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Reply To: PSI(provide subscribe information)


The HLR sends PSI when receives a ATI
msg (any Time interrogation). These msg it is not a message to route call , it is used to location procedures (The origen can be another externa system not only a MSC/VLR) and the HLR return informatión such as Cell id , State (Busy, idle, det) and time of location .In general the destination VLR doesn,t return a MSRN so PSI procedure can not be used instead PRN procedure