Hi
I'm running two instances of SIPp to interact with a B2BUA server, and
am getting an odd response from the SIPp server module.
My server sends this SUBSCRIBE (taken from a wireshark trace):
SUBSCRIBE sip:[EMAIL PROTECTED]:5071 SIP/2.0
Call-ID: [EMAIL PROTECTED]
CSeq: 1 SUBSCRIBE
From: <sip:[EMAIL PROTECTED]:5060>;tag=-608704382
To: <sip:[EMAIL PROTECTED]:5071>
Via: SIP/2.0/UDP
127.0.0.1:5080;handler=SignalServlet;appname=SignalServlet;branch=z9hG4bK8843040021944fcc8abab51066d03b69
Max-Forwards: 70
Content-Type: text/plain
Record-Route:
<sip:127.0.0.1:5080;handler=SignalServlet;appname=SignalServlet;lr;transport=udp>
Contact: "mike" <sip:127.0.0.1:5080;transport=udp>
Content-Length: 0
to the SIPp server:, which uses the scenario below:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE scenario SYSTEM "sipp.dtd">
<scenario name="Basic Sipstone UAC">
<recv request="SUBSCRIBE" crlf='true'>
</recv>
<send>
<![CDATA[
NOTIFY [last_from] SIP/2.0
[last_Via:]
[last_From:]
[last_To:]
[last_Call-ID:]
[last_CSeq:]
Max-Forwards: 70
Expires: 18000
Subscription-State: active
Event: reg
Content-Length: [len]
<?xml version="1.0" encoding="UTF-8"?>
<impp:presence xmlns:impp="urn:ietf:params:xml:ns:pidf"
entity="pres:[EMAIL PROTECTED]">
<impp:tuple id="sg89ae">
<impp:status>
<impp:basic>open</impp:basic>
</impp:status>
<impp:contact priority="0.8">tel:+09012345678</impp:contact>
</impp:tuple>
</impp:presence>
]]>
</send>
<recv response="100" optional="true">
</recv>
<recv response="101" optional="true">
</recv>
<recv response="180" optional="true">
</recv>
<recv response="183" optional="true">
</recv>
<recv response="200">
</recv>
The response I get back from the SIPp server is a UDP message with title
"UDP CHECKSUM INCORRECT":
Frame 7 (794 bytes on wire, 794 bytes captured)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst:
00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
User Datagram Protocol, Src Port: 5071 (5071), Dst Port: 5080 (5080)
Source port: 5071 (5071)
Destination port: 5080 (5080)
Length: 760
Checksum: 0x010c [incorrect, should be 0x9f43 (maybe caused by "UDP
checksum offload"?)]
[Good Checksum: False]
[Bad Checksum: True]
Data (752 bytes)
This causes my server to reply with a 400 Bad Request message, and the
SIPp server does not execute. With wireshark checksum validation turned
on for UDP, all the messages in my scenarios get flagged for checksum
errors, but the logical entities carry on executing perfectly, until
such time as the SIPp server is messaged. Any ideas as to my problem?
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