7/21/2019 sbmain_elab_UEport

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3G IMS Illustrated(2nd Level)

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Marketing Aspects

References/Qui

3G !kt "#$ain Basics

%#ntents

&r#$ %kt/!kt '# IMS

3G IMS Arcitecture

Intr#ducti#n

Better Communication

3G IMS perati#n

'ake*a*+reakA++rev,IMS

'e e-act p#rt nu$+er.

For simplicitys sake we did not show the security association procedure, which should n

take place between the UE and P-CSCF during the egistration procedure!

"uring this procedure the UE and P-CSCF negotiate security #$PSec% parameters they wilto talk with each other &or the li&e o& the registration #e!g! when the UE makes phone callsthese parameters are the secured ports numbers that will be used on both sides!

(hus when a termination occurs the P-CSCF needs to o)erwrite the port number, passed CSCF in the Request-URI&ield with the one determined during the security association p

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