All the contributions related to this topic were presented before some generals conclusions were proposed by a drafting group on this topic (see bellow).
S2-001442 from BT: Revised proposal for registration flows
This contribution is proposing flows for registration, presented in 3 parts: a first part, applicable to both hS-CSCF and vS-CSCF control, at the end of which the I-CSCF determines whether the Serving CSCF is to be in the Home PLMN or the Visited PLMN (based upon received local network capabilities and also the subscribers preference.). Then comes one of the two following parts: one applicable to hS-CSCF control, the other to vS-CSCF control.
Discussion: In figure 2, flows H3, H4 and H5: AT&T has some concerns about flows which are not answered by the receiving entity.
The use of the proxy CSCF address by HSS given by H3 in figure 2 is not clear.
Upon request from Alcatel, BT clarified that the flows imply a periodic terminal registration.
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