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Request Routing Information used for routing: Application-Id: present is in the header Destination-Host OR Destination-Realm AVP Routing rules: If local identity == Destination-Host AVP then process locally, otherwise If peer identity == Destination-Host AVP then send that peer, otherwise (use Peer Table) Lookup realm table with Destination-Realm and AppId If found send to the designated next-hop Otherwise, send an UNABLE_TO_DELIVER answer Use of Request Queue Successfully forwarded request are queued |