Tech-
invite
3GPP
space
IETF
space
SIP
↠
Examples
Grammars
Presence
⇾
Main
Services
Transaction
Dialog
IMS
TS 24.228
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§7.2.2
–
§7.3.2
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§7.4.2
UE1 starts the media flow for this session, and responds to the 200 (OK) response with an ACK request sent to P-CSCF1.