Hello,

looks like a broken routing logic somewhere. What addresses are assigned to your server? There are some exposed or masked in the trace you send, which of those are?

Cheers, Daniel

On 5/20/13 9:03 PM, Peter Dunkley wrote:

Hello,

The configuration is:

Jitsi #1 registered with sip2sip.info Jitsi #2 registered with my server(s) (Kamailio edge proxy and Kamailio registrar) on Amazon AWS running Kamailio from git master

I make a call from Jitsi #1 to Jitsi #2 (there are SRV records for my domain in Amazon Route 53 so that sip2sip.info can find my servers). The flow of the call is:

Jitsi #1 -> sip2sip.info -> Kamailio edge proxy -> Kamailio
registrar -> Kamailio edge proxy -> Jitsi #2

The calls do not get established properly because the ACK is not correctly routed. Calls between two Jitsi instances registered on my servers works. Calls from Jitsi #2 to Jitsi #1 (my servers to sip2sip.info) also work. This problem occurs whatever the value of the "enable_double_rr" modparam.

The 200 OK (INVITE) sent from my servers back to sip2sip.info looks OK and has a valid looking route-set:

SIP/2.0 200 OK
To:<sip:...callee...@...callee domain...>;tag=e5116094
Via: SIP/2.0/UDP 81.23.228.129:5060;rport=5060;branch=z9hG4bKdb93.87290485.0;i=0efbc,SIP/2.0/TLS 192.168.0.135:52379;rport=52379;received=a.b.c.d;branch=z9hG4bK-363631-23ca624fe9c119f229080992ed4fc143
Record-Route:<sip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@e.f.g.h:5061;transport=tls;r2=on;lr=on>,<sip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@10.244.155.159:5080;transport=tcp;r2=on;lr=on>,<sip:10.101.62.154;transport=tcp;lr=on>,<sip:10.244.155.159:5080;transport=tcp;r2=on;lr=on>,<sip:e.f.g.h;r2=on;lr=on>,<sip:81.23.228.129;r2=on;lr;ftag=2d246de3;did=989.4a20eb73>,<sip:81.23.228.129:5061;transport=tls;r2=on;lr;ftag=2d246de3;did=989.4a20eb73>
CSeq: 2 INVITE
Call-ID: 38135c0b82a8a7d571352350d207b943@0:0:0:0:0:0:0:0
From: "Caller"<sip:...caller...@sip2sip.info>;tag=2d246de3
Contact: "callee"<sip:...callee...@10.6.201.224:60847;transport=tls;registering_acc=...callee domain...>
User-Agent: Jitsi2.3.4622.9647Linux
Content-Type: application/sdp
Content-Length: 838

...lots of SDP...

The ACK from sip2sip.info to my servers looks OK too:

ACKsip:...callee...@174.129.184.181:5060;transport=tls;registering_acc=...callee  domain... SIP/2.0
Call-ID: 38135c0b82a8a7d571352350d207b943@0:0:0:0:0:0:0:0
CSeq: 2 ACK
Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bKdb93.87290485.2;i=0efbc
Via: SIP/2.0/TLS 192.168.0.135:52379;rport=52379;received=a.b.c.d;branch=z9hG4bK-363631-212696616e66a14286e3165485387895
From: "Caller"<sip:...caller...@sip2sip.info>;tag=2d246de3
To: "callee"<sip:...callee...@...callee domain...>;tag=e5116094
Max-Forwards: 69
Route: <sip:e.f.g.h;r2=on;lr=on>,<sip:10.244.155.159:5080;transport=tcp;r2=on;lr=on>,<sip:10.101.62.154;transport=tcp;lr=on>,<sip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@10.244.155.159:5080;transport=tcp;r2=on;lr=on>,<sip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@e.f.g.h:5061;transport=tls;r2=on;lr=on>
Contact: "Caller"<sip:...caller...@90.152.0.102:52379;transport=tls;registering_acc=sip2sip_info>
User-Agent: Jitsi2.2.4603.9615Windows 7
Content-Length: 0

But the ACK from from my edge proxy to my registrar looks very broken:

ACKsip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@e.f.g.h:5061;transport=tls;r2=on;lr=on  SIP/2.0
Call-ID: 38135c0b82a8a7d571352350d207b943@0:0:0:0:0:0:0:0
CSeq: 2 ACK
Via: SIP/2.0/TCP e.f.g.h:5060;branch=z9hG4bKdb93.444f42f24139f6dc512d70f61ca64be4.0
Via: SIP/2.0/UDP 81.23.228.129:5060;rport=5060;branch=z9hG4bKdb93.87290485.2;i=0efbc
Via: SIP/2.0/TLS 192.168.0.135:52379;rport=52379;received=a.b.c.d;branch=z9hG4bK-363631-212696616e66a14286e3165485387895
From: "Caller"<sip:...caller...@sip2sip.info>;tag=2d246de3
To: "callee"<sip:...callee...@...callee domain...>;tag=e5116094
Max-Forwards: 16
Route: <sip:10.244.155.159:5080;transport=tcp;r2=on;lr=on>,<sip:10.101.62.154;transport=tcp;lr=on>,<sip:Rlwj4KMCy9UUUAMK9JufE8VamABismk=@10.244.155.159:5080;transport=tcp;r2=on;lr=on>
Contact: "Caller"<sip:...caller...@a.b.c.d:52379;transport=tls;registering_acc=sip2sip_info>
User-Agent: Jitsi2.2.4603.9615Windows 7
Content-Length: 0

With debug turned up on the edge proxy I see the output from lines 673 and 723 indicating that the loose.c:after_strict() is run.

My edge proxy configuration is:

request_route {
	route(REQINIT);

	route(OPTIONS);

	sip_trace();
	setflag(F_SIPTRACE);

         if (is_method("CANCEL")) {
		if (t_check_trans()) {
			route(RELAY);
		}
		exit;
	}

	route(WITHINDLG);
	...


route[WITHINDLG] {
	if (has_totag()) {
		if (!loose_route()) {
			switch($rc) {
			case -2:
				send_reply("403", "Forbidden");
				exit;
			default:
				if (is_method("ACK")) {
					if ( t_check_trans() ) {
						route(RELAY);
						exit;
					} else {
						exit;
					}
				}
				send_reply("404","Not Found");
			}
		} else {
			if ($rc == 2) {
				setflag(F_OB_DRIVEN);
			}

			if (is_method("NOTIFY")) {
				record_route();
			}
			route(RELAY);
		}
		exit;
	}
}

Have I done something fundamentally stupid here, or is there some obscure bug in the loose/strict routing code?

Regards,

Peter

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