IMS Signalling flows for session initiation: Hiding
MO#2 / S-S#1b / MT#2 (page 3 of 3)
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Mobile Origination, located in home network
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Different network operators performing origination and termination,
with configuration hiding by both network operators
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Mobile Termination, located in home network
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Before proceeding with session establishment, UE2 waits for two events. First, the resource
reservation initiated in step #4 must complete successfully. Second, the resource reservation initiated
by the originating endpoint must complete successfully (which is indicated by message UPDATE received by
UE2). UE2 now alerts the
destination subscriber of an incoming session attempt; it indicates this to the calling party by
a 180 Ringing provisional response sent to P-CSCF2.
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Record-Route:
P-CSCF2 rewrites the Record-Route header field value to remove the port number and the
comp=sigcomp parameter from its own entry.
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Record-Route:
P-CSCF1 rewrites the Record-Route header to add the comp=sigcomp parameter to its
own SIP URI and its port number negotiated during the security agreement.
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Request-URI:
Takes the value of the Contact header of the received 180 Ringing response.
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Security-Verify:
Contains the security agreement as represented by the received Security-Server header.
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