Ladder diagrams for key procedures » History » Version 2
osmith, 11/25/2021 01:53 PM
| 1 | 1 | osmith | h1. Ladder diagrams for key procedures |
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| 4 | |||
| 5 | 2 | osmith | h2. Call |
| 6 | 1 | osmith | |
| 7 | Illustrating how BSSMAP Assignment Request, Assignment Complete, Clear Command and Clear Complete is patched while going through BSCNAT as well as the related MGCP logic. |
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| 8 | |||
| 9 | {{mscgen_link() |
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| 10 | msc { |
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| 11 | hscale = "2"; |
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| 12 | |||
| 13 | bsc [label="BSC\n"], |
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| 14 | mgwbsc [label="MGW-BSC\nIP: X"], |
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| 15 | bscnat [label="BSCNAT\n"], |
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| 16 | mgwnat [label="MGW-NAT\nIP: Y"], |
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| 17 | msc_ [label="MSC\n"], |
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| 18 | mgwmsc [label="MGW-MSC\nIP: Z"]; |
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| 19 | |||
| 20 | |||
| 21 | 2 | osmith | bsc => bscnat [label="SCCP CR(BSSMAP Complete L3 Info)"]; |
| 22 | bscnat box bscnat [label="Create SCCP connection mapping"]; |
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| 23 | bscnat => msc_ [label="SCCP CR(BSSMAP Complete L3 Info)"]; |
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| 24 | |||
| 25 | ...; |
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| 26 | 1 | osmith | bsc box mgwmsc [label="DTAP omitted from diagram, assuming Call Confirmed"]; |
| 27 | 2 | osmith | ...; |
| 28 | 1 | osmith | |
| 29 | msc_ => mgwmsc [label="MGCP CRCX\nrtpbridge/*@msc"]; |
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| 30 | msc_ <= mgwmsc [label="MGCP OK (Port: M)\nrtpbridge/1@msc"]; |
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| 31 | |||
| 32 | |||; |
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| 33 | bscnat <= msc_ [label="BSSMAP Assignment Request (AoIP: IP Z, Port M)"]; |
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| 34 | |||; |
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| 35 | |||
| 36 | bscnat box mgwnat [label="Allocate CN-side connection"]; |
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| 37 | bscnat => mgwnat [label="MGCP CRCX (CI: IP Z, Port M)\nrtpbridge/*@nat"]; |
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| 38 | bscnat <= mgwnat [label="MGCP OK (Port C)\nrtpbridge/1@nat"]; |
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| 39 | |||
| 40 | bscnat box mgwnat [label="Allocate RAN-side connection"]; |
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| 41 | bscnat => mgwnat [label="MGCP CRCX\nrtpbridge/1@nat"]; |
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| 42 | bscnat <= mgwnat [label="MGCP OK (Port R)\nrtpbridge/1@nat"]; |
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| 43 | |||
| 44 | |||; |
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| 45 | bsc <= bscnat [label="BSSMAP Assignment Request (AoIP: IP Y, Port R)"]; |
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| 46 | |||; |
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| 47 | |||
| 48 | bsc box mgwbsc [label="Allocate BTS-side connection"]; |
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| 49 | bsc => mgwbsc [label="MGCP CRCX\nrtpbridge/*@bsc"]; |
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| 50 | bsc <= mgwbsc [label="MGCP OK (Port A)\nrtpbridge/1@bsc"]; |
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| 51 | |||
| 52 | bsc => mgwbsc [label="MGCP MDCX (CI: IP W, Port: B)\nrtpbirdge/1@bsc"]; |
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| 53 | bsc <= mgwbsc [label="MGCP OK (Port A)\nrtpbridge/1@bsc"]; |
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| 54 | |||
| 55 | bsc box mgwbsc [label="Allocate BSCNAT-side connection"]; |
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| 56 | bsc => mgwbsc [label="MGCP CRCX (CI: IP Y, Port R)\nrtpbridge/1@bsc"]; |
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| 57 | bsc <= mgwbsc [label="MGCP OK (Port E)\nrtpbridge/1@bsc"]; |
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| 58 | |||
| 59 | |||; |
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| 60 | bsc => bscnat [label="BSSMAP Assignment Complete (AoIP: IP X, Port E)"]; |
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| 61 | |||; |
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| 62 | |||
| 63 | bscnat => mgwnat [label="MGCP MDCX (CI: IP X, Port E)\nrtpbridge/1@nat"]; |
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| 64 | bscnat <= mgwnat [label="MGCP OK (Port R)\nrtpbirdge/1@nat"]; |
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| 65 | |||
| 66 | |||; |
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| 67 | bscnat => msc_ [label="BSSMAP Assignment Complete (AoIP: IP Y, Port C)"]; |
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| 68 | |||; |
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| 69 | |||
| 70 | msc_ => mgwmsc [label="MGCP MDCX (CI: IP Y, Port C)\nrtpbridge/1@msc"]; |
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| 71 | msc_ <= mgwmsc [label="MGCP OK (Port M)\nrtpbridge/1@msc"]; |
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| 72 | |||
| 73 | ...; |
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| 74 | bsc box mgwmsc [label="Voice call in progress"]; |
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| 75 | ...; |
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| 76 | |||
| 77 | msc_ => mgwmsc [label="MGCP DLCX\nrtpbridge/1@msc"]; |
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| 78 | mgwmsc => msc_ [label="MGCP OK\nrtpbridge/1@msc"]; |
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| 79 | msc_ => mgwmsc [label="MGCP DLCX\nrtpbridge/1@msc"]; |
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| 80 | mgwmsc => msc_ [label="MGCP OK\nrtpbridge/1@msc"]; |
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| 81 | |||
| 82 | |||; |
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| 83 | msc_ => bscnat [label="BSSMAP Clear Command"]; |
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| 84 | |||; |
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| 85 | |||
| 86 | bscnat => mgwnat [label="MGCP DLCX\nrtpbridge/1@nat"]; |
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| 87 | bscnat <= mgwnat [label="MGCP OK\nrtpbridge/1@nat"]; |
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| 88 | 2 | osmith | bscnat => mgwnat [label="MGCP DLCX\nrtpbridge/1@nat"]; |
| 89 | bscnat <= mgwnat [label="MGCP OK\nrtpbridge/1@nat"]; |
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| 90 | 1 | osmith | |
| 91 | |||; |
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| 92 | bscnat => bsc [label="BSSMAP Clear Command"]; |
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| 93 | |||; |
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| 94 | |||
| 95 | bsc => mgwbsc [label="MGCP DLCX\nrtpbridge/1@nat"]; |
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| 96 | bsc <= mgwbsc [label="MGCP OK\nrtpbridge/1@nat"]; |
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| 97 | bsc => mgwbsc [label="MGCP DLCX\nrtpbridge/1@nat"]; |
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| 98 | bsc <= mgwbsc [label="MGCP OK\nrtpbridge/1@nat"]; |
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| 99 | |||
| 100 | |||; |
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| 101 | bsc => bscnat [label="BSSMAP Clear Complete"]; |
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| 102 | |||; |
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| 103 | |||
| 104 | |||; |
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| 105 | 2 | osmith | bscnat => msc_ [label="BSSMAP Clear Complete"]; |
| 106 | 1 | osmith | |||; |
| 107 | } |
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| 108 | }} |
