3GPP TS 24.228 -- IMS Signalling flows for Register
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| Session Initiation: Non Hiding |
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| Session Initiation: Hiding |
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This shows the registration signalling flow for the scenario that UE1 loses the GPRS attachment in current
visited access network and roams to makes a new GPRS attachment in a new visited access network without
deregistration from its previous network. When
UE1 starts registration via the new visited access network and P-CSCF2, the home S-CSCF in the home IMS
network initiates the deregistration to P-CSCF1 in the previous visited network. It is assumed that the old P-CSCF
has subscribed the event package to the S-CSCF and the subscription has not expired.
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For the reason of
simplicity, the authentication procedure is not shown because it has no technical impact on this flow.
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I-CSCF1 sends the Cx-Query signalling flow to the HSS (Visited Network Identifier, subscriber
identity, home domain name,). Because user has not deregistered with its previous network, HSS
finds a S-CSCF assigned for that user and treats this as a re-registration procedure. Therefore, the HSS
returns S-CSCF1 name to I-CSCF1.
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S-CSCF1 notifies the HSS to update its location information for that subscriber. The HSS sends a
response to S-CSCF1 to acknowledge the update of location information and also with the user
profile.
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As there was a change in the user's registration status and the old P-CSCF is still subscribed to the
registration event package for that user, therefore, S-CSCF1 sends a NOTIFY request to P-CSCF1.
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