Question: When an SMS Router forwards a MT Forward Short Message Request to an MME or SGSN, and the request includes the Maximum-Retransmission-Time AVP, what action does the SMS Router take regarding the SMS-GMSC's identity and address?
Option 1: The SMS Router appends its own Diameter Identity and E.164 number to the existing SMS-GMSC information.
Option 2: The SMS Router stores the SMS-GMSC's information but forwards the request with only its own SMS Router Diameter Identity and E.164 number.
Option 3: The SMS Router ignores the Maximum-Retransmission-Time AVP and forwards the request without altering the SMS-GMSC's identity and address.
Option 4: The SMS Router rejects the request due to the presence of the Maximum-Retransmission-Time AVP.
Explanation: This is correct because when the MT Forward Short Message Request includes the Maximum-Retransmission-Time AVP, the SMS Router must store the original SMS-GMSC's Diameter Identity and address but replace them with its own identity and E.164 number when forwarding the request to the MME or SGSN, ensuring proper routing and potential retransmission handling while tracking the original sender.