Thanks for the reply. I really appreciate it.
Just need some clarification:
1. Are networks usually configured to obtain MSRN at call setup i.e. at call setup the HLR gets the MSRN from the VLR (as opposed to the VLR passing the MSRN at registration or location update)?
2. Could you kindly explain Implicit Detached Mode?
Do you mean to say that regardless of the ms status given in the response from the HLR to the GMSC in reponse to routing query the GMSC routes the call the the responsible VMSC unless the HLR indicates the ms is swithced off or Implicitly Detached.
Please correct me if I misunderstood you.