| Informational 
                                             				
                                           | 
                                    
                                       | DIAMETER_MULTI_ROUND_AUTH 
                                             				
                                           | 1001 
                                             				
                                           | Subsequent
                                             				  messages triggered by client shall also used in Authentication and to get
                                             				  access of required resources. Generally used in Diameter NAS. 
                                             				
                                           | 
                                    
                                       | Success 
                                             				
                                           | 
                                    
                                       | DIAMETER_SUCCESS 
                                             				
                                           | 2001 
                                             				
                                           | Request
                                             				  processed Successfully. 
                                             				
                                           | 
                                    
                                       | DIAMETER_LIMITED_SUCCESS 
                                             				
                                           | 2002 
                                             				
                                           | Request is
                                             				  processed but some more processing is required by Server to provide access to
                                             				  user. 
                                             				
                                           | 
                                    
                                       | Protocol Errors [E-bit
                                                					 set] 
                                             				
                                           | 
                                    
                                       | DIAMETER_COMMAND
                                             				
                                           _UNSUPPORTED 
                                             				
                                           | 3001 
                                             				
                                           | Server
                                             				  returns it if Diameter Command-Code is un-recognized by server. 
                                             				
                                           | 
                                    
                                       | DIAMETER_UNABLE
                                             				
                                           _TO_DELIVER 
                                             				
                                           | 3002 
                                             				
                                           | Message
                                             				  cannot be delivered because there is no Host with Diameter URI present in
                                             				  Destination-Host AVP in associated Realm. 
                                             				
                                           | 
                                    
                                       | DIAMETER_REALM_NOT
                                             				
                                           _SERVED 
                                             				
                                           | 3003 
                                             				
                                           | Intended
                                             				  Realm is not recognized. 
                                             				
                                           | 
                                    
                                       | DIAMETER_TOO_BUSY 
                                             				
                                           | 3004 
                                             				
                                           | Shall return
                                             				  by server only when server unable to provide requested service, where all the
                                             				  pre-requisites are also met. Client should also send the request to alternate
                                             				  peer. 
                                             				
                                           | 
                                    
                                       | DIAMETER_LOOP_DETECTED 
                                             				
                                           | 3005 
                                             				
                                           | - 
                                             				
                                           | 
                                    
                                       | DIAMETER_REDIRECT 
                                             				
                                           _INDICATION 
                                             				
                                           | 3006 
                                             				
                                           | In Response
                                             				  from Redirect Agent. 
                                             				
                                           | 
                                    
                                       | DIAMETER_APPLICATION 
                                             				
                                           _UNSUPPORTED
                                             				  
                                             				
                                           | 3007 
                                             				
                                           | - 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID_HDR_BITS 
                                             				
                                           | 3008 
                                             				
                                           | It is sent
                                             				  when a request is received with invalid bits combination for considered
                                             				  command-code in DIAMETER Header structure. For example, Marking Proxy-Bit in
                                             				  CER message. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID_AVP_BITS 
                                             				
                                           | 3009 
                                             				
                                           | It is sent
                                             				  when a request is received with invalid flag bits in an AVP. 
                                             				
                                           | 
                                    
                                       | DIAMETER_UNKNOWN_PEER 
                                             				
                                           | 3010 
                                             				
                                           | A DIAMETER
                                             				  server can be configured whether it shall accept DIAMETER connection from all
                                             				  nodes or only from specific nodes. If it is configured to accept connection
                                             				  from specific nodes and receives CER from message from any node other than
                                             				  specified. 
                                             				
                                           | 
                                    
                                       | Transient Failures [Could
                                                					 not satisfy request at this moment] 
                                             				
                                           | 
                                    
                                       | DIAMETER_AUTHENTICATION 
                                             				
                                           _REJECTED 
                                             				
                                           | 4001 
                                             				
                                           | Returned by
                                             				  Server, most likely because of invalid password. 
                                             				
                                           | 
                                    
                                       | DIAMETER_OUT_OF_SPACE 
                                             				
                                           | 4002 
                                             				
                                           | Returned by
                                             				  node, when it receives accounting information but unable to store it because of
                                             				  lack of memory. 
                                             				
                                           | 
                                    
                                       | ELECTION_LOST 
                                             				
                                           | 4003 
                                             				
                                           | Peer
                                             				  determines that it has lost election by comparing Origin-Host value received in
                                             				  CER with its own DIAMETER IDENTITY and found that received DIAMETER IDENTITY is
                                             				  higher. 
                                             				
                                           | 
                                    
                                       | Permanent Failures [To
                                                					 inform peer, request is failed, should not be attempted again] 
                                             				
                                           | 
                                    
                                       | DIAMETER_AVP
                                             				
                                           _UNSUPPORTED 
                                             				
                                           | 5001 
                                             				
                                           | AVP marked
                                             				  with Mandatory Bit, but peer does not support it. 
                                             				
                                           | 
                                    
                                       | DIAMETER_UNKNOWN 
                                             				
                                           _SESSION_ID 
                                             				
                                           | 5002 
                                             				
                                           | - 
                                             				
                                           | 
                                    
                                       | DIAMETER_AUTHORIZATION 
                                             				
                                           _REJECTED 
                                             				
                                           | 5003 
                                             				
                                           | User can not
                                             				  be authorized. For example, Comes in AIA on s6a interface. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID_AVP_VALUE 
                                             				
                                           | 5004 
                                             				
                                           | - 
                                             				
                                           | 
                                    
                                       | DIAMETER_MISSING_AVP 
                                             				
                                           | 5005 
                                             				
                                           | Mandatory
                                             				  AVP in request message is missing. 
                                             				
                                           | 
                                    
                                       | DIAMETER_RESOURCES 
                                             				
                                           _EXCEEDED 
                                             				
                                           | 5006 
                                             				
                                           | A request
                                             				  was received that cannot be authorized because the user has already expended
                                             				  allowed resources. An example of this error condition is a user that is
                                             				  restricted to one dial-up PPP port, attempts to establish a second PPP
                                             				  connection. 
                                             				
                                           | 
                                    
                                       | DIAMETER_CONTRADICTING
                                             				
                                           _AVPS 
                                             				
                                           | 5007 
                                             				
                                           | Server has
                                             				  identified that AVPs are present that are contradictory to each other. 
                                             				
                                           | 
                                    
                                       | DIAMETER_AVP_NOT_ALLOWED 
                                             				
                                           | 5008 
                                             				
                                           | Message is
                                             				  received by node (Server) that contain AVP must not be present. 
                                             				
                                           | 
                                    
                                       | DIAMETER_AVP_OCCURS 
                                             				
                                           _TOO_MANY_TIMES 
                                             				
                                           | 5009 
                                             				
                                           | If message
                                             				  contains the a AVP number of times that exceeds permitted occurrence of AVP in
                                             				  message definition. 
                                             				
                                           | 
                                    
                                       | DIAMETER_NO_COMMON 
                                             				
                                           _APPLICATION
                                             				  
                                             				
                                           | 5010 
                                             				
                                           | In response
                                             				  of CER if no common application supported between the peers. 
                                             				
                                           | 
                                    
                                       | DIAMETER_UNSUPPORTED 
                                             				
                                           _VERSION 
                                             				
                                           | 5011 
                                             				
                                           | Self
                                             				  explanatory. 
                                             				
                                           | 
                                    
                                       | DIAMETER_UNABLE 
                                             				
                                           _TO_COMPLY 
                                             				
                                           | 5012 
                                             				
                                           | Message
                                             				  rejected because of unspecified reasons. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID_BIT 
                                             				
                                           _IN_HEADER 
                                             				
                                           | 5013 
                                             				
                                           | When an
                                             				  unrecognized bit in the Diameter header is set to one. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID 
                                             				
                                           _AVP_LENGTH 
                                             				
                                           | 5014 
                                             				
                                           | Self
                                             				  explanatory. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID 
                                             				
                                           _MESSAGE_LENGTH 
                                             				
                                           | 5015 
                                             				
                                           | Self
                                             				  explanatory. 
                                             				
                                           | 
                                    
                                       | DIAMETER_INVALID_AVP 
                                             				
                                           _BIT_COMBO 
                                             				
                                           | 5016 
                                             				
                                           | For example,
                                             				  marking AVP to Mandatory while message definition doesn't say so. 
                                             				
                                           | 
                                    
                                       | DIAMETER_NO_COMMON 
                                             				
                                           _SECURITY 
                                             				
                                           | 5017 
                                             				
                                           | In response
                                             				  of CER if no common security mechanism supported between the peers. 
                                             				
                                           |