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lynxis lazus has posted comments on this change by lynxis lazus. ( 
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/38396?usp=email )

Change subject: SGSN: BSSGP_ConnHdlr: GMM Service Request: optional expect an 
authentication
......................................................................


Patch Set 1:

(1 comment)

Patchset:

PS1:
> Ideally we'd not widen the test expectations but execute two different tests 
> by somehow triggering t […]
Ok, I see your point. But what behavior is our goal here?
Spec compliant or SGSN specific (which should be also spec compliant)?

The definitive correct behavior isn't such simple.
a) If no UMTS security context is available (ciphering & key sequence number != 
0x7), the network has to do an authentication.

b) If the UE has a valid UMTS context, the network can do a Security Command 
without doing a authentication. Doing an authentication anyways has the 
advantage of having new key material.



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