219 lines
6.6 KiB
Plaintext
219 lines
6.6 KiB
Plaintext
module BSC_MS_ConnectionHandler {
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/* (C) 2017-2019 Harald Welte <laforge@gnumonks.org>
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* All rights reserved.
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*
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* Released under the terms of GNU General Public License, Version 2 or
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* (at your option) any later version.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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import from General_Types all;
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import from Osmocom_Types all;
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import from SCCPasp_Types all;
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import from BSSAP_Types all;
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import from BSSAP_CodecPort all;
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import from RAN_Emulation all;
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import from BSSMAP_Templates all;
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import from MobileL3_Types all;
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import from MobileL3_CommonIE_Types all;
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import from L3_Templates all;
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import from MGCP_Types all;
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import from MGCP_Templates all;
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import from SDP_Types all;
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type function void_fn_bsc_ms(charstring id) runs on BSC_MS_ConnHdlr;
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/* this component represents a single subscriber connection at the MSC.
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* There is a 1:1 mapping between SCCP connections and RAN_ConnHdlr components.
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* We inherit all component variables, ports, functions, ... from RAN_ConnHdlr */
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type component BSC_MS_ConnHdlr extends RAN_ConnHdlr {
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/* SCCP Connecction Identifier for the underlying SCCP connection */
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var integer g_sccp_conn_id;
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var MgcpConnectionId g_mgcp_conn_id;
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var SDP_Message g_sdp;
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var BSC_State g_state;
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var BSC_MS_TestHdlrParams g_pars;
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}
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type record BSC_MS_TestHdlrParams {
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SCCP_PAR_Address sccp_addr_own,
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SCCP_PAR_Address sccp_addr_remote,
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boolean use_osmux
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};
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/* Callback function from general RAN_Emulation whenever a new incoming
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* SCCP connection arrivces. Must create + start a new component */
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private function CreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id)
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runs on RAN_Emulation_CT return RAN_ConnHdlr {
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log("Incoming SCCP Connection on BSC ?!?");
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self.stop;
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}
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/* Callback function from general RAN_Emulation whenever a connectionless
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* BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */
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private function UnitdataCallback(PDU_BSSAP bssap)
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runs on RAN_Emulation_CT return template PDU_BSSAP {
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var template PDU_BSSAP resp := omit;
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if (match(bssap, tr_BSSMAP_Reset)) {
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resp := ts_BSSMAP_ResetAck;
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}
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return resp;
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}
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const RanOps BSC_MS_RanOps := {
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create_cb := refers(CreateCallback),
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unitdata_cb := refers(UnitdataCallback),
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decode_dtap := false,
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role_ms := true,
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protocol := RAN_PROTOCOL_BSSAP,
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transport := BSSAP_TRANSPORT_AoIP,
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use_osmux := false,
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bssap_reset_retries := 1,
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sccp_addr_local := omit,
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sccp_addr_peer := omit
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}
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function f_gen_cl3(hexstring imsi) return PDU_BSSAP {
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var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi));
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var PDU_ML3_MS_NW l3 := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, mi));
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var BSSMAP_IE_CellIdentifier cell_id := valueof(ts_CellID_LAC_CI(23, 42));
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var PDU_BSSAP bssap := valueof(ts_BSSMAP_ComplL3(cell_id, enc_PDU_ML3_MS_NW(l3)));
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return bssap;
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}
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type enumerated BSC_State {
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BSC_STATE_NONE,
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BSC_STATE_WAIT_ASS_REQ,
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BSC_STATE_WAIT_CRCX,
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BSC_STATE_WAIT_MDCX,
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BSC_STATE_WAIT_MDCX2,
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BSC_STATE_WAIT_CLEAR_CMD,
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BSC_STATE_WAIT_DLCX,
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BSC_STATE_WAIT_DISC_IND
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}
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/* main function processing various incoming events */
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function bsc_ms_establish_fully(charstring id)
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runs on BSC_MS_ConnHdlr {
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var PDU_BSSAP bssap;
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var MgcpCommand mgcp_cmd;
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var template MgcpResponse mgcp_resp;
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var MgcpOsmuxCID osmux_cid;
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log("Starting main of BSC_MS_ConnHdlr");
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g_mgcp_conn_id := f_mgcp_alloc_conn_id();
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/* generate and send the Complete Layer3 Info */
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bssap := f_gen_cl3('901770123456789'H);
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var BSSAP_Conn_Req creq := {
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addr_peer := g_pars.sccp_addr_remote,
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addr_own := g_pars.sccp_addr_own,
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bssap := bssap
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}
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g_state := BSC_STATE_WAIT_ASS_REQ;
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BSSAP.send(creq);
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while (true) {
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alt {
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/* new SCCP-level connection indication from BSC */
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[g_state == BSC_STATE_WAIT_ASS_REQ] BSSAP.receive(tr_BSSMAP_AssignmentReq) -> value bssap {
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/* FIXME: Read CIC */
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/* respond with ASSIGNMENT COMPL */
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g_state := BSC_STATE_WAIT_CRCX;
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BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode));
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}
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/* CRCX -> OK */
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[g_state == BSC_STATE_WAIT_CRCX] BSSAP.receive(tr_CRCX) -> value mgcp_cmd {
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/* FIXME: proper SDP parameters */
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g_sdp := valueof(ts_SDP("127.0.0.1", "127.0.0.1", "foo", "21", 1000, { "98" },
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{ valueof(ts_SDP_rtpmap(98, "AMR/8000")),
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valueof(ts_SDP_ptime(20)) }));
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/* respond with CRCX_ACK */
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g_state := BSC_STATE_WAIT_MDCX;
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if (g_pars.use_osmux != f_MgcpCmd_contains_par(mgcp_cmd, "X-OSMUX")) {
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setverdict(fail, log2str("Received Osmux CID presence doesn't match presence expectancy (", g_pars.use_osmux, ")"));
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self.stop;
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}
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if (g_pars.use_osmux) {
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osmux_cid := f_MgcpCmd_extract_osmux_cid(mgcp_cmd);
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mgcp_resp := ts_CRCX_ACK_osmux(mgcp_cmd.line.trans_id, g_mgcp_conn_id, osmux_cid, g_sdp);
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} else {
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mgcp_resp := ts_CRCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp);
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}
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BSSAP.send(valueof(mgcp_resp));
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}
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/* MDCX -> OK */
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[g_state == BSC_STATE_WAIT_MDCX] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
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/* FIXME: verify if local part of endpoint name matches CIC */
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/* respond with MDCX_ACK */
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g_state := BSC_STATE_WAIT_MDCX2;
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BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
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}
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/* MDCX -> OK */
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[g_state == BSC_STATE_WAIT_MDCX2] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
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/* FIXME: verify if local part of endpoint name matches CIC */
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/* respond with MDCX_ACK */
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g_state := BSC_STATE_WAIT_CLEAR_CMD;
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BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
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}
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/* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */
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[g_state == BSC_STATE_WAIT_CLEAR_CMD] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap {
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g_state := BSC_STATE_WAIT_DLCX;
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BSSAP.send(ts_BSSMAP_ClearComplete);
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}
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/* DLCX -> OK */
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[g_state == BSC_STATE_WAIT_DLCX] BSSAP.receive(tr_DLCX) -> value mgcp_cmd {
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/* FIXME: verify if local part of endpoint name matches CIC */
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g_state := BSC_STATE_WAIT_DISC_IND;
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BSSAP.send(ts_DLCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id));
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}
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[] BSSAP.receive(tr_BSSAP_DTAP) -> value bssap {
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/* FIXME: verify if local part of endpoint name matches CIC */
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var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(bssap.pdu.dtap);
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log("Unhandled DTAP ", l3);
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}
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[g_state == BSC_STATE_WAIT_DISC_IND] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
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setverdict(pass);
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self.stop;
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}
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[] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND) {
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}
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/* disconnect in invalid state */
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[] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
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setverdict(fail);
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self.stop;
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}
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[] BSSAP.receive(PDU_BSSAP:?) -> value bssap {
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log("Received unhandled SCCP-CO: ", bssap);
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}
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}
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}
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}
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function bsc_ms_do_nothing(charstring id)
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runs on BSC_MS_ConnHdlr {
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}
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}
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