239 lines
9.6 KiB
Plaintext
239 lines
9.6 KiB
Plaintext
msc {
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hscale=2;
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ms [label="MS/BTS"], ts [label="BSC timeslot FSM"],
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lchan[label="BSC lchan FSM"], rtp[label="BSC lchan RTP FSM"],mgwep[label="BSC MGW endpoint FSM"];
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ms box mgwep [label="lchan allocation sequence"];
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lchan abox lchan [label="LCHAN_ST_UNUSED"];
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...;
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lchan rbox lchan [label="lchan_activate(activate_info)"];
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lchan note lchan [label="Dispatching event to make sure the lchan FSM permits activation."];
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lchan -> lchan [label="LCHAN_EV_ACTIVATE\ndata = activate_info"];
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lchan abox lchan [label="LCHAN_ST_\nWAIT_TS_READY"];
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ts <- lchan [label="TS_EV_LCHAN_REQUESTED"];
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ts rbox ts [label="Most details omitted. See timeslot FSM diagrams."];
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ts note ts [label="A dyn TS may be in PDCH mode and will asynchronously switch off PDCH first. A
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non-dynamic TS is ready immediately."];
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|||;
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--- [label="IF requires_rtp_stream"];
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lchan -> rtp [label="lchan_rtp_fsm_start()"];
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rtp abox rtp [label="allocate\n LCHAN_RTP_ST_\nWAIT_MGW_ENDPOINT_\nAVAILABLE"];
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--- [label="IF no endpoint-CI yet"];
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rtp box rtp [label="gscon_ensure_mgw_endpoint()"];
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rtp -> mgwep [label="mgw_endpoint_ci_add(to-BTS)"];
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rtp -> mgwep [label="CRCX to-BTS"];
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mgwep rbox mgwep [label="MGCP: CRCX"];
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...;
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mgwep rbox mgwep [label="MGCP: CRCX OK"];
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rtp <- mgwep [label="LCHAN_RTP_EV_MGW_ENDPOINT_AVAILABLE"];
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rtp note mgwep [label="The CRCX OK has assigned us a new endpoint CI number"];
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rtp abox rtp [label="LCHAN_RTP_ST_WAIT_LCHAN_READY"];
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--- [label="END: no endpoint-CI yet"];
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--- [label="END: requires_rtp_stream"];
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|||;
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...;
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ts -> lchan [label="LCHAN_EV_TS_READY"];
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lchan abox lchan [label="LCHAN_ST_\nWAIT_ACTIV_ACK"];
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--- [label="IF ACTIVATE_FOR_MS_CHANNEL_REQUEST"];
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ms <= lchan [label="RSL Chan Activ (RSL_ACT_INTRA_IMM_ASS)"];
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--- [label="ELSE: ACTIVATE_FOR_ASSIGNMENT"];
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ms <= lchan [label="RSL Chan Activ (RSL_ACT_INTRA_NORM_ASS)"];
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--- [label="ELSE: ACTIVATE_FOR_HANDOVER"];
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ms <= lchan [label="RSL Chan Activ (RSL_ACT_INTER_ASYNC)"];
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--- [label="END"];
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...;
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ms rbox lchan [label="On timeout or Chan Activ NACK, see: 'On any error', 'unrecoverable'"];
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...;
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ms => lchan [label="RSL Chan Activ ACK"];
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lchan box lchan [label="lchan_fsm_post_activ_ack()"];
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--- [label="IF ACTIVATE_FOR_MS_CHANNEL_REQUEST"];
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ms <= lchan [label="RR Immediate Assignment"];
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--- [label="ELSE: ACTIVATE_FOR_ASSIGNMENT"];
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lchan rbox lchan [label="dispatch\nASSIGNMENT_EV_\nLCHAN_ACTIVE\n(see Assignment FSM diagrams)"];
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ms <= lchan [label="RR Assignment Command"];
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--- [label="ELSE: ACTIVATE_FOR_HANDOVER"];
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lchan rbox lchan [label="dispatch\nHO_EV_LCHAN_ACTIVE\n(see Handover FSM diagrams)"];
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--- [label="END"];
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lchan abox lchan [label="LCHAN_ST_WAIT_\nRLL_RTP_ESTABLISH\nT3101"];
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|||;
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|||;
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--- [label="IF requires_rtp_stream"];
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lchan -> rtp [label="LCHAN_RTP_EV_LCHAN_READY"];
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|||;
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--- [label="IF ip.access style BTS"];
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rtp abox rtp [label="LCHAN_RTP_ST_WAIT_IPACC_CRCX_ACK"];
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ms <= rtp [label="IPACC CRCX"];
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...;
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ms => rtp [label="IPACC CRCX ACK (BTS RTP port info)"];
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--- [label="END ip.access style BTS"];
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|||;
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rtp box rtp [label="lchan_rtp_fsm_switch_rtp()"];
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|||;
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--- [label="IF wait_before_switching_rtp"];
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rtp note rtp [label="During Handover, wait for HO DETECT before redirecting an existing endpoint
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CI towards the new lchan."];
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rtp abox rtp [label="LCHAN_RTP_ST_WAIT_READY_TO_SWITCH_RTP"];
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...;
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ms => rtp [label="HO DETECT (via Handover FSM)"];
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--- [label="END: wait_before_switching_rtp"];
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|||;
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rtp abox rtp [label="LCHAN_RTP_ST_WAIT_MGW_ENDPOINT_CONFIGURED"];
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rtp box rtp [label="connect_mgw_endpoint_to_lchan()"];
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rtp -> mgwep [label="MDCX to-BTS"];
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mgwep rbox mgwep [label="MGCP: MDCX"];
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...;
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mgwep rbox mgwep [label="MGCP: MDCX OK"];
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rtp <- mgwep [label="LCHAN_RTP_EV_MGW_ENDPOINT_CONFIGURED"];
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--- [label="IF ip.access style BTS"];
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rtp abox rtp [label="LCHAN_RTP_ST_WAIT_IPACC_MDCX_ACK"];
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ms <= rtp [label="IPACC MDCX (MGW RTP port info)"];
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...;
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ms => rtp [label="IPACC MDCX ACK"];
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--- [label="END ip.access style BTS"];
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rtp abox rtp [label="LCHAN_RTP_ST_READY"];
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lchan <- rtp [label="LCHAN_EV_RTP_READY"];
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rtp note rtp [label="RTP FSM stays ready for Rollback until final establish event"];
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...;
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lchan -> rtp [label="LCHAN_RTP_EV_ESTABLISHED\nvia gscon_change_primary_lchan()"];
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rtp abox rtp [label="LCHAN_RTP_ST_\nESTABLISHED"];
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--- [label="END: requires_rtp_stream"];
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|||;
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|||;
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...;
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ms => lchan [label="RLL Establish Ind"];
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lchan abox lchan [label="LCHAN_ST_\nESTABLISHED"];
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lchan box lchan [label="lchan_on_fully_established()"];
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--- [label="IF ACTIVATE_FOR_MS_CHANNEL_REQUEST"];
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ms note lchan [label="No action required. The MS will have sent an L3 message in the RLL
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Establish Ind and is then free to dispatch DTAP."];
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--- [label="ELSE: ACTIVATE_FOR_ASSIGNMENT"];
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lchan rbox lchan [label="dispatch\nASSIGNMENT_EV_\nLCHAN_ESTABLISHED\n(see Assignment FSM diagrams)"];
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--- [label="ELSE: ACTIVATE_FOR_HANDOVER"];
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lchan rbox lchan [label="dispatch\nHO_EV_LCHAN_ESTABLISHED\n(see Handover FSM diagrams)"];
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--- [label="END"];
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...;
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--- [label="IF requires_rtp_stream"];
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lchan rbox lchan [label="Assignment or Handover FSM:"];
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lchan -> mgwep [label="CRCX/MDCX to-MSC"];
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...;
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lchan <- mgwep [label="OK"];
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lchan box lchan [label="gscon_change_primary_lchan()"];
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lchan -> rtp [label="LCHAN_RTP_EV_ESTABLISHED"];
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rtp abox rtp [label="LCHAN_RTP_ST_\nESTABLISHED"];
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rtp box rtp [label="Forget any Rollback info"];
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--- [label="END: requires_rtp_stream"];
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...;
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...;
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...;
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ms rbox mgwep [label="On Mode Modify (e.g. change a TCH lchan from signalling to voice)"];
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lchan abox lchan [label="LCHAN_ST_\nWAIT_RR_CHAN_\nMODE_MODIFY_ACK"];
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ms <= lchan [label="RR Chan Mode Modif"];
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...;
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ms => lchan [label="RR Chan Mode Modif Ack"];
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lchan abox lchan [label="LCHAN_ST_\nWAIT_RSL_CHAN_\nMODE_MODIFY_ACK"];
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ms <= lchan [label="RSL MT Mode Modify Req"];
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...;
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ms => lchan [label="RSL MT Mode Modify Ack"];
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--- [label="IF adding RTP stream"];
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lchan abox lchan [label="LCHAN_ST_WAIT_\nRLL_RTP_ESTABLISH\nT3101"];
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lchan rbox rtp [label="See above at 'LCHAN_RTP_EV_LCHAN_READY'"];
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--- [label="IF not adding RTP stream"];
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lchan abox lchan [label="LCHAN_ST_\nESTABLISHED"];
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--- [label="END: whether adding voice stream"];
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...;
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...;
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...;
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ms rbox mgwep [label="When the MS or BTS release the lchan"];
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lchan abox lchan [label="LCHAN_ST_\nESTABLISHED"];
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ms -> lchan [label="RLL Release Ind for SAPI=0"];
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lchan abox lchan [label="LCHAN_ST_WAIT_RLL_RTP_RELEASED"];
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lchan rbox lchan [label="Continue at 'common release' below"];
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...;
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...;
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ms rbox mgwep [label="When the BSC decides to release the lchan"];
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lchan box lchan [label="lchan_release()"];
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lchan abox lchan [label="LCHAN_ST_WAIT_RLL_RTP_RELEASED"];
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ms <= lchan [label="RR Release"];
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lchan rbox lchan [label="common release"];
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--- [label="IF RTP FSM present"];
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lchan -> rtp [label="LCHAN_RTP_EV_RELEASE"];
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--- [label="END: RTP FSM present"];
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ms <= lchan [label="RSL Deactivate SACCH"];
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ms <= lchan [label="RSL Release Request (Local End)",ID="for each SAPI except [0]"];
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lchan note lchan [label="for ms->nokia.no_loc_rel_cnf we do not expect Release Confirm
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messages and immediately mark all SAPIs as released"];
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...;
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lchan <- rtp [label="LCHAN_EV_RTP_RELEASED"];
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...;
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ms => lchan [label="RLL Release Confirm",ID="for each SAPI except [0]"];
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...;
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lchan box lchan [label="Stay in\nLCHAN_ST_WAIT_\nRLL_RTP_RELEASED\nuntil only SAPI[0] remains active"];
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lchan abox lchan [label="LCHAN_ST_WAIT_\nBEFORE_RF_RELEASE\nT3111"];
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...;
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lchan box lchan [label="T3111 expires"];
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lchan box lchan [label="lchan_fsm_pre_rf_release()"];
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lchan abox lchan [label="LCHAN_ST_WAIT_\nRF_RELEASE_ACK\nT3111"];
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ms <= lchan [label="RSL RF Channel Release"];
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...;
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lchan rbox lchan [label="On timeout, continue at: 'On any error', 'unrecoverable'"];
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...;
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ms => lchan [label="RSL RF Channel Release Ack"];
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|||;
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--- [label="IF release_in_error"];
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lchan abox lchan [label="LCHAN_ST_WAIT_\nAFTER_ERROR\n(timeout: T3111+2 s, X3111)"];
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...;
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lchan box lchan [label="timer expires"];
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--- [label="END: release_in_error"];
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|||;
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lchan abox lchan [label="LCHAN_ST_UNUSED"];
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ts <- lchan [label="TS_EV_LCHAN_UNUSED"];
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|||;
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|||;
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|||;
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ms rbox mgwep [label="On any error"];
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|||;
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--- [label="IF ACTIVATE_FOR_MS_CHANNEL_REQUEST"];
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ms <= lchan [label="RR Immediate Assign Reject"];
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--- [label="ELSE: ACTIVATE_FOR_ASSIGNMENT"];
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lchan rbox lchan [label="dispatch\nASSIGNMENT_EV_\nLCHAN_ERROR\n(see Assignment FSM diagrams)"];
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--- [label="ELSE: ACTIVATE_FOR_HANDOVER"];
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lchan rbox lchan [label="dispatch\nHO_EV_LCHAN_ERROR\n(see Handover FSM diagrams)"];
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--- [label="END"];
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|||;
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--- [label="IF fi_rtp present"];
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lchan -> rtp [label="LCHAN_RTP_EV_ROLLBACK"];
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rtp rbox rtp [label="If to-BTS is not established yet, ROLLBACK is synonymous to LCHAN_RTP_EV_RELEASE"];
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rtp rbox rtp [label="If there is no old_lchan, just DLCX instead"];
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rtp abox rtp [label="LCHAN_RTP_ST_ROLLBACK"];
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rtp box rtp [label="connect_mgw_endpoint_to_lchan()\nusing old_lchan"];
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rtp -> mgwep [label="MDCX to-BTS"];
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mgwep rbox mgwep [label="MGCP: MDCX"];
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...;
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mgwep rbox mgwep [label="MGCP: MDCX OK"];
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rtp <- mgwep [label="LCHAN_RTP_EV_MGW_ENDPOINT_CONFIGURED"];
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rtp abox rtp [label="terminate"];
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lchan <- rtp [label="LCHAN_EV_RTP_RELEASED"];
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--- [label="END: fi_rtp present"];
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|||;
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|||;
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--- [label="IF unrecoverable error"];
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lchan abox lchan [label="LCHAN_ST_BORKEN"];
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ms note lchan [label="The broken state usually stays around
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until the BTS disconnects."];
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...;
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ms note lchan [label="If an ACK comes in late, for specific BTS models, we may choose to
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'repair' the lchan so that it is usable again."];
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ms -> lchan [label="RF Chan Release ACK"];
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lchan rbox lchan [label="continue above at\nLCHAN_ST_WAIT_\nAFTER_ERROR"];
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}
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