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{hscale=3}
moms = MS,BSS (MO)
momgw = MGW for MSC (MO)
momsc = MSC (MO)
sip = MNCC to PBX via
osmo-sip-connector
mtmsc = MSC (MT)
mtmgw = MGW for MSC (MT)
mtms = hNodeB,UE (MT)
moms > momsc CC Setup
Bearer Cap
momsc [] . CC starts guard timer (180s)
momsc <> . CC state:
INITIATED
callref = 0x80000001
momsc > sip MNCC_SETUP_IND
Bearer Cap: Speech Ver list
momsc < sip MNCC_RTP_CREATE
momgw < momsc for RAN: CRCX 1
rtpbridge/*@msc
momgw > momsc CRCX 1 OK
rtpbridge/0@msc, CI: ABCD1234, MGW RTP IP:port
moms < momsc Assignment Command
MGW RTP IP:port
moms > momsc Assignment Complete
Speech Codec (Chosen), BSC RTP IP:port
momgw < momsc for RAN: MDCX 2
rtpbridge/0@msc, CI: ABCD1234, codec (112="AMR/8000")
momgw > momsc MDCX 2 OK
momgw < momsc for CN: CRCX 3
rtpbridge/0@msc
momgw > momsc CRCX 3 OK
rtpbridge/0@msc, CI: BCDE2345, MGW RTP IP:port
momsc > sip MNCC_RTP_CREATE
MGW RTP IP:port, payload_type=112, payload_msg_type=GSM_TCH_FRAME_AMR
momsc < sip MNCC_CALL_PROC_REQ
momsc <> . CC state:
MO_CALL_PROC
moms < momsc DTAP: CC Call Proceeding
sip > mtmsc MNCC_SETUP_REQ
callref = 5002, called + calling MSISDN
mtmsc <> . CC state:
NULL
mtmsc > mtms Paging
mtmsc < mtms Paging Response
mtmsc [] . CC starts T303 (30s)
mtmsc <> . CC state:
CALL_PRESENT
mtmsc > mtms DTAP: CC Setup
mtmsc < mtms DTAP: CC Call Confirmed
Bearer Cap: Speech Ver list
mtmsc [] . CC stops T303
starts T310 (30s)
mtmsc <> . CC state:
MO_TERM_CALL_CONF
mtmgw < mtmsc for RAN: CRCX 4
rtpbridge/*@msc
sip < mtmsc MNCC_CALL_CONF_IND
Bearer Cap: Speech Ver list
sip > mtmsc MNCC_RTP_CREATE
mtmgw > mtmsc CRCX 4 OK
rtpbridge/1@msc, CI: CDEF3456, MGW RTP IP:port
mtmsc > mtms RAB Assignment Request
MGW RTP IP:port
mtmsc < mtms RAB Assignment Response
hNodeB RTP IP:port
mtmgw < mtmsc for RAN: MDCX 5
rtpbridge/1@msc, CI: CDEF3456, codec (112="AMR/8000")
mtmgw > mtmsc MDCX 5 OK
mtmgw < mtmsc for CN: CRCX 6
rtpbridge/1@msc
mtmgw > mtmsc CRCX 6 OK
CI: DEFA4567, MGW RTP IP:port
sip < mtmsc MNCC_RTP_CREATE
MGW RTP IP:port, payload_type=112, payload_msg_type=GSM_TCH_FRAME_AMR
mtmsc < mtms DTAP: CC Alerting
mtmsc [] . CC stops T310
starts T301 (180s)
mtmsc <> . CC state:
CALL_RECEIVED
sip < mtmsc MNCC_ALERT_IND
momsc < sip MNCC_ALERT_REQ
momsc [] . CC stops guard timer
momsc <> . CC state:
CALL_DELIVERED
moms < momsc DTAP: CC Alerting
...
... ringing
...
mtmsc < mtms DTAP: CC Connect
mtmsc [] . CC stops T301
mtmsc <> . CC state:
CONNECT_REQUEST
sip < mtmsc MNCC_SETUP_CNF
sip > mtmsc MNCC_RTP_CONNECT
SIP RTP IP:port
mtmgw < mtmsc for CN: MDCX 7
rtpbridge/1@msc, CI: DEFA4567, MGW RTP IP:port
sip > mtmsc MNCC_SETUP_COMPL_REQ
mtmsc [] . CC starts guard timer (180s)
mtmsc <> . CC state:
ACTIVE
mtmsc [] . CC stops guard timer
mtmsc > mtms DTAP: CC Connect Acknowledge
momsc < sip MNCC_RTP_CONNECT
SIP RTP IP:port
momgw < momsc for CN: MDCX 8
rtpbridge/0@msc, CI: BCDE2345, MGW RTP IP:port
mtmsc < mtmgw MDCX 7 OK
momsc < sip MNCC_SETUP_RSP
momsc [] . CC starts guard timer (180s)
also starts T313 (30s)
momsc <> . CC state:
CONNECT_IND
moms < momsc DTAP: CC Connect
momgw > momsc MDCX 8 OK
moms > momsc DTAP: CC Connect Acknowledge
momsc [] . CC stops T313
momsc <> . CC state:
ACTIVE
momsc [] . CC stops guard timer
momsc > sip MNCC_SETUP_COMPL_IND
...
... call ongoing
...
mtmsc < mtms DTAP: CC Disconnect
mtmsc <> . CC state:
DISCONNECT_IND
sip < mtmsc MNCC_DISC_IND
sip > mtmsc MNCC_REL_REQ
mtmsc [] . CC starts guard timer (180s)
and starts T308 (10s)
mtmsc > mtms DTAP: CC Release
momsc < sip MNCC_DISC_REQ
momsc [] . CC starts guard timer (180s)
and starts T306 (30s)
momsc <> . CC state:
DISCONNECT_IND
moms < momsc DTAP: CC Disconnect
moms > momsc DTAP: CC Release
momsc [] . CC stops T306
moms < momsc DTAP: CC Release Complete
momsc > sip MNCC_REL_IND
momsc <> . CC state:
NULL
momsc [] . CC frees transaction
stops guard timer
momgw < momsc for CN: DLCX
momgw < momsc for RAN: DLCX
moms < momsc Clear Command
moms > momsc Clear Complete
mtmsc < mtms DTAP: CC Release Complete
mtmsc [] . CC stops timer T308
sip < mtmsc MNCC_REL_CNF
mtmsc [] . CC frees transaction
stops guard timer
mtmgw < mtmsc for CN: DLCX
mtmgw < mtmsc for RAN: DLCX
mtms < mtmsc Iu Release Command
mtms > mtmsc Iu Release Command: Successful Outcome
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