How LTE paging is done for CSFB MT call?

Assume both parties in LTE network where no IMS is present

How the paging done to B … by MME…agree? and MSC of A sends the paging to MME of B agree?.. question is how MSC knows where the B party is?

I think it’s due to MME configure TAC-LAC mapping, and UE do combined attach CS/ps.