Diameter Gy – Credit-Control-Answer (CCA) command

This section describes the Diameter Gy CCA message format as defined in RFC 4006. Strikethrough formatted AVPs should not appear or are ignored in CCA. Italic formatted AVPs listed after [AVP] are not defined in RFC 4006. 

 <Credit-Control-Answer> ::= < Diameter Header: 272, PXY > 
                                  < Session-Id > 
                                  { Result-Code } 
                                  { Origin-Host } 
                                  { Origin-Realm } 
                                  { Auth-Application-Id } 
                                  { CC-Request-Type } 
                                  { CC-Request-Number }
                                  [ User-Name ] 
                                  [ CC-Session-Failover ] 
                                  [ CC-Sub-Session-Id ]
[ Acct-Multi-Session-Id ]
[ Origin-State-Id ]
[ Event-Timestamp ]
[ Granted-Service-Unit ]
                                 *[ Multiple-Services-Credit-Control ] 
                                  [ Cost-Information]
[ Final-Unit-Indication ]
[ Check-Balance-Result ]
                                  [ Credit-Control-Failure-Handling ]
                                  [ Direct-Debiting-Failure-Handling ]
[ Validity-Time]
                                 *[ Redirect-Host]
[ Redirect-Host-Usage ]
[ Redirect-Max-Cache-Time ]
                                 *[ Proxy-Info ]
                                 *[ Route-Record ]
                                 *[ Failed-AVP ] 
                                 *[ AVP ] 
                                  [ Charging-Rule-Base-Name ]

Diameter Gy – CCA message top level AVPs

Diameter Gy CCA: top level AVP description provides a detailed description for each top level AVP present in a Diameter Gy CCA message. Unless mentioned different in the description, the AVP is present in Initial, Update and Terminate messages. Grouped AVPs are marked with ‟↳ (grouped AVP)”. The grouped AVP format and embedded AVP description and format are described in section Diameter Gy – CCA message grouped AVPs.

Table 1. Diameter Gy CCA: top level AVP description
AVP code AVP name Description

258

Auth-Application-Id

Fixed value: 4 = Diameter Credit Control Application

263

Session-id

A session is a logical concept at the application layer that exists between the Diameter client and the Diameter server; it is identified via the Session-Id AVP.

Format:

<DiameterIdentity>;<high 32 bits>;<low 32 bits>

  • <DiameterIdentity> is the configured origin host

  • <high 32 bits> are encoded as the Diameter initialization time (the number of seconds since 1 Jan 1970)

  • <low 32 bits> are encoded as a sequentially increasing number starting at 1

Example: bng.nokia.com;1326398325;1

264

Origin-Host

Diameter Identity. Used as destination host in the next Diameter message.

Example: server.nokia.com

268

Result-Code

Values:

2001 = Diameter Success

3xxx = Protocol Errors

4001 = Diameter Authentication Rejected

4010 = Diameter End User Service Denied (CCA-U only)

4011 = Diameter Credit Control Not Applicable

4012 = Diameter Credit Limit Reached (CCA-U only)

5003 = Diameter Authorization Rejected

5030 = Diameter User Unknown

5031 = Diameter Rating Failed (CCA-U only)

Values not listed result in a Diameter Session Failure and the Credit Control Failure Handling action is executed.

278

Failed-AVP

↳ (grouped AVP)

Provides debugging information when CCR is rejected or not fully processed because of unsupported AVP or AVP value.

296

Origin-Realm

Diameter Identity. Used as destination host in the next Diameter message.

Example: nokia.com

415

CC-Request-Number

Values:

CCA-Initial: 0

CCA-Update and CCA-Termination: sequence number

416

CC-Request-Type

Values:

1 = Initial Answer

2 = Update Answer

3 = Termination Answer

418

CC-Session-Failover

Specifies if a secondary peer should be attempted in case of Credit Control Failure Handling.

Overrides the configured failover value in configure subscriber-mgmt diameter-application-policy application-policy-name on-failure [failover {enabled | disabled}] [handling {continue | retry-and-terminate | terminate}]

Values:

0 = Failover Not Supported

1 = Failover Supported

427

Credit-Control-Failure-Handling

Action to take when the Credit Control client does not receive a valid CCA message within the interval specified with tx-timer (default 10s).

Overrides the configured failure handling: configure subscriber-mgmt diameter-application-policy application-policy-name on-failure [failover {enabled | disabled}] [handling {continue | retry-and-terminate | terminate}]

Values:

0 = Terminate

1 = Continue

2 = Retry and terminate

456

Multiple-Services-Credit-Control

↳ (grouped AVP)

Up to sixteen Multiple-Services-Credit-Control AVPs, each corresponding to a rating group. A rating group maps to a category configured in a category-map:

configure subscriber-mgmt category-map category-map-name category category-name rating-group rating-group-id

3GPP – 1004

Charging-Rule-Base-Name

(CCA-I only)

Assigns the category-map or overrides the category-map obtained in authentication.

value: category-map-name: the name of the category-map to be used for this session
Table 2. Diameter Gy CCA: top level AVP format
AVP code AVP name Standard Data format Flags

258

Auth-Application-Id

RFC 6733/RFC 4006

Unsigned 32

M

263

Session-id

RFC 6733

UTF8 String

M

264

Origin-Host

RFC 6733

Diameter Identity

M

268

Result-Code

RFC 6733/RFC 4006

Unsigned 32

M

278

Failed-AVP

↳ (grouped AVP)

RFC 6733

Grouped

M

296

Origin-Realm

RFC 6733

Diameter Identity

M

415

CC-Request-Number

RFC 4006

Unsigned 32

M

416

CC-Request-Type

RFC 4006

Enumerated

M

418

CC-Session-Failover

RFC 4006

Enumerated

M

427

Credit-Control-Failure-Handling

RFC 4006

Enumerated

M

456

Multiple-Services-Credit-Control

↳ (grouped AVP)

RFC 4006

Grouped

M

3GPP – 1004

Charging-Rule-Base-Name

TS 29.212

Octet String

V, M

Diameter Gy – CCA message grouped AVPs

This section provides an overview of CCA message grouped AVPs.

Diameter Gy CCA – Failed-AVP grouped AVP

Grouped AVP format as defined in RFC 6733: 

 <Failed-AVP> ::= < AVP Header: 279 > 
                       1* {AVP}

The failed-AVP AVP contains the entire AVP that could not be processed successfully.

Diameter Gy CCA – Multiple-Services-Credit-Control grouped AVP

Grouped AVP format as defined in RFC 4006: Strikethrough formatted AVPs should not appear or are ignored in CCA. Italic formatted AVPs listed after [AVP] are not defined in RFC 4006. 

  Multiple-Services-Credit-Control ::= < AVP Header: 456 > 
                                           [ Granted-Service-Unit ]  
                                           [ Requested-Service-Unit ]
                                          *[ Used-Service-Unit ]
[ Tariff-Change-Usage ]
                                          *[ Service-Identifier ]
                                           [ Rating-Group ]
                                          *[ G-S-U-Pool-Reference ]
                                           [ Validity-Time ] 
                                           [ Result-Code ] 
                                           [ Final-Unit-Indication ] 
                                          *[ AVP ] 
                                           [ Time-Quota-Threshold ]
[ Volume-Quota-Threshold ]
[ Quota-Holding-Time ]
Table 3. Diameter Gy CCA: Multiple-Services-Credit-Control grouped AVP description
AVP code AVP name Description

268

Result-Code

Values:

2001 = Diameter Success

4010 = Diameter End User Service Denied

4011 = Diameter Credit Control Not Applicable

4012 = Diameter Credit Limit Reached

5003 = Diameter Authorization Rejected

5031 = Diameter Rating Failed

Values not listed result in a Diameter Session Failure and the Credit Control Failure Handling action is executed.

430

Final-Unit-Indication

↳ (grouped AVP)

This AVP indicates that the Granted-Service-Unit contains the final units for the service. When this quota is consumed, a final reporting is started (CCR-U or CCR-T) with reporting reason ‟Final”. The final reporting can be disabled with configure subscriber-mgmt diameter-application-policy application-policy-name gy out-of-credit-reporting quota-exhausted

431

Granted-Service-Unit

↳ (grouped AVP)

Amount of service units that the Diameter credit control client can provide to the end user until the service must be released or a new CCR message must be sent.

432

Rating-Group

Rating group for which the quota is allocated. Corresponds with a category within a category-map defining the queues/policers and direction to monitor.

configure subscriber-mgmt category-map category-map-name category category-name rating-group rating-group-id

448

Validity-Time

If the granted service units have not been consumed within the validity time, a CCR-U is triggered with Reporting Reason AVP set to 4 (Validity Time).

Value in seconds

3GPP – 868

Time-Quota-Threshold

Threshold preventing time quota exhaustion before refreshing. When the used time quota exceeds the threshold, a CCR-U is triggered with Reporting Reason AVP set to 0 (Threshold).

Value in seconds

3GPP – 869

Volume-Quota-Threshold

Threshold preventing volume quota exhaustion before refreshing. When the used volume quota exceeds the threshold, a CCR-U is triggered with Reporting Reason AVP set to 0 (Threshold).

Value in octets

3GPP – 871

Quota-Holding-Time

Specifies an idle-timeout associated with the granted service units. If no traffic associated with the quota is observed for the time specified by the quota holding time, then a CCR-U is triggered with Reporting Reason AVP set to 1 (Quota Holding Time). The idle time is measured per sampling period.

Value in seconds
Table 4. Diameter Gy CCA: Multiple-Services-Credit-Control grouped AVP format
AVP code AVP name Standard Data format Flags

268

Result-Code

RFC 6733/RFC 4006

Unsigned 32

M

430

Final-Unit-Indication

↳ (grouped AVP)

RFC 4006

Grouped

M

431

Granted-Service-Unit

↳ (grouped AVP)

RFC 4006

Grouped

M

432

Rating-Group

RFC 4006

Unsigned 32

M

448

Validity-Time

RFC 4006

Unsigned 32

M

3GPP – 868

Time-Quota-Threshold

TS 32.299

Unsigned 32

V, M

3GPP – 869

Volume-Quota-Threshold

TS 32.299

Unsigned 32

V, M

3GPP – 871

Quota-Holding-Time

TS 32.299

Unsigned 32

V, M

Diameter Gy CCA – Final-Unit-Indication grouped AVP

Grouped AVP format as defined in RFC 4006: Strikethrough formatted AVPs should not appear or are ignored in CCA. 

  Final-Unit-Indication ::= < AVP Header: 430 > 
                                { Final-Unit-Action }
                               *[ Restriction-Filter-Rule ]
                               *[ Filter-Id ]
                                [ Redirect-Server ]
Table 5. Diameter Gy CCA: Final-Unit-Indication grouped AVP description
AVP code AVP name Description

443

Redirect-Server

↳ (grouped AVP)

This AVP is included when the Final-Unit-Action AVP is set to REDIRECT (1) and contains the URL to which the user must be redirected. The URL overrides the URL specified with configure subscriber-mgmt category-map category-map-name category category-name exhausted-credit-service-level ingress-ip-filter-entries entry entry-id action http-redirect url allow-override.

The AVP is ignored when the out-of-credit action is different from change-service-level or when no http-redirect action with allow-override is configured.

449

Final-Unit-Action

If the value is Terminate, then the session is terminated and the corresponding subscriber host deleted.

If the value is Redirect or Restrict Access, then the out-of-credit action as configured for that rating group (category) is executed:

configure subscriber-mgmt credit-control-policy policy-name out-of-credit-action change-service-level {continue | disconnect-host | block-category | change-service-level}

or

configure subscriber-mgmt category-map category-map-name category category-name out-of-credit-action-override {continue | block-category | change-service- level}

Values:

0 = Terminate

1 = Redirect

2 = Restrict Access
Table 6. Diameter Gy CCA: Final-Unit-Indication grouped AVP format
AVP code AVP name Standard Data format Flags

443

Redirect-Server

↳ (grouped AVP)

RFC 4006

Enumerated

M

449

Final-Unit-Action

RFC 4006

Enumerated

M

Diameter Gy CCA - Redirect-Server grouped AVP

Grouped AVP format as defined in RFC 4006.

      Redirect-Server ::= < AVP Header: 434 >
                          { Redirect-Address-Type }
                          { Redirect-Server-Address }
Table 7. Diameter Gy CCA: Redirect-Server grouped AVP description
AVP code AVP name Description

433

Redirect-Address-Type

Must be set to URL (2). The Redirect-Server-Address AVP is ignored when set to a different value.

435

Redirect-Server-Address

Contains the IPv4 HTTP redirect URL that is used when the Final-Unit-Action REDIRECT is triggered for the rating group that corresponds with the MSCC in which the Final-Unit-Indication AVP is included.

The URL specified in the Redirect-Server-Address AVP is only used when all following conditions are met:

  • The Final-Unit-Indication AVP is present in the Multiple-Services-Credit-Control AVP

  • The Final-Unit-Action is set to REDIRECT (1)

  • The Redirect-Address-Type is set to URL (2)

  • The out-of-credit action for the corresponding rating group is set to change-service-level:

    configure subscriber-mgmt credit-control-policy policy-name out-of-credit-action change-service-level

    or

    configure subscriber-mgmt category-map category-map-name category category-name out-of-credit-action-override change-service-level

  • An IPv4 HTTP redirect action with allow-override is specified as exhausted-credit-service-level for the corresponding rating group: configure subscriber-mgmt category-map category-map-name category category-name exhausted-credit-service-level ingress-ip-filter-entries entry entry-id action http-redirect url allow-override

435 (continued)

In all other cases, the Redirect-Server-Address AVP is ignored.

The maximum URL length is 255 characters and can include the same macro substitutions such as $IP (customer's IP address), $MAC (customer's MAC address), $URL (original requested URL), as supported for a static configured HTTP redirect URL.
Table 8. Diameter Gy CCA: Redirect-Server grouped AVP format
AVP code AVP name Standard Data format Flags

433

Redirect-Address-Type

RFC 4006

Enumerated

M

435

Redirect-Server-Address

RFC 4006

Enumerated

M

Diameter Gy CCA – Granted-Service-Unit grouped AVP

Grouped AVP format as defined in RFC 4006. Strikethrough formatted AVPs should not appear or are ignored in CCA. 

 Granted-Service-Unit ::= < AVP Header: 431 >  
                                 [ Tariff-Time-Change ]
                                 [ CC-Time ]  
                                 [ CC-Money ]
                                 [ CC-Total-Octets ] 
                                 [ CC-Input-Octets ]
[ CC-Output-Octets ]
[ CC-Service-Specific-Units ]
                                *[ AVP ]

For a single rating group (category), either Volume or Time quota can be granted. Granting both time and volume quota for a single rating group is not supported and results in a Diameter Session Failure and the execution of the Credit Control Failure Handling action.

Table 9. Diameter Gy CCA: Granted-Service-Unit grouped AVP description
AVP code AVP name Description

420

CC-Time

Amount of granted time

Value: in seconds

421

CC-Total-Octets

Total number of octets regardless of the direction (quota can be consumed for ingress or egress)

Value: in octets
Table 10. Diameter Gy CCA: Granted-Service-Unit grouped AVP format
AVP code AVP name Standard Data format Flags

420

CC-Time

RFC 4006

Unsigned 32

M

421

CC-Total-Octets

RFC 4006

Unsigned 64

M