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OsmoMSC » History » Version 15

laforge, 05/11/2018 11:15 AM

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h1. OsmoMSC
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OsmoMSC is the Osmocom implementation of a Mobile Switching Center (MSC).
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It implements the following interfaces:
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* 3GPP AoIP over M3UA or SUA towards BSCs, for example [[OsmoBSC:]], possibly via a STP like [[OsmoSTP:]]
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* 3GPP IuCS over M3UA or SUA towards RNCs or HNBGWs, for example [[OsmoHNBGW:]], possibly via a STP like [[OsmoSTP:]]
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* Osmocom [[cellular-infrastructure:GSUP]] towards an HLR such as [[OsmoHLR:]]
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* SMPP v3.4 for external SMS entities (minimal SMSC is built-in)
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* MGCP for controlling an external Media Gateway like [[OsmoMGW:]]
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* MNCC for external call-control handlers, such as [[osmo-sip-connector:]] for SIP trunks
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* Osmocom VTY interface for configuration + introspection
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* Osmocom CTRL interface for programmatic access to internal state/configuration
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h2. Position in a typical network
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{{graphviz_link()
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digraph G {
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    rankdir = LR;
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    OsmoBTS -> OsmoBSC [label="Abis/IP"];
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    OsmoBSC -> OsmoMSC [label="3GPP AoIP"];
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    hNodeB -> OsmoHNBGW [label="Iuh"];
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    OsmoHNBGW -> OsmoMSC [label="IuCS"];
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    OsmoMSC -> OsmoHLR [label="GSUP"];
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    OsmoMSC -> OsmoSIP [label="MNCC"];
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    OsmoMSC [color=red];
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    { rank=same; OsmoMSC; OsmoMGW };
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    OsmoMSC -> OsmoMGW [label="MGCP"];
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    OsmoSIP [label="osmo-sip-connector"];
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    OsmoSIP -> PBX [label="SIP Trunk"];
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}
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}}
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h2. History
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OsmoMSC was the result of splitting [[OsmoNITB:]] into three parts during the 2017 NITB-split.  Parts of [[OsmoNITB:]] became [[OsmoBSC:]], other parts became [[OsmoHLR:]], while the mobility management, call control and SMS handling became [[OsmoMSC:]].  At the time of the rewrite, the entire MSC and VLR state machines have been properly re-implemented using "osmo-fsm":http://ftp.osmocom.org/api/latest/libosmocore/core/html/group__fsm.html
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{{include(cellular-infrastructure:MacroBinaryPackages)}}
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h2. Manuals
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* "osmomsc-usermanual.pdf":http://ftp.osmocom.org/docs/latest/osmomsc-usermanual.pdf
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* "osmomsc-vty-reference.pdf":http://ftp.osmocom.org/docs/latest/osmomsc-vty-reference.pdf
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h2. Source code
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The source code is available from @git.osmocom.org@ (module @osmo-msc@).
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Public read-only access is available via
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<pre>
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git clone git://git.osmocom.org/osmo-msc.git
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</pre>
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You can browse it via cgit:  https://git.osmocom.org/osmo-msc
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Contributions are welcome via [[cellular-infrastructure:Gerrit]].
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h2. Test Suite
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We have a TTCN-3 test suite as part of our [[cellular-infrastructure:Titan_TTCN3_Testsuites]]
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* source code: http://git.osmocom.org/osmo-ttcn3-hacks/tree/msc
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* results: https://jenkins.osmocom.org/jenkins/view/TTCN3/job/ttcn3-msc-test/
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h2. Contact
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* Contact us via the openbsc@ mailing list, see [[cellular-infrastructure:Mailing Lists]].
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* Contributions are welcome via [[cellular-infrastructure:Gerrit]].
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* Git repository browser at https://git.osmocom.org/osmo-msc
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