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IMS Signalling flows (TS 24.228)

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|   R1. Registration   |   R2. Re‑registration   |   R3. UE subscription for registration state   |   R4. P‑CSCF subscription for registration state   |   R5. Deregistration in S‑CSCF   |   R6. Deregistration in HSS   |   R7. Deregistration upon UE roaming and registration to a new network   |   R8. Re‑authentication   |   S1. Session Initiation: mobile origination and termination roaming, with different network operators   |   S2. Session Initiation: mobile origination and termination in home network   |   S3. Session Initiation: origination in CS Network, and mobile termination in home network   |   S4. Session Initiation: mobile origination in home network, termination in CS network   |   S5. Session Initiation: mobile origination and termination in home network, but terminating UE roaming and busy   |