[Serusers] unwanted ACK forward

[tzieleniewski]

Hi All!

I was trying to write some test under sipp to test ser.
My scenario was the following:
         UA1         SIPProxy          UA2
          |INVITE        |              |
          |------------->|              |
          |407           |              |
          |<-------------|              |
          |ACK           |              |
          |------------->|              |
          |INVITE        |              |
          |------------->|              |
          |TRYING        |              |
          |<-------------|              |
          |              |INVITE        |
          |              |------------->|
          |              |OK            |
          |              |<-------------|
          |OK            |              |
          |<-------------|              |
          |ACK           |              |
          |------------->|              |
          |              |ACK           |
          |              |------------->|
I have no idea why in case of sipp emulation ser forward the first ACK to the UAS wich is in my case x-lite under linux. ser ip is 192.168.0.74:)

The ngrep from ser port is as follows:
#
U 2006/12/19 13:29:24.976872 192.168.0.138:5060 -> 192.168.0.74:5060
INVITE sip:tzl at scscf.ims.touk.pl SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.138:5061;branch=z9hG4bK-6204-1-0;rport.
Route: <sip:scscf.ims.touk.pl;lr>.
Max-Forwards: 70.
Contact: <sip:sippclient at 192.168.0.138:5061>.
To: "tzl"<sip:tzl at scscf.ims.touk.pl>.
From: "sippclient"<sip:sippclient at scscf.ims.touk.pl>;tag=1.
Call-ID: 1-6204 at 127.0.0.1.
CSeq: 1 INVITE.
Subject: Performance Test.
Content-Type: application/sdp.
Content-Length:  133.
.
v=0.
o=user1 53655765 2353687637 IN IP4 192.168.0.138.
s=-.
t=0 0.
c=IN IP4 127.0.0.1.
m=audio 6000 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.

#
U 2006/12/19 13:29:24.977525 192.168.0.74:5060 -> 192.168.0.138:5060
SIP/2.0 407 Proxy Authentication Required.
Via: SIP/2.0/UDP 192.168.0.138:5061;branch=z9hG4bK-6204-1-0;rport=5060.
To: "tzl"<sip:tzl at scscf.ims.touk.pl>;tag=9463a2e9cf4445c72e97ac31aeb7f1ed.a61b.
From: "sippclient"<sip:sippclient at scscf.ims.touk.pl>;tag=1.
Call-ID: 1-6204 at 127.0.0.1.
CSeq: 1 INVITE.
Proxy-Authenticate: Digest realm="scscf.ims.touk.pl", nonce="4587ea6059d5f141fce33748a3560a1eb274d934".
Server: Sip EXpress router (0.9.7-pre1 (x86_64/linux)).
Content-Length: 0.
Warning: 392 scscf.ims.touk.pl:5060 "Noisy feedback tells:  pid=5453 req_src_ip=192.168.0.138 req_src_port=5060 in_uri=sip:tzl at scscf.ims.touk.pl out_uri=sip:tzl at scscf.ims.touk.pl via_cnt==1".
.

#
U 2006/12/19 13:29:24.986124 192.168.0.138:5060 -> 192.168.0.74:5060
ACK sip:tzl at scscf.ims.touk.pl SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.138:5061;branch=z9hG4bK-6204-1-4;rport.
To: "tzl"<sip:tzl at scscf.ims.touk.pl>;tag=9463a2e9cf4445c72e97ac31aeb7f1ed.a61b.
From: "sippclient"<sip:sippclient at scscf.ims.touk.pl>;tag=1.
Call-ID: 1-6204 at 127.0.0.1.
CSeq: 1 ACK.
Subject: Performance Test.
Content-Length: 0.
.

#
U 2006/12/19 13:29:24.986124 192.168.0.138:5060 -> 192.168.0.74:5060
ACK sip:tzl at scscf.ims.touk.pl SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.138:5061;branch=z9hG4bK-6204-1-4;rport.
To: "tzl"<sip:tzl at scscf.ims.touk.pl>;tag=9463a2e9cf4445c72e97ac31aeb7f1ed.a61b.
From: "sippclient"<sip:sippclient at scscf.ims.touk.pl>;tag=1.
Call-ID: 1-6204 at 127.0.0.1.
CSeq: 1 ACK.
Subject: Performance Test.
Content-Length: 0.
.

there is olso one thing more when I used x-lite instead of the sipp as uac ser did't forward the ACK.

Please help me with this one.
Bests tomek