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Harald Welte laforge at gnumonks.orgDear Neels and others, I was confused earlier today. N-CONNECT is a primitive for a connection oriented SCCP-layer connection. You receive it at each time a UE establishes a connection-oriented SCCP for signalling, and it is what carrie RANAP InitialUE and related messages. What you are talking about for the RANAP Reset is the establishment of a signalling link (underneath SCCP/SUA), so something like the SCTP connection being established and released underneath. In the SUA RFC 3868 there are: * M-SCTP_ESTABLISH confirm ASP confirms to LM that it has established an SCTP association with its peer * M-SCTP_ESTABLISH indication SUA informs LM that a remote ASP has established an SCTP association. "LM" is the "Layer Manager". This is not the SCCP user, so no luck here. However, Q.711 / Q.714 contain a N-STATE.indication, which can be sent to a local SCCP user to inform it about the subsystem status. FRrom 5.3.6.2: "The local broadcast procedure provides a mechanism to inform local allowed concerned subsystems of any related SCCP/subsystem/signalling point status information received. [...] SCCP management then informs local allowed concerned SCCP subsystems about the subsystem status by invoking N-STATE indication primitive with "User-out-of-service" information." So once we loose the signalling link, all SCCP users should receive N-STATE.ind with "User-out-of-service". When the signalling link is (re-)established, all SCCP users should receive N-STATE.ind with "User-in-service". This should then be the trigger to send a N-UNITDATA.req() with a RANAP Reset inside. Regards, Harald -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)