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lynxis lazus has posted comments on this change by lynxis lazus. ( 
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/39254?usp=email )

Change subject: SGSN: TC_attach_gmm_attach_req_while_gmm_attach: fix test case
......................................................................


Patch Set 2:

(2 comments)

File sgsn/SGSN_Tests.ttcn:

https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/39254/comment/e1e8d923_1d258a21?usp=email
 :
PS2, Line 2044:                         /* send out a second GMM_Attach Request.
> this comment no longer matches the code, you moved the second attach above... 
> […]
because the test case doesn't work this way anymore (or as soon libvlr is used).
I'll remove case


https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/39254/comment/c442672b_3f8e1551?usp=email
 :
PS2, Line 2050:                 [] as_gmm_auth(umts_aka_challenge := true, 
expect_sai := true) {};
> AFAIU the auth is exected to happen at the end of the whole alt? maybe simply 
> move it outside to exp […]
I don't see what's the problem.
The flow is something like this:
-> Attach Req (tmsi unknown)
<- Id Req
-> Id Resp
HLR: SAI
-> Attach Req (2nd)
The second Attach Req should be ignored by the SGSN, because it contains the 
same Attach Req.
<- Auth Req
-> Auth Resp
HLR: LU/ISD
<- Attach Accept
-> Attach Complete



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