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{hscale=2}
ms = MS,BSS
msc = MSC
hlr = HLR proxy
home = Home HLR
ms -> msc CM Service Request / Paging Response
msc -> hlr Send Auth Info Request
hlr () . Use already set up proxy path
hlr <> . All cached auth tuples have been sent to the MSC before
--- If no GSM AKA fallback is allowed
msc <- hlr Send Auth Info Error
ms () msc Detach
--- If GSM AKA fallback is allowed
hlr () . (6) Resend only GSM AKA tuples, already sent earlier
msc <- hlr Send Auth Info Result
containing GSM AKA auth tuples
from the proxy cache
ms () msc 2G: Authentication
3G: Detach
ms () msc Continue the CM Service / Paging action
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