UE pertaining to an IMS network is roaming in CS Network (No VOLTE roaming agreement).
The IMS network is invoked in MT-call (I-CSCF, S-CSCF,...)
How the interaction to the CS domain (in the Visited network) is done?
How late call forwarding is done if the call is unanswered?
Can you please indicate the 3GPP specifications related to it?