It helps in a pretty complex situation seen in the field. A third-party MSC releases SCCP in one fell swoop, not waiting for the Iu Release Complete to come back from RAN as the specs would suggest. The result is this odd sequence, where late rx of RUA Disconnect actually causes a new SCCP connection to be established and torn down again: RAN HNBGW MSC |--active-RUA-ctx----|--active-sccp------| | |<--IU-Release-Cmd--| |<--IU-Release-Cmd---| | | |<--SCCP-RLSD-------| (too soon) |...<-RUA-Disconnect-| x (the consequence) | x |--RUA-Disconnect--->| (IU Release Complete) x <create-new-ctx> |-SCCP-CR---------->| |-IU-Release-Compl->| |<--CREF------------| x x This patch is a relatively simple practical improvement of above situation that is logically obvious: Validate the correct message type for creating a new RUA-to-SCCP context: RUA Connect. That means the IU Release Complete is ignored: RAN HNBGW MSC |--active-RUA-ctx----|--active-sccp------| | |<--IU-Release-Cmd--| |<--IU-Release-Cmd---| | | |<--SCCP-RLSD-------| (too soon) |...<-RUA-Disconnect-| x (the consequence) | x |--RUA-Disconnect--->| (IU Release Complete) x <error> x Related: SYS#6602 Change-Id: Ie359fcada98fb19f56015cf462e6d8c039f5fce5 |
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Makefile.am |