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laforge, 10/21/2017 03:12 PM

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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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* Osmocom 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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{{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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    OsmoMSC -> OsmoHLR [label="GSUP"];
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    OsmoMSC -> OsmoSIP [label="MNCC"];
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    OsmoMSC [color=red];
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    OsmoSIP [label="osmo-sip-connector"];
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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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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