[reSIProcate] Sip Responses being buffered. How do i get at them when they arrive?

[Robert Wyrobek]

Hi guys,

I've been using resiprocate for very basic purposes. I've been trying to 
avoid using any of the higher level functionality, and simply have an 
event loop which basically does this:

while (true) {

	sipStack->buildFdSet(fdset);

	sipStack->process(fdset);
	if ((SipMessage * msg=sipStack->receive())) {
		messageProcessor->onSipMessage(msg);
	}
	processOutgoingMessages(); // this simply reads off a list of 		
				   // SipMessage*s and sipStack(send)s 		
				   // each one of them.
}

This was all working fine when i was only answering sip requests, ie 
sending back responses to INVITEs using, for example, 
Helper::makeResponse(*origMsg,200,myAddress). The responses were being 
sent back as soon as I called sipStack->send(). Similarly, the INVITE 
was being passed to my messageProcessor->onSipMessage(msg) as soon as it 
arrived on the wire.

However, now I've been trying to send out INVITE requests. I'm sending 
out offerless invites created using 
Helper::makeInvite(targetAddress,myAddress), and then sent using 
sipStack->send(). The INVITE appears on the wire as soon as it is pushed 
into the sipStack, which is all great.

The problem is, that when the 200-OK comes back from the other end, it 
seems to be getting stuck in a fifo *somewhere*. I cannot for the life 
of me figure out where this is! The INVITE i've pushed into the stack 
gets resent 5 or 6 times, before the Timer B which is set to 32 seconds 
(again, i don't know where from) times out, and only then does the 
SipMessage get received by the sipStack->receive(msg) method.

I'm aware that SipStack::receive() is actually deprecated, but I've only 
been using that because I was copying the simple examples in 
resiprocate/resip/stack/test/*. I can see that this is something to do 
with a TransactionUser registering itself with the sipstack and 
associating itself with that INVITE request. But I don't know where this 
transaction user is being created, or how to get at its incoming queue...

Ideally, i'd like to (presumably) create my own subclass of 
TransactionUser which registers itself with the SipStack for ALL 
incoming requests AND responses, and just deal with all of the state of 
the dialogs myself. But for now I could just do with being told when a 
message arrives on the wire! There seems to be pretty much no 
documentation that I can find which tells me how I might do this, so any 
pointers would be very helpful.

I've been trying to figure this one out for almost a day now, and I 
figured it's about time to ask around. Can anyone help me out?

Thanks in advance, and sorry for the length of the email!

Rob

-- 
Robert Wyrobek <robert at mxtelecom.com>
Software Developer
Tel: +44 (0) 845 666 7778
Fax: +44 (0) 870 163 4694
http://www.mxtelecom.com