I am a new actor in this forum and I hope that I will be able to give as much help as I could receive from you.
Here is my question:
When a subscriber A sends an SMS to a subscriber B, I would like to ensure that the subscriber B belongs to my HPLMN (related to the Mobile Number Portability).
It is possible to have this confirmation from the HLR by requested it with an SRI containing subscribers B MSISDN; if the HLR returns the corresponding IMSI then it is still in my HPLMN, if not the subscribers is ported "OUT".
But is it always possible??? For example when B has its mobile device swithed off, ...
I think that the HLR is able to give this information whatever the subscriber status but I need a confirmation.
Thank you in advance for your help.