| msc { |
| hscale="2"; |
| ms[label="MS,BSS"],__msc[label="MSC"],hlr[label="HLR proxy"],home[label="Home HLR"]; |
| |
| ms => __msc [label="Location Updating Request (Periodic)"]; |
| ms rbox __msc [label="Authentication,\nusing the next of 5 auth tuples the MSC has stored"]; |
| __msc => hlr [label="Update Location Request"]; |
| hlr rbox hlr [label="Use already set up proxy path"]; |
| hlr abox hlr [label="(8) proxy cache already has all information to answer"]; |
| __msc <= hlr [label="Insert Subscriber Data Request"]; |
| __msc => hlr [label="Insert Subscriber Data Result"]; |
| __msc <= hlr [label="Update Location Result"]; |
| ms <= __msc [label="Location Updating Accept"]; |
| hlr rbox hlr [label="(9) Verify Update Location with home HLR"]; |
| |||; |
| --- [label="if the home HLR has no changes and accepts"]; |
| hlr => home [label="Update Location Request"]; |
| hlr <= home [label="Insert Subscriber Data Request"]; |
| hlr => home [label="Insert Subscriber Data Result"]; |
| hlr abox hlr [label="Notice identical MSISDN"]; |
| hlr <= home [label="Update Location Result"]; |
| |||; |
| --- [label="if the home HLR is unreachable"]; |
| hlr => home [label="Update Location Request"]; |
| hlr abox hlr [label="no link\nor\nresponse timeout"]; |
| hlr rbox hlr [label="Don't care, carry on"]; |
| |||; |
| --- [label="if the home HLR has a modified MSISDN, and accepts"]; |
| hlr => home [label="Update Location Request"]; |
| hlr <= home [label="Insert Subscriber Data Request"]; |
| hlr => home [label="Insert Subscriber Data Result"]; |
| hlr abox hlr [label="Notice changed MSISDN"]; |
| __msc <= hlr [label="Insert Subscriber Data Request"]; |
| __msc => hlr [label="Insert Subscriber Data Result"]; |
| hlr <= home [label="Update Location Result"]; |
| |||; |
| --- [label="if the home HLR rejects"]; |
| hlr => home [label="Update Location Request"]; |
| hlr <= home [label="Update Location Error"]; |
| __msc <= hlr [label="Cancel Location Request"]; |
| __msc => hlr [label="Cancel Location Result"]; |
| hlr rbox hlr [label="Clear subscriber cache"]; |
| } |