Tech-
invite
3GPP
space
IETF
space
SIP
↠
Examples
Grammars
Presence
⇾
Main
Services
Transaction
Dialog
IMS
TS 24.228
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§7.2.3
–
§7.3.5
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§7.4.3
UE1 is located in the home network, and determines the P-CSCF via the CSCF discovery procedure.
P-CSCF1 knows the name/address of the S-CSCF from a prior Registration performed by UE1.