Attach Reject Cause 111
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An expected reject cause on a network that has NO roaming agreement with Dtelekom would be "#15 “No suitable cells in tracking area”. And the device would continue the search for a suitable PLMN. So far, so good.
However, we sometimes see that an attach attempt on a such non-roaming network is rejected with this cause “#111: Protocol error, unspecified”.
Did anybody experience similar behaviour?