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msc {
hscale="2";
ms[label="MS,BSS"],__msc[label="MSC"],hlr[label="HLR proxy"],home[label="Home HLR"];
ms => __msc [label="Location Updating Request (IMSI Attach)"];
__msc => hlr [label="Send Auth Info Request"];
hlr abox hlr [label="No proxy cache data available for this subscriber"];
hlr rbox home [label="mslookup finds the home HLR"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result\nwith 5 auth tuples"];
hlr rbox hlr [label="(1) Keep a copy of the auth tuples"];
__msc <= hlr [label="Send Auth Info Result"];
__msc rbox __msc [label="MSC stores 5 auth tuples,\nuses the first one now,\nand keeps the rest for later requests"];
ms rbox __msc [label="Authentication"];
__msc => hlr [label="Update Location Request"];
hlr => home [label="Update Location Request"];
hlr <= home [label="Insert Subscriber Data Request\n(with subscriber's MSISDN)"];
hlr rbox hlr [label="proxy HLR caches the MSISDN"];
__msc <= hlr [label="Insert Subscriber Data Request"];
__msc => hlr [label="Insert Subscriber Data Result"];
hlr => home [label="Insert Subscriber Data Result"];
hlr <= home [label="Update Location Result"];
__msc <= hlr [label="Update Location Result"];
ms <= __msc [label="Location Updating Accept"];
hlr abox hlr [label="After successful Update Location, check the cache"];
hlr rbox hlr [label="(2) Ask for more auth tuples to cache\n(amount of tuples configurable)"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result"];
hlr rbox hlr [label="store 5 more tuples"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result"];
hlr rbox hlr [label="store yet 5 more tuples"];
}
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