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osmo-gsm-manuals
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message sequence charts for GSM <-> SIP codec selection 

Those diagrams represent the current design of the way how
GSM <-> SIP codec selection should work in the future.

Related: OS#1683
Change-Id: If92379b41d859bdf7be4b7689dc0bbca7cb6e682
This commit is contained in:
Harald Welte 2018-03-26 23:02:26 +02:00
parent 51a87cec2c
commit d5b6a78b9f
3 changed files with 211 additions and 0 deletions
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68
common/chapters/msc_mncc_mo_sip_mgcp.msc Normal file
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msc {
hscale="3";
ms [label="MS"], bsc [label="BSC"], mgw [label="MGW@MSC"], omsc [label="OsmoMSC"], osc [label="OsmoSIPcon"], sip [label="External SIP World"];
|||;
... [label="Mobile Originated call handled via osmo-sip-conector, OsmoMSC, OsmoMGW: No reliable 18x"];
|||;
ms <-> bsc [label="RR Establishment"];
ms <-> omsc [label="MM Procedures (Auth/Ciph/...)"];
...;
ms -> omsc [label="CC SETUP (called, bearer_cap)"];
omsc -> osc [label="MNCC_SETUP_IND (calling, called, bearer_cap)"];
osc box osc [label="bearer_cap -> SDP"];
osc -> sip [label="SIP INVITE (from, to, SDP)"];
osc <- sip [label="SIP 100 Trying (NO rel100)"];
omsc <- osc [label="MNCC_CALL_PROC_REQ"];
ms <- omsc [label="CC CALL PROCEEDING"];
...;
sip box sip [label="SIP UA starts ringing"];
osc <- sip [label="SIP 180 Ringing (NO SDP)"];
omsc <- osc [label="MNCC_ALERT_REQ"];
ms <- omsc [label="CC ALERTING"];
omsc box omsc [label="generate BSSMAP codec list from\n(without knowing SIP/SDP)"];
bsc <- omsc [label="BSSMAP ASSIGNMENT REQ"];
ms <-> bsc [label="RR ASSIGNMENT or RR MODE MODIFY"];
bsc -> omsc [label="BSSMAP ASSIGNMENT COMPL"];
omsc box omsc [label="determine chosen codec from\nBSSMAP Assignment"];
mgw <- omsc [label="MGCP CRCX (RAN-side, chosen codec)"];
mgw -> omsc [label="MGCP CRCX OK (RAN-side)"];
sip box sip [label="User accepts call"];
osc <- sip [label="SIP 200 OK (SDP, finally)"];
omsc <- osc [label="MNCC_SETUP_RSP"];
ms <- omsc [label="CC CONNECT"];
omsc <- osc [label="MNCC_RTP_CONNECT"];
omsc <- osc [label="MNCC_RTP_CREATE.req (SDP from SIP)"];
mgw <- omsc [label="MGCP CRCX (EXT-side)"];
mgw box mgw [label="If there is a common codec between RAN and CN, use that\nElse: Configure Transcoding in MGW"];
mgw -> omsc [label="MGCP CRCX OK (EXT-side)"];
omsc -> osc [label="MNCC_RTP_CREATE.resp (CN side IP/Port)"];
mgw <- omsc [label="MGCP MDCX (sendrecv)"];
mgw -> omsc [label="MGCP MDCX OK"];
ms -> omsc [label="CC CONNECT ACK"];
omsc -> osc [label="MNCC_SETUP_COMPL_IND"];
osc -> sip [label="SIP ACK"];
...;
ms box ms [label="MO user releases call"];
ms -> omsc [label="CC DISCONNECT"];
omsc -> osc [label="MNCC_DISC_IND"];
osc -> sip [label="SIP BYE"];
osc <- sip [label="SIP 200 OK"];
omsc <- osc [label="MNCC_REL_REQ"];
ms <- omsc [label="CC RELEASE COMMAND"];
ms -> omsc [label="CC REELASE COMPLETE"];
omsc -> osc [label="MNCC_REL_CNF"];
mgw <- omsc [label="MGCP DLCX (all connections on EP)"];
mgw -> omsc [label="MGCP DLCX OK"];
bsc <- omsc [label="BSSMAP CLEAR CMD"];
ms <-> bsc [label="RR Disconnect"];
bsc -> omsc [label="BSSMAP CLEAR CMPL"];
}

72
common/chapters/msc_mncc_mo_sip_rel18x_mgcp.msc Normal file
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msc {
hscale="3";
ms [label="MS"], bsc [label="BSC"], mgw [label="MGW@MSC"], omsc [label="OsmoMSC"], osc [label="OsmoSIPcon"], sip [label="External SIP World"];
|||;
... [label="Mobile Originated call handled via osmo-sip-conector, OsmoMSC, OsmoMGW: Reliable 18x"];
|||;
ms <-> bsc [label="RR Establishment"];
ms <-> omsc [label="MM Procedures (Auth/Ciph/...)"];
...;
ms -> omsc [label="CC SETUP (called, bearer_cap)"];
omsc -> osc [label="MNCC_SETUP_IND (calling, called, bearer_cap)"];
osc box osc [label="bearer_cap -> SDP"];
osc -> sip [label="SIP INVITE (from, to, SDP)"];
osc <- sip [label="SIP 100 Trying (rel100)"];
omsc <- osc [label="MNCC_CALL_PROC_REQ"];
ms <- omsc [label="CC CALL PROCEEDING"];
...;
sip box sip [label="SIP UA starts ringing"];
osc <- sip [label="SIP 180 Ringing (SDP)"];
osc box osc [label="bearer_cap <- SDP"];
omsc <- osc [label="MNCC_ALERT_REQ"];
ms <- omsc [label="CC ALERTING"];
osc -> sip [label="SIP PRACK (180 Ringing)"];
osc <- sip [label="SIP 200 (PRACK)"];
omsc box omsc [label="generate BSSMAP codec list from\nSIP-negotiated bearer_cap"];
bsc <- omsc [label="BSSMAP ASSIGNMENT REQ"];
ms <-> bsc [label="RR ASSIGNMENT or RR MODE MODIFY"];
bsc -> omsc [label="BSSMAP ASSIGNMENT COMPL"];
omsc box omsc [label="determine chosen codec from\nBSSMAP Assignment"];
mgw <- omsc [label="MGCP CRCX (RAN-side, chosen codec)"];
mgw -> omsc [label="MGCP CRCX OK (RAN-side)"];
omsc <- osc [label="MNCC_RTP_CREATE.req (SDP from SIP)"];
mgw <- omsc [label="MGCP CRCX (EXT-side)"];
mgw box mgw [label="If there is a common codec between RAN and CN, use that\nElse: Configure Transcoding in MGW"];
mgw -> omsc [label="MGCP CRCX OK (EXT-side)"];
omsc -> osc [label="MNCC_RTP_CREATE.resp (CN side IP/Port)"];
...;
sip box sip [label="User accepts call"];
osc <- sip [label="SIP 200 OK (INVITE)"];
omsc <- osc [label="MNCC_SETUP_RSP"];
ms <- omsc [label="CC CONNECT"];
omsc <- osc [label="MNCC_RTP_CONNECT"];
mgw <- omsc [label="MGCP MDCX (sendrecv)"];
mgw -> omsc [label="MGCP MDCX OK"];
ms -> omsc [label="CC CONNECT ACK"];
omsc -> osc [label="MNCC_SETUP_COMPL_IND"];
osc -> sip [label="SIP ACK"];
...;
ms box ms [label="MO user releases call"];
ms -> omsc [label="CC DISCONNECT"];
omsc -> osc [label="MNCC_DISC_IND"];
osc -> sip [label="SIP BYE"];
osc <- sip [label="SIP 200 OK"];
omsc <- osc [label="MNCC_REL_REQ"];
ms <- omsc [label="CC RELEASE COMMAND"];
ms -> omsc [label="CC REELASE COMPLETE"];
omsc -> osc [label="MNCC_REL_CNF"];
mgw <- omsc [label="MGCP DLCX (all connections on EP)"];
mgw -> omsc [label="MGCP DLCX OK"];
bsc <- omsc [label="BSSMAP CLEAR CMD"];
ms <-> bsc [label="RR Disconnect"];
bsc -> omsc [label="BSSMAP CLEAR CMPL"];
}

71
common/chapters/msc_mncc_mt_sip_mgcp.msc Normal file
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msc {
hscale="3";
ms [label="MS"], bsc [label="BSC"], mgw [label="MGW@MSC"], omsc [label="OsmoMSC"], osc [label="OsmoSIPcon"], sip [label="External SIP World"];
|||;
... [label="Mobile Terminated call handled via osmo-sip-conector, OsmoMSC, OsmoMGW"];
|||;
sip box sip [label="Somebody in SIP world dials a\nGSM subscriber"];
osc <- sip [label="SIP INVITE (from, to, SDP)"];
osc box osc [label="SDP -> bearer_capabilities"];
omsc <- osc [label="MNCC_SETUP_REQ (calling, called, bearer_cap)"];
osc -> sip [label="SIP 100 Trying"];
bsc <- omsc [label="BSSMAP PAGING"];
ms <- bsc [label="RR PAGING"];
ms <-> bsc [label="RR Establishment"];
ms <-> omsc [label="MM Procedures (Auth/Ciph/...)"];
...;
ms <- omsc [label="CC SETUP (calling, bearer_cap)"];
ms -> omsc [label="CC CALL CONFIRMED (bearer_cap)"];
omsc box omsc [label="generate BSSMAP codec list from\nMS-negotiated bearer_cap"];
bsc <- omsc [label="BSSMAP ASSIGNMENT REQ"];
ms <-> bsc [label="RR ASSIGNMENT or RR MODE MODIFY"];
bsc -> omsc [label="BSSMAP ASSIGNMENT COMPL"];
omsc box omsc [label="determine chosen codec from\nBSSMAP Assignment"];
mgw <- omsc [label="MGCP CRCX (RAN-side, chosen codec)"];
mgw -> omsc [label="MGCP CRCX OK (RAN-side)"];
omsc -> osc [label="MNCC_CALL_CONF_IND"];
omsc <- osc [label="MNCC_RTP_CREATE.req"];
mgw <- omsc [label="MGCP CRCX (EXT-side)"];
mgw box mgw [label="If there is a common codec between RAN and CN, use that\nElse: Configure Transcoding in MGW"];
mgw -> omsc [label="MGCP CRCX OK (EXT-side)"];
omsc -> osc [label="MNCC_RTP_CREATE.resp (CN side IP/Port)"];
...;
ms box ms [label="MS starts ringing"];
ms -> omsc [label="CC ALERTING"];
omsc -> osc [label="MNCC_ALERT_IND"];
osc -> sip [label="SIP 180 Ringing (SDP w/chosen codec?)"];
...;
...;
ms box ms [label="MT user accepts call"];
ms -> omsc [label="CC CONNECT"];
omsc -> osc [label="MNCC_SETUP_CNF"];
osc -> sip [label="SIP 200 OK (SDP w/chossen codec)"];
osc <- sip [label="SIP ACK"];
omsc <- osc [label="MNCC_RTP_CONNECT"];
mgw <- omsc [label="MGCP MDCX (MNCC-side, sendrecv)"];
mgw -> omsc [label="MGCP MDCX OK"];
omsc <- osc [label="MNCC_SETUP_COMPL_REQ"];
ms <- omsc [label="CC CONNECT ACK"];
mgw <- omsc [label="MGCP MDCX (RAN-side, sendrecv)"];
mgw -> omsc [label="MGCP MDCX OK"];
...;
ms box ms [label="MT user releases call"];
ms -> omsc [label="CC DISCONNECT"];
omsc -> osc [label="MNCC_DISC_IND"];
osc -> sip [label="SIP BYE"];
osc <- sip [label="SIP 200 OK"];
omsc <- osc [label="MNCC_REL_REQ"];
ms <- omsc [label="CC RELEASE COMMAND"];
ms -> omsc [label="CC REELASE COMPLETE"];
omsc -> osc [label="MNCC_REL_CNF"];
mgw <- omsc [label="MGCP DLCX (all connections on EP)"];
mgw -> omsc [label="MGCP DLCX OK"];
bsc <- omsc [label="BSSMAP CLEAR CMD"];
ms <-> bsc [label="RR Disconnect"];
bsc -> omsc [label="BSSMAP CLEAR CMPL"];
}