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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="CM Service Request / Paging Response"];
__msc => hlr [label="Send Auth Info Request"];
hlr abox hlr [label="there still are unsent auth tuples\nin the cache"];
hlr rbox hlr [label="Send cached, fresh tuples"];
__msc <= hlr [label="Send Auth Info Result\ncontaining auth tuples\nfrom the proxy cache"];
ms <= __msc [label="Authentication Request"];
ms => __msc [label="USIM requests UMTS AKA resync\nAuth Failure with AUTS"];
__msc => hlr [label="Send Auth Info Request\ncontaining AUTS IE"];
hlr rbox hlr [label="Mark all UMTS AKA tuples as stale"];
--- [label="If the home HLR responds in time"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result\nwith 5 auth tuples"];
hlr rbox hlr [label="clear tuple cache, store new tuples"];
__msc <= hlr [label="Send Auth Info Result"];
ms rbox __msc [label="Authentication"];
hlr rbox hlr [label="fill up the tuple cache as necessary"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result"];
...;
--- [label="If the home HLR is unreachable"];
hlr => home [label="Send Auth Info Request"];
hlr abox hlr [label="no link\nor\nresponse timeout"];
hlr rbox hlr [label="Store the AUTS received earlier,\nand set up a timer to retry SAI\n(a few minutes?)"];
--- [label="If no GSM AKA fallback is allowed"];
__msc <= hlr [label="Send Auth Info Error"];
ms rbox __msc [label="Detach"];
--- [label="If GSM AKA fallback is allowed"];
hlr rbox hlr [label="Resend only GSM AKA tuples, already sent earlier"];
__msc <= hlr [label="Send Auth Info Result\ncontaining GSM AKA auth tuples\nfrom the proxy cache"];
ms rbox __msc [label="2G: Authentication\n3G: Detach"];
---;
hlr abox hlr [label="AUTS timer triggers"];
hlr => home [label="Send Auth Info Request"];
hlr <= home [label="Send Auth Info Result"];
hlr rbox hlr [label="clear tuple cache, store new tuples"];
hlr rbox hlr [label="continue to fill up the cache as necessary"];
}
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