Conclusion: See conclusion on S2-001396, presenting another solution to the same problem.
S2-001396 from Alcatel: Routing (CS/PS) of incoming calls (on 23.228, R00)
In Alcatel’s contribution, the choice of the domain to use is made by a Service Platform and not the HSS because of the complexity of the choice.
Flows are proposed on: how to make the choice to route the call to CS or to IM (2 cases are identified: the incoming call is received either by the CS or by the IM), and then how to actually route it to CS or to IM in both cases.
Discussion: It is explained that the call cannot be routed to the S CSCF because of efficiency reason (it’s inefficient to route the call to the S CSCF potentially in a remote visited network to finally realise that the call has to be handled by the CS domain).
Nokia stressed that there is no attach/detach procedure with the IM subsystem, so a better wording has to be found.
KPN proposed a combination of Siemens and Alcatel solutions: first the HSS is contacted, and if it is not able to route the call, then the Service Platform is involved. Alcatel stressed this is already the case: a plain CS user will be reached via the classical GSM procedure, as well as an IP user is reached via the classical IP procedure.
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