Question: In an Originating PLMN, according to signaling interworking protocols, what is the requirement for the formats of SCCP Called Party Address and SCCP Calling Party Address if the called destination is in a different country than HLR A?
Option 1: Both must be in national E.164 format.
Option 2: One can be in international E.164 format, and the other in national E.164 format.
Option 3: At least one of them (either Called or Calling Party Address) must be in international E.164 format.
Option 4: Both must be in international E.164 format.
Explanation: When the called destination is in a different country than HLR A, to ensure global uniqueness and interoperability, both the SCCP Called Party Address and the SCCP Calling Party Address must be in international E.164 format. This ensures seamless communication across different countries, adhering to standardized global formatting for efficient call routing and connection establishment.