288 lines
7.0 KiB
Plaintext
288 lines
7.0 KiB
Plaintext
module IPA_Emulation {
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import from IPA_Types all;
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import from IPA_CodecPort all;
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import from IPA_CodecPort_CtrlFunct all;
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import from IPL4asp_Types all;
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import from MTP3asp_Types all;
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import from MTP3asp_PortType all;
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import from MGCP_Types all;
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/*
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modulepar {
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}
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*/
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type enumerated IpaMode {
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IPA_MODE_CLIENT,
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IPA_MODE_SERVER
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}
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type record ASP_IPA_Unitdata {
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IpaStreamId streamId,
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IpaExtStreamId streamIdExt optional,
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octetstring payload
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}
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type port IPA_SP_PT message {
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inout ASP_IPA_Unitdata;
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} with { extension "internal" }
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type port IPA_MGCP_PT message {
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inout MgcpCommand, MgcpResponse;
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} with { extension "internal" }
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type component IPA_Emulation_CT {
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/* down-facing port to IPA codec port */
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port IPA_CODEC_PT IPA_PORT;
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/* up-facing port to SCCP */
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port MTP3asp_SP_PT MTP3_SP_PORT;
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/* up-facing port for MGCP */
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port IPA_MGCP_PT IPA_MGCP_PORT;
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/* up-facing port for other streams */
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port IPA_SP_PT IPA_SP_PORT;
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var boolean g_initialized := false;
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var ConnectionId g_ipa_conn_id := -1;
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/* Are we a BSC/MGW (truel) or MSC (false) */
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var boolean g_is_bsc_mgw;
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var IpaMode g_mode;
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}
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function f_connect(charstring remote_host, PortNumber remote_port,
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charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
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var Result res;
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res := IPA_CodecPort_CtrlFunct.f_IPL4_connect(IPA_PORT, remote_host, remote_port,
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local_host, local_port, 0, { tcp:={} });
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g_ipa_conn_id := res.connId;
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g_is_bsc_mgw := true;
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}
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function f_bind(charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
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var Result res;
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res := IPA_CodecPort_CtrlFunct.f_IPL4_listen(IPA_PORT,
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local_host, local_port, { tcp:={} });
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g_ipa_conn_id := res.connId;
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g_is_bsc_mgw := false;
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}
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template ASP_MTP3_TRANSFERind ts_MTP3_XFER_ind(integer opc, octetstring data) := {
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sio := { '10'B, '00'B, '0011'B },
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opc := opc,
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dpc := 0,
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sls := 0,
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data := data
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}
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private template IpaCcmRespPart t_IdRespPart(IpaCcmIdTag tag, charstring payload) := {
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len := 0, /* overwritten by codec */
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tag := tag,
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data := payload
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}
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/* build IPA CCM ID RESP response from IPA CCM GET */
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private function f_ccm_make_id_resp(PDU_IPA_CCM get) return PDU_IPA_CCM {
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var integer i;
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var PDU_IPA_CCM resp := {
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msg_type := IPAC_MSGT_ID_RESP,
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u := {
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resp := {}
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}
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}
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for (i := 0; i < sizeof(get.u.get); i := i + 1) {
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var IpaCcmIdTag tag := get.u.get[i].tag;
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var charstring foo;
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select (tag) {
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case (IPAC_IDTAG_UNIT) {
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foo := "0/1/2";
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}
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case (IPAC_IDTAG_UNITNAME) {
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foo := "mahlzeit";
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}
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case else {
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foo := "foo";
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}
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}
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resp.u.resp[sizeof(resp.u.resp)] := valueof(t_IdRespPart(tag, foo));
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}
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return resp;
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}
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/* transmit IPA CCM message */
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private function f_ccm_tx(PDU_IPA_CCM ccm) runs on IPA_Emulation_CT {
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var IPA_Send ipa_tx := valueof(t_IPA_Send(g_ipa_conn_id, IPAC_PROTO_CCM, enc_PDU_IPA_CCM(ccm)));
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log("CCM Tx:", ccm);
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IPA_PORT.send(ipa_tx);
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}
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template PDU_IPA_CCM ts_IPA_PONG := {
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msg_type := IPAC_MSGT_PONG,
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u := omit
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}
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template PDU_IPA_CCM ts_IPA_ACK := {
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msg_type := IPAC_MSGT_ID_ACK,
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u := omit
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}
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template PDU_IPA_CCM ts_IPA_ID_GET := {
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msg_type := IPAC_MSGT_ID_GET,
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u := {
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get := {
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{ 1, IPAC_IDTAG_UNITNAME }
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}
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}
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}
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/* receive IPA CCM message */
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private function f_ccm_rx(PDU_IPA_CCM ccm) runs on IPA_Emulation_CT {
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select (ccm.msg_type) {
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case (IPAC_MSGT_PING) {
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f_ccm_tx(valueof(ts_IPA_PONG));
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}
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case (IPAC_MSGT_ID_ACK) {
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f_ccm_tx(valueof(ts_IPA_ACK));
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}
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case (IPAC_MSGT_ID_GET) {
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f_ccm_tx(f_ccm_make_id_resp(ccm));
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}
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case else {
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log("Unknown/unsupported IPA CCM message type", ccm);
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}
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}
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}
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private function f_to_asp(IPA_RecvFrom ipa_rx) return ASP_IPA_Unitdata {
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var ASP_IPA_Unitdata ret := {
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streamId := ipa_rx.streamId,
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streamIdExt := ipa_rx.streamIdExt,
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payload := ipa_rx.msg
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}
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return ret;
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}
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private function f_from_asp(ConnectionId connId, ASP_IPA_Unitdata ipa_tx) return IPA_Send {
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var IPA_Send ret := valueof(t_IPA_Send(connId, ipa_tx.streamId, ipa_tx.payload,
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ipa_tx.streamIdExt));
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return ret;
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}
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function main_client(charstring remote_host, PortNumber remote_port,
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charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
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g_mode := IPA_MODE_CLIENT;
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f_connect(remote_host, remote_port, local_host, local_port);
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ScanEvents();
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}
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function main_server(charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
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g_mode := IPA_MODE_SERVER;
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f_bind(local_host, local_port);
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ScanEvents();
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}
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private function f_mgcp_to_user(octetstring msg) runs on IPA_Emulation_CT {
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var charstring msg_ch := oct2char(msg);
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if (g_is_bsc_mgw) {
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log("============");
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log(msg_ch);
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IPA_MGCP_PORT.send(dec_MgcpCommand(msg_ch));
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} else {
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IPA_MGCP_PORT.send(dec_MgcpResponse(msg_ch));
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}
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}
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private function ScanEvents() runs on IPA_Emulation_CT {
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var IPA_RecvFrom ipa_rx;
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var ASP_IPA_Unitdata ipa_ud;
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var ASP_MTP3_TRANSFERreq mtp_req;
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var ASP_Event asp_evt;
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var MgcpCommand mgcp_cmd;
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var MgcpResponse mgcp_rsp;
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while (true) {
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alt {
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/* Received IPA -> up into SCCP stack */
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[] IPA_PORT.receive(IPA_RecvFrom: ?) -> value ipa_rx {
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select (ipa_rx.streamId) {
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case (IPAC_PROTO_CCM) {
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var PDU_IPA_CCM ccm := dec_PDU_IPA_CCM(ipa_rx.msg);
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log("CCM Rx:", ccm);
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f_ccm_rx(ccm);
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} case (IPAC_PROTO_SCCP) {
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var ASP_MTP3_TRANSFERind mtp;
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mtp := valueof(ts_MTP3_XFER_ind(0, ipa_rx.msg));
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MTP3_SP_PORT.send(mtp);
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} case (IPAC_PROTO_MGCP_OLD) {
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f_mgcp_to_user(ipa_rx.msg);
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} case (IPAC_PROTO_OSMO) {
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select (ipa_rx.streamIdExt) {
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case (IPAC_PROTO_EXT_MGCP) {
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f_mgcp_to_user(ipa_rx.msg);
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} case else {
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IPA_SP_PORT.send(f_to_asp(ipa_rx));
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}
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}
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} case else {
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IPA_SP_PORT.send(f_to_asp(ipa_rx));
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}
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}
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}
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/* server only */
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[] IPA_PORT.receive(ASP_Event:{connOpened:=?}) -> value asp_evt {
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log("IPA: Connected");
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g_ipa_conn_id := asp_evt.connOpened.connId;
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if (g_mode == IPA_MODE_SERVER) {
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f_ccm_tx(valueof(ts_IPA_ID_GET));
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}
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}
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[] IPA_PORT.receive(ASP_Event:{connClosed:=?}) -> value asp_evt {
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log("IPA: Closed");
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g_ipa_conn_id := -1;
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self.stop;
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}
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/* Received SCCP -> down into IPA */
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[] MTP3_SP_PORT.receive(ASP_MTP3_TRANSFERreq: ?) -> value mtp_req {
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var IPA_Send ipa_tx := valueof(t_IPA_Send(g_ipa_conn_id, IPAC_PROTO_SCCP,
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mtp_req.data));
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IPA_PORT.send(ipa_tx);
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}
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/* Received MGCP -> down into IPA */
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[] IPA_MGCP_PORT.receive(MgcpCommand:?) -> value mgcp_cmd {
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ipa_ud := {
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streamId := IPAC_PROTO_OSMO,
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streamIdExt := IPAC_PROTO_EXT_MGCP,
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payload := char2oct(enc_MgcpCommand(mgcp_cmd))
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}
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IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
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}
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[] IPA_MGCP_PORT.receive(MgcpResponse:?) -> value mgcp_rsp {
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ipa_ud := {
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streamId := IPAC_PROTO_OSMO,
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streamIdExt := IPAC_PROTO_EXT_MGCP,
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payload := char2oct(enc_MgcpResponse(mgcp_rsp))
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}
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IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
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}
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/* Received MISC (RSL/OML/CTRL) -> down into IPA */
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[] IPA_SP_PORT.receive(ASP_IPA_Unitdata: ?) -> value ipa_ud {
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IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
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}
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}
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}
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}
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}
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