/// <summary>
/// This method is called when new response is received.
/// </summary>
/// <param name="e">Response event arguments.</param>
private void OnResponseReceived(SIP_ResponseReceivedEventArgs e)
{
if ((m_ProxyMode & SIP_ProxyMode.B2BUA) != 0)
{
m_pB2BUA.OnResponseReceived(e);
}
else
{
/* This method is called when stateless proxy gets response or statefull proxy
* has no matching server transaction.
*/
/* RFC 3261 16.11.
* When a response arrives at a stateless proxy, the proxy MUST inspect the sent-by
* value in the first (topmost) Via header field value. If that address matches the proxy,
* (it equals a value this proxy has inserted into previous requests) the proxy MUST
* remove that header field value from the response and forward the result to the
* location indicated in the next Via header field value.
*/
// Just remove topmost Via:, sent-by check is done in transport layer.
e.Response.Via.RemoveTopMostValue();
if ((m_ProxyMode & SIP_ProxyMode.Statefull) != 0)
{
// We should not reach here. This happens when no matching client transaction found.
// RFC 3161 18.1.2 orders to forward them statelessly.
m_pStack.TransportLayer.SendResponse(e.Response);
}
else if ((m_ProxyMode & SIP_ProxyMode.Stateless) != 0)
{
m_pStack.TransportLayer.SendResponse(e.Response);
}
}
}
/// <summary>
/// This method is called when new response is received.
/// </summary>
/// <param name="e">Response event arguments.</param>
private void OnResponseReceived(SIP_ResponseReceivedEventArgs e)
{
if ((m_ProxyMode & SIP_ProxyMode.B2BUA) != 0)
{
m_pB2BUA.OnResponseReceived(e);
}
else if ((m_ProxyMode & SIP_ProxyMode.Statefull) != 0)
{
/* RFC 6026 7.3. Proxy Considerations.
* This document changes the behavior of transaction-stateful proxies to
* not forward stray INVITE responses. When receiving any SIP response,
* a transaction-stateful proxy MUST compare the transaction identifier
* in that response against its existing transaction state machines.
* The proxy MUST NOT forward the response if there is no matching
* transaction state machine.
*/
}
else
{
/* This method is called when stateless proxy gets response.
*/
/* RFC 3261 16.11.
* When a response arrives at a stateless proxy, the proxy MUST inspect the sent-by
* value in the first (topmost) Via header field value. If that address matches the proxy,
* (it equals a value this proxy has inserted into previous requests) the proxy MUST
* remove that header field value from the response and forward the result to the
* location indicated in the next Via header field value.
*/
// Just remove topmost Via:, sent-by check is done in transport layer.
e.Response.Via.RemoveTopMostValue();
if ((m_ProxyMode & SIP_ProxyMode.Statefull) != 0)
{
// We should not reach here. This happens when no matching client transaction found.
// RFC 3161 18.1.2 orders to forward them statelessly.
m_pStack.TransportLayer.SendResponse(e.Response);
}
else if ((m_ProxyMode & SIP_ProxyMode.Stateless) != 0)
{
m_pStack.TransportLayer.SendResponse(e.Response);
}
}
}