[SIPForum-discussion] SIP Proxy Testing: INVITE server transaction

[Eugene Mednikov]

Greetings!
 
    I'm working on SIP Proxy testing according to ETSI TS 102 027 test
suite. There are several test cases that test INVITE server transaction. For
example test case SIP_CC_PR_TR_SE_V_006 description is: "Ensure that the IUT
in a server INVITE Proceeding state, on receipt of  an INVITE request,
including a Via header set with the same branch parameter and  sent-by value
in the topmost list value, repeats its last response." Reference: 17.2.1
[1], 17.2.3 [1].
    Basically this test connects to proxy as 2 telephones and sends 2
INVITEs from first phone to second phone one after another and checks that
response is the same. As I see response is 100 Trying. Problem arises when
authorization is enabled: how to work with CSeq counter?
 
    Without authorization message flow is simple:
---------------->        INVITE CSeq 3  (first invite)
<----------------        100 CSeq 3
---------------->        INVITE CSeq 3  (second invite)
<----------------        100 CSeq 3
 
    With authorization message flow is more complex:
 
Tester    Proxy
---------------->        INVITE CSeq 3  (first invite)
<----------------        407 CSeq 3
---------------->        INVITE CSeq 4
<----------------        100 CSeq 4
 
---------------->        INVITE CSeq N  (second invite)
<----------------        407 CSeq N
---------------->        INVITE CSeq N + 1
<----------------        100 CSeq N + 1
 
Now there is the question: what N should be: 3, 4, 5?

 
Respectfully yours, Eugene Mednikov.
 
Software Engineer
Hermon Labs
972-4-6288001, 207
972-54-4520187
em at hermonlabs.com <blocked::mailto:em at hermonlabs.com> 
www.hermonlabs.com <blocked::http://www.hermonlabs.com> 
 
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