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3GPP IP Multimedia Subsystem


IMS Signalling flows (3GPP TS 24.228)


Warning: the last version of 3GPP TS 24.228 is v5.15, published in October 2006. It has not been upgraded to Rel-6 and the following note has been added to the scope of the document:
The detailed signalling flows in the present document can be referenced, but the specification will not be further maintained. The example flows can contain errors and can only be regarded as guidelines for persons wanting an overview of how SIP messages with detailed header information could in some example cases look like within 3GPP. Other not documented signalling flows can be as relevant and compliant as the ones that are outlined in this specification.

IMS Registration

R1. User not registered

R2. User currently registered

R3. UE subscription for registration state event package

R4. P-CSCF subscription for registration state event package

R5. Network-initiated deregistration event occuring in the S-CSCF

R6. Network-initiated deregistration event occuring in the HSS

R7. Network-initiated deregistration upon UE roaming and registration to a new network

R8. Network initiated re-authentication

 

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IMS Registration (Hiding)

hR1. User not registered

hR2. Mobile initiated deregistration

 

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IMS Session Initiation

S1. Mobile origination and termination roaming, with different network operators

S2. Mobile origination and termination in home network

S3. Origination in CS Network, and Mobile termination in home network

S4. Mobile origination in home network, Termination in CS network

S5. Mobile origination and termination in home network, but terminating UE roaming and busy

 

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IMS Session Initiation (Hiding)

hS1. mobile origination roaming, mobile termination in (hiding) home network

hS2. mobile origination in (hiding) home network, mobile termination in another (hiding) network

hS3. mobile origination in (hiding) home network, mobile termination in another network

hS4. mobile origination in home network, mobile termination in another (hiding) network

 

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