SendTransactionFinalResponse(SIPTransaction transaction)
{
transaction.Retransmits = transaction.Retransmits + 1;
transaction.LastTransmit = DateTime.Now;
if (transaction.InitialTransmit == DateTime.MinValue)
{
transaction.InitialTransmit = transaction.LastTransmit;
}
if (transaction.Retransmits > 1)
{
transaction.OnRetransmitFinalResponse();
SIPResponseRetransmitTraceEvent?.Invoke(transaction, transaction.TransactionFinalResponse, transaction.Retransmits);
}
return(m_sipTransport.SendResponseAsync(transaction.TransactionFinalResponse));
}
/// <summary>
/// Sends or resends a Invite Server transaction provisional response. Only
/// relevant reliable provisional responses as per RFC3262 are supported.
/// </summary>
/// <param name="transaction">The transaction to send the provisional response for.</param>
/// <returns>The result of the send attempt.</returns>
private Task <SocketError> SendTransactionProvisionalResponse(SIPTransaction transaction)
{
transaction.Retransmits = transaction.Retransmits + 1;
transaction.LastTransmit = DateTime.Now;
if (transaction.InitialTransmit == DateTime.MinValue)
{
transaction.InitialTransmit = transaction.LastTransmit;
}
// Provisional response reliable for INVITE-UAS.
if (transaction.Retransmits > 1)
{
transaction.OnRetransmitProvisionalResponse();
SIPResponseRetransmitTraceEvent?.Invoke(transaction, transaction.ReliableProvisionalResponse, transaction.Retransmits);
}
return(m_sipTransport.SendResponseAsync(transaction.ReliableProvisionalResponse));
}