Bogdan-Andrei IANCU writes:
SER does hop-by-hop CANCEL propagation. If the corresponding INVITE was forwarded statefully, TM will forward the CANCEL to exactly the same RURI as the INVITE disregarding completely the original CANCEL RURI - so in this case you have just to relay the CANCEL and TM will take care to send it to the right location.
thanks bogdan for confirming this. and to jan, thanks that you answered.
-- juha