IMS Signalling flows for session initiation: Hiding
MO#1b / S-S#2 / MT#2 (page 3 of 3)
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Mobile origination, roaming, with I-CSCF in home network
providing configuration independence
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Single Network Operator performing Origination and Termination
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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 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:
Header entries of the home network of I-CSCF1 are tokenized. I-CSCF1 itself and UE1
addresses are not subject to tokenization.
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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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