//---------------------------------------------------------------------
// B2BUA event handlers
// Implementation Note
// -------------------
//
// The basic idea here is to intercept and modify the initial dialog INVITE
// request and response messages for a dialog and modify these messages
// before the B2BUA passes them on to the other side of the dialog.
//
// At this point, this simply means determining whether the request is
// coming from Microsoft Speech Server (MSS) or from the SIP trunk.
// I'm hacking this decision now by assuming that any SIP traffic from
// the current subnet is from MSS and should be routed outwards up the
// SIP trunk and that any traffic sourced outside the subnet is from the
// SIP trunk and should be routed to MSS.
//
// The current implementation updates the INVITE's URI to reflect the
// updated routing. The B2BUA takes care of modifying the dialog related
// headers including the Call-ID and the To/From tags as well as munging
// the Contact headers for request and response messages.
private void OnInviteRequestReceived(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA receives a dialog initiating INVITE request
// from the initiating side of the dialog.
bool fromMSS;
fromMSS = Helper.InSameSubnet(localAddress, args.Request.RemoteEndpoint.Address, localSubnet);
fromMSS = localAddress.Equals(args.Request.RemoteEndpoint.Address); // $todo(jeff.lill) delete this
if (fromMSS)
{
args.Request.Uri = (string)settings.TrunkUri;
}
else
{
args.Request.Uri = (string)settings.SpeechServerUri;
}
}
private void OnServerResponseReceived(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA receives a response from the accepting side
// of the bridged dialog.
}
private void OnClientRequestReceived(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA receives a request from the initiating side
// of the bridged dialog.
}
private void OnSessionClosing(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA is in the process of closing a dialog/session.
}
private void OnSessionConfirmed(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA receives the confirming ACK request from
// the initiating side of the dialog.
}
private void OnInviteResponseReceived(object sender, SipB2BUAEventArgs <object> args)
{
// Called when the B2BUA receives a dialog initiating INVITE response
// from the accepting side of the dialog.
}