/// <summary>
/// Processes specified request through this dialog.
/// </summary>
/// <param name="e">Method arguments.</param>
/// <returns>Returns true if this dialog processed specified request, otherwise false.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>e</b> is null reference.</exception>
protected internal override bool ProcessRequest(SIP_RequestReceivedEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
if (base.ProcessRequest(e))
{
return true;
}
// We must support: INVITE(re-invite),UPDATE,ACK, [BYE will be handled by base class]
#region INVITE
if (e.Request.RequestLine.Method == SIP_Methods.INVITE)
{
/* RFC 3261 14.2.
A UAS that receives a second INVITE before it sends the final
response to a first INVITE with a lower CSeq sequence number on the
same dialog MUST return a 500 (Server Internal Error) response to the
second INVITE and MUST include a Retry-After header field with a
randomly chosen value of between 0 and 10 seconds.
A UAS that receives an INVITE on a dialog while an INVITE it had sent
on that dialog is in progress MUST return a 491 (Request Pending)
response to the received INVITE.
*/
if (m_pActiveInvite != null && m_pActiveInvite is SIP_ServerTransaction &&
(m_pActiveInvite).Request.CSeq.SequenceNumber < e.Request.CSeq.SequenceNumber)
{
SIP_Response response =
Stack.CreateResponse(
SIP_ResponseCodes.x500_Server_Internal_Error +
": INVITE with a lower CSeq is pending(RFC 3261 14.2).",
e.Request);
response.RetryAfter = new SIP_t_RetryAfter("10");
e.ServerTransaction.SendResponse(response);
return true;
}
if (m_pActiveInvite != null && m_pActiveInvite is SIP_ClientTransaction)
{
e.ServerTransaction.SendResponse(
Stack.CreateResponse(SIP_ResponseCodes.x491_Request_Pending, e.Request));
return true;
}
// Force server transaction creation and set it as active INVITE transaction.
m_pActiveInvite = e.ServerTransaction;
m_pActiveInvite.StateChanged += delegate
{
if (m_pActiveInvite.State ==
SIP_TransactionState.Terminated)
{
m_pActiveInvite = null;
}
};
// Once we send 2xx response, we need to retransmit it while get ACK or timeout. (RFC 3261 13.3.1.4.)
((SIP_ServerTransaction) m_pActiveInvite).ResponseSent +=
delegate(object s, SIP_ResponseSentEventArgs a)
{
if (a.Response.StatusCodeType == SIP_StatusCodeType.Success)
{
m_pUasInvite2xxRetransmits.Add(new UasInvite2xxRetransmit(this, a.Response));
}
};
OnReinvite(((SIP_ServerTransaction) m_pActiveInvite));
return true;
}
#endregion
#region ACK
else if (e.Request.RequestLine.Method == SIP_Methods.ACK)
{
// Search corresponding INVITE 2xx retransmit entry and dispose it.
foreach (UasInvite2xxRetransmit t in m_pUasInvite2xxRetransmits)
{
if (t.MatchAck(e.Request))
{
t.Dispose();
if (State == SIP_DialogState.Early)
{
SetState(SIP_DialogState.Confirmed, true);
// TODO: If Terminating
}
return true;
}
}
return false;
}
#endregion
#region UPDATE
//else if(request.RequestLine.Method == SIP_Methods.UPDATE){
// TODO:
//}
#endregion
// RFC 5057 5.6. Refusing New Usages. Decline(603 Decline) new dialog usages.
else if (SIP_Utils.MethodCanEstablishDialog(e.Request.RequestLine.Method))
{
e.ServerTransaction.SendResponse(
Stack.CreateResponse(
SIP_ResponseCodes.x603_Decline + " : New dialog usages not allowed (RFC 5057).",
e.Request));
return true;
}
else
{
return false;
}
}
/// <summary>
/// Processes specified request through this dialog.
/// </summary>
/// <param name="e">Method arguments.</param>
/// <returns>Returns true if this dialog processed specified request, otherwise false.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>e</b> is null reference.</exception>
protected internal override bool ProcessRequest(SIP_RequestReceivedEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
if (base.ProcessRequest(e))
{
return(true);
}
// We must support: INVITE(re-invite),UPDATE,ACK, [BYE will be handled by base class]
#region INVITE
if (e.Request.RequestLine.Method == SIP_Methods.INVITE)
{
/* RFC 3261 14.2.
* A UAS that receives a second INVITE before it sends the final
* response to a first INVITE with a lower CSeq sequence number on the
* same dialog MUST return a 500 (Server Internal Error) response to the
* second INVITE and MUST include a Retry-After header field with a
* randomly chosen value of between 0 and 10 seconds.
*
* A UAS that receives an INVITE on a dialog while an INVITE it had sent
* on that dialog is in progress MUST return a 491 (Request Pending)
* response to the received INVITE.
*/
if (m_pActiveInvite != null && m_pActiveInvite is SIP_ServerTransaction &&
(m_pActiveInvite).Request.CSeq.SequenceNumber < e.Request.CSeq.SequenceNumber)
{
SIP_Response response =
Stack.CreateResponse(
SIP_ResponseCodes.x500_Server_Internal_Error +
": INVITE with a lower CSeq is pending(RFC 3261 14.2).",
e.Request);
response.RetryAfter = new SIP_t_RetryAfter("10");
e.ServerTransaction.SendResponse(response);
return(true);
}
if (m_pActiveInvite != null && m_pActiveInvite is SIP_ClientTransaction)
{
e.ServerTransaction.SendResponse(
Stack.CreateResponse(SIP_ResponseCodes.x491_Request_Pending, e.Request));
return(true);
}
// Force server transaction creation and set it as active INVITE transaction.
m_pActiveInvite = e.ServerTransaction;
m_pActiveInvite.StateChanged += delegate
{
if (m_pActiveInvite.State ==
SIP_TransactionState.Terminated)
{
m_pActiveInvite = null;
}
};
// Once we send 2xx response, we need to retransmit it while get ACK or timeout. (RFC 3261 13.3.1.4.)
((SIP_ServerTransaction)m_pActiveInvite).ResponseSent +=
delegate(object s, SIP_ResponseSentEventArgs a)
{
if (a.Response.StatusCodeType == SIP_StatusCodeType.Success)
{
m_pUasInvite2xxRetransmits.Add(new UasInvite2xxRetransmit(this, a.Response));
}
};
OnReinvite(((SIP_ServerTransaction)m_pActiveInvite));
return(true);
}
#endregion
#region ACK
else if (e.Request.RequestLine.Method == SIP_Methods.ACK)
{
// Search corresponding INVITE 2xx retransmit entry and dispose it.
foreach (UasInvite2xxRetransmit t in m_pUasInvite2xxRetransmits)
{
if (t.MatchAck(e.Request))
{
t.Dispose();
if (State == SIP_DialogState.Early)
{
SetState(SIP_DialogState.Confirmed, true);
// TODO: If Terminating
}
return(true);
}
}
return(false);
}
#endregion
#region UPDATE
//else if(request.RequestLine.Method == SIP_Methods.UPDATE){
// TODO:
//}
#endregion
// RFC 5057 5.6. Refusing New Usages. Decline(603 Decline) new dialog usages.
else if (SIP_Utils.MethodCanEstablishDialog(e.Request.RequestLine.Method))
{
e.ServerTransaction.SendResponse(
Stack.CreateResponse(
SIP_ResponseCodes.x603_Decline + " : New dialog usages not allowed (RFC 5057).",
e.Request));
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Raises <b>TerminatedByRemoteParty</b> event.
/// </summary>
/// <param name="bye">BYE request.</param>
private void OnTerminatedByRemoteParty(SIP_RequestReceivedEventArgs bye)
{
if (TerminatedByRemoteParty != null)
{
TerminatedByRemoteParty(this, bye);
}
}
/// <summary>
/// Raises <b>RequestReceived</b> event.
/// </summary>
/// <param name="e">Event data.</param>
internal void OnRequestReceived(SIP_RequestReceivedEventArgs e)
{
if (RequestReceived != null)
{
RequestReceived(this, e);
}
}
/// <summary>
/// Processes specified request through this dialog.
/// </summary>
/// <param name="e">Method arguments.</param>
/// <returns>Returns true if this dialog processed specified response, otherwise false.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>e</b> is null reference.</exception>
protected internal virtual bool ProcessRequest(SIP_RequestReceivedEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
if (e.Request.RequestLine.Method == SIP_Methods.BYE)
{
e.ServerTransaction.SendResponse(m_pStack.CreateResponse(SIP_ResponseCodes.x200_Ok, e.Request));
m_IsTerminatedByRemoteParty = true;
OnTerminatedByRemoteParty(e);
SetState(SIP_DialogState.Terminated, true);
return true;
}
return false;
}
