How the DRA (Diameter Routing Agent) server works ? .On what basis it is routing the traffic to the network nodes like OCS ,GGSN and PCRF.
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6.1.6. Request Routing
Diameter request message routing is done via realms and applications. A Diameter message that may be forwarded by Diameter agents (proxies, redirects or relays) MUST include the target realm in the Destination-Realm AVP and one of the application identification AVPs Auth-Application-Id, Acct-Application-Id or Vendor-Specific- Application-Id. The realm MAY be retrieved from the User-Name AVP, which is in the form of a Network Access Identifier (NAI). The realm portion of the NAI is inserted in the Destination-Realm AVP.
Diameter agents MAY have a list of locally supported realms and
applications, and MAY have a list of externally supported realms and
applications. When a request is received that includes a realm
and/or application that is not locally supported, the message is
routed to the peer configured in the Realm Routing Table (see Section 2.7).
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