Hi list,
First off, here's my sipp -v output:
SIPp v3.1-TLS-PCAP, version unknown, built Feb 5 2010, 03:01:20.
I'm running a scenario where I use SIPp as a UAC. During the scenario,
the server sends back-to-back NOTIFY requests very quickly to SIPp. Each
of these NOTIFYs are part of separate transactions on an established
dialog. I have my scenario looking like the following:
<recv request="NOTIFY" crlf="true">
</recv>
<send retrans="500">
<![CDATA[
SIP/2.0 200 OK
[last_Via:]
[last_From:]
[last_To:]
[last_Call-ID:]
[last_CSeq:]
[last_Event:]
Contact: <sip:[local_ip]:[local_port];transport=[transport]>
Content-Length: 0
]]>
</send>
<recv request="NOTIFY" crlf="true">
</recv>
<send retrans="500">
<![CDATA[
SIP/2.0 200 OK
[last_Via:]
[last_From:]
[last_To:]
[last_Call-ID:]
[last_CSeq:]
[last_Event:]
Contact: <sip:[local_ip]:[local_port];transport=[transport]>
Content-Length: 0
]]>
</send>
Seems pretty simple. What happens though, is that SIPp sends the 200 OK
for the initial NOTIFY, receives the second NOTIFY, and then retransmits
the 200 OK for the initial NOTIFY until eventually the scenario fails.
Looking at the display while SIPp is running, I see that SIPp thinks
that it is actually transmitting (and retransmitting) the 200 OK for the
second NOTIFY and not the first. Packet inspection shows that the CSeq
and Via branches of the retransmitted 200 OK from SIPp match those of
the initial NOTIFY.
Since the NOTIFYs are sent by the server so quickly, I thought that
might be "confusing" SIPp. I altered my scenario to receive the NOTIFYs
back to back and then to try to send the two 200 OKs after. This meant
having to cache the Via and CSeq headers from the two NOTIFYs so they
could be echoed properly in the two 200 OKs that I sent. This, however,
resulted in the same behavior.
I skimmed the documentation for SIPp and could not find anything that
seemed relevant to my situation. I tried the wiki link from the SIPp
home page and got a 500 error. I also looked through the SIPp 3.2
changelog and did not see anything that sounded relevant to what I am doing.
If anyone can point me in the right direction for how to handle this
scenario, please let me know.
Thank you very much,
Mark Michelson
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