Davide,

I don't know why you are getting the unexpected messages, that is likely 
based on your OpenIMS configuration.

I have seen incorrect checksums when tracing SIP traffic with Wireshark; 
but they have never caused me problems.  SIPp isn't involved in the UDP 
checksumming, and my guess is that the kernel does not apply the 
checksumming algorithm at the time Wireshark sees the packet; or maybe it 
is offloaded to your Ethernet card.

Charles

[EMAIL PROTECTED] wrote on 03/07/2008 06:13:20 AM:

> Hi,
> 
> this is the my first topic.
> Now i have a problem. I have created a scenario of Session SIP on IMS 
> network.
> 
> I have installed OpenIMS on four virtual machine:
> 
>     * P-CSCF: 192.168.10.92
>     * I-CSCF:192.168.10.91
>     * S-CSCF: 192.168.10.93
>     * HSS:192.168.10.90
> 
> The realm is snodo.
> The REGISTER scenario runs correctly. After bob and alice register on 
> IMS network, i launch the Session scenario (uac.xml):
> <?xml version="1.0" encoding="ISO-8859-1" ?>
> <scenario name="Session Alice - Bob - Client Side">
> <send retrans="500">
>     <![CDATA[
> 
>       INVITE sip:[EMAIL PROTECTED] SIP/2.0
>       Via: SIP/2.0/UDP [local_ip]:[local_port];branch=[branch]
>       Route: <sip:[EMAIL PROTECTED]:6060;lr>
>       From: "alice" <sip:[EMAIL PROTECTED]>;tag=[call_number]
>       To:  <sip:[EMAIL PROTECTED]>
>       Call-ID: [call_id]
>       Cseq: [cseq] INVITE
>       Contact: <sip:[EMAIL PROTECTED]:[local_port]>
>       P-Preferred-Identity: "alice" <sip:[EMAIL PROTECTED]>
>       User-Agent: UCT IMS Client
>       Max-Forwards: 20
>       Subject: IMS Call
>       Content-Type: application/sdp
>       Content-Length: [len]
> 
>       v=0
>       o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
>       s=-
>       t=0 0
>       c=IN IP[media_ip_type] [media_ip]
>       m=audio [media_port] RTP/AVP 0
>       a=rtpmap:0 PCMU/8000
> 
> 
>     ]]>
> </send>
> 
> <recv response="100" crlf="true"> optional="true"
> </recv>
> 
> <recv response="180" crlf="true"> optional="true"
> </recv>
> 
> <recv response="200" crlf="true">
> </recv>
> 
> <send crlf="true" retrans="500">
>     <![CDATA[
> 
>       ACK sip:[EMAIL PROTECTED]:5061 SIP/2.0
>       Via: SIP/2.0/UDP 192.168.10.92:4060;
>       From: "Alice" <sip:[EMAIL PROTECTED]>;tag=[call_number]
>       To: "" <sip:[EMAIL PROTECTED]>;[peer_tag_param]
>       Route: <sip:[EMAIL PROTECTED]:4060;lr>
>       Route: <sip:[EMAIL PROTECTED]:6060;lr>
>       Route: <sip:[EMAIL PROTECTED]:6060;lr>
>       Route: <sip:[EMAIL PROTECTED]:4060;lr>
>       Call-ID: [call_id]
>       Cseq: [cseq] ACK
>       Contact: "alice" <sip:[EMAIL PROTECTED]:[local_port]>
>       Max-Forwards: 70
>       Subject: Performance Test
>       Content-Length: 0
> 
>     ]]>
>  </send>
> 
> <pause milliseconds="5000" crlf="true" />
> 
> <send retrans="500" crlf="true">
>      <![CDATA[
> 
>       BYE sip:[EMAIL PROTECTED]:[local_port] SIP/2.0
>       Via: SIP/2.0/UDP [local_ip]:[local_port];branch=[branch]
>       From: "Alice" <sip:[EMAIL PROTECTED]>;tag=[call_number]
>       To: "" <sip:[EMAIL PROTECTED]>;[peer_tag_param]
>       Route: 
> <sip:[EMAIL PROTECTED]:4060;lr>,<sip:[EMAIL PROTECTED]:6060;lr>,<sip:
> [EMAIL PROTECTED]:6060;lr>,<sip:[EMAIL PROTECTED]:4060;lr> 
> 
>       Call-ID: [call_id]
>       Cseq: 2 BYE
>       Max-Forwards: 70
>       Subject: Performance Test
>       Content-Length: 0
> 
>     ]]>
> </send>
> 
> <recv response="200" crlf="true">
> </recv>
> 
> </scenario>
> 
>  with the command:
> sipp -sf uac.xml 192.168.10.92:4060 -i 192.168.16.49 -p 5060 -m 100
> 
> The IP of Client is 192.168.16.49 and the IP of Server (uas) is 
> 192.168.10.80. On 192.168.10.80 i have launched the uas scenario.
> 
> The sipp result is:
> Resolving remote host '192.168.10.92'... Done.
> ------------------------------ Scenario Screen -------- [1-9]: Change 
> Screen --
>   Call-rate(length)     Port   Total-time  Total-calls  Remote-host
>   10.0(0 ms)/1.000s   5060      10.02 s          100 
> 192.168.10.92:4060(UDP)
> 
>   Call limit reached (-m 100), 0.009 s period  2 ms scheduler resolution
>   0 calls (limit 150)                    Peak was 1 calls, after 0 s
>   0 Running, 1 Paused, 0 Woken up
>   0 out-of-call msg (discarded)
>   1 open sockets
> 
>                                  Messages  Retrans   Timeout 
> Unexpected-Msg
>       INVITE ---------->         100       0         0
>          100 <----------         0         0                   100
> 
>          180 <----------         0         0                   0
> 
>          200 <----------         0         0                   0
> 
>          ACK ---------->         0         0         0
> 
>        Pause [   5000ms]         0                             0
> 
>          BYE ---------->         0         0         0
> 
>          200 <----------         0         0                   0
> 
> ------------------------------ Test Terminated 
> --------------------------------
> 
> 
> ----------------------------- Statistics Screen ------- [1-9]: Change 
> Screen --
>   Start Time             | 2008-03-07 11:29:26
>   Last Reset Time        | 2008-03-07 11:29:36
>   Current Time           | 2008-03-07 11:29:36
> -------------------------+---------------------------
> +--------------------------
>   Counter Name           | Periodic value            | Cumulative value
> -------------------------+---------------------------
> +--------------------------
>   Elapsed Time           | 00:00:00:009              | 00:00:10:025
>   Call Rate              |  111.111 cps              |    9.975 cps
> -------------------------+---------------------------
> +--------------------------
>   Incoming call created  |        0                  |        0
>   OutGoing call created  |        1                  |      100
>   Total Call created     |                           |      100
>   Current Call           |        0                  |
> -------------------------+---------------------------
> +--------------------------
>   Successful call        |        0                  |        0
>   Failed call            |        1                  |      100
> -------------------------+---------------------------
> +--------------------------
>   Call Length            | 00:00:00:009              | 00:00:00:004
> ------------------------------ Test Terminated 
> --------------------------------
> 
> 2008-03-07 11:29:36: Aborting call on unexpected message for Call-ID 
> '[EMAIL PROTECTED]': while expecting '100' response, received 
> 'SIP/2.0 403 Forbidden - You must register first with a S-CSCF
> Via: SIP/2.0/UDP 
192.168.16.49:5060;branch=z9hG4bK-27532-100-0;rport=5060
> From: "alice" <sip:[EMAIL PROTECTED]>;tag=100
> To:  <sip:[EMAIL PROTECTED]>;tag=f2976a7a54bbb7bdb2169461ed399020.8b3c
> Call-ID: [EMAIL PROTECTED]
> Cseq: 1 INVITE
> Server: Sip EXpress router (2.1.0-dev1 OpenIMSCore (i386/linux))
> Content-Length: 0
> Warning: 392 192.168.10.92:4060 "Noisy feedback tells:  pid=28151 
> req_src_ip=192.168.16.49 req_src_port=5060 in_uri=sip:[EMAIL PROTECTED] 
> out_uri=sip:[EMAIL PROTECTED] via_cnt==1"
> 
> ' .
> sipp: There were more errors, enable -trace_err to log them.
> 
> All INVITE messages result Unexpected Message.
> So I have used Wireshark to sniff the session and the error of INVITE 
> messages are:
> User Datagram Protocol, Src Port: sip (5060), Dst Port: 4060 (4060)
> Checksum: 0x9e45 [incorrect, should be 0x749a (maybe caused by "UDP 
> checksum offload"?)]
> Bad Checksum: True
> 
> I don't understand what is the problem. Have you a idea?
> 
> Thanks
> Davide
> 
> P.S. Excuse me, my english is very poor.
> 
> 
> 
> 
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