Destination-Realm AVP ( 283 )
The Destination-Realm AVP contains the realm to which the message is to be routed. The Destination-Realm AVP MUST NOT be present in Answer messages. Request messages whose ABNF does not list the Destination-Realm AVP as a mandatory AVP are inherently non-routable messages. This AVP SHOULD be placed as close to the Diameter header as possible.
Reference: RFC 6733
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