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ada985a0ea
If LU has to be rejected because DGSM mechanism cannot reach the needed HLR, then returning reject cause #17 (Network Failure) is the most accurate and truthful description of what is actually happening. Reject cause #2 (IMSI unknown in HLR) is unlikely to be a good choice: in areas where regular commercial cell services are present alongside with experimental/adventurous Osmocom-based GSM networks, this reject cause is acutely dangerous as described in the previous commit, and even in areas where no regular commercial cell services are present (the presumed intended use case for DGSM), the behavior of commanding LU-failing phones "please don't ever again try to connect to ANY network until the user power-cycles you" is unlikely to be correct/desirable. If that behavior _is_ desired, it should be configured explicitly, not by default. Change-Id: I557ae1d3291066a87228b5db4f2e207ea721329c