4.2.3Call flows
The drafting session on Call flows will be in parallel with the plenary, and it will focus on the first Invite flow
S2-001456 from Siemens: Mobile Terminated Call Routing between IMS and CS
This contribution proposes two ways of handling the calls originated by the CS domain/PSTN to the IM subsystem (the S-CSCF more precisely), each one with advantages and drawbacks: one minimises the number of flows, the other enables to use MAP and ISUP without modification. N4 guidance is asked for choosing one of the 2 approaches.
It also proposes that the text of S2-001281 plus some additional text is included in 23.228.
Discussion: Alcatel stressed that the proposed flows and deciding to which domain (CS or PS+IM) to route the call is a procedure almost similar to call forwarding, so it might be much more complex than a “lookup at a database”, as presented in Siemens’ contribution.
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