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Overview

The

P-Charging-Vector flags:

• createPChargingVector at IP Signaling Profile
• storePChargingVector at IP Signaling Profile
• pChargingVectorHeader transparency flag at IP Signaling Profile
• interOperatorId flag at Trunk Group

A P-CSCF does not transparently pass a P-Charging-Vector header received from UE in any request to IMS core. P-CSCF creates a new P-Charging-Vector header for each request (REGISTER, INVITE, and OOD non-INVITE) containing a unique "icid-value" and "icid-generated-at" parameters and insert the same in the outgoing request towards the core.

The

This is achieved by:

• Disabling pChargingVectorHeader transparency flag at the IP Signaling Profile attached with the TG, towards the IMS Core side.
• Enabling createPChargingVector flag at the IP Signaling Profile attached with the TG, towards the IMS Core side.
• Disabling storePChargingVector flag at the IP Signaling Profile attached with the TG, towards the UE.

In addition, P-CSCF includes orig-IOI parameter in the newly-created PCV for REGISTER and INVITE messages. The value for orig-IOI parameter is configurable through InterOperatorID parameter from sipTrunkGroup object.

The

• Enabling pChargingVectorHeader transparency flag in the IP Signaling Profile attached with the TG, towards the IMS Core side.
• Disabling createPChargingVector flag in the IP Signaling Profile attached with the TG, towards the IMS Core side.
• Enabling the storePChargingVector flag in the IP Signaling Profile attached with the TG, both towards the UE side and IMS Core side.

SBC Provisioning

When the P-Charging-Vector Header transparency option is selected in the IP Signaling Profile screen, the

When the Create P-Charging-Vector option is selected in the IP Signaling Profile screen, the

CDR Processing

The

The CLI syntax to enable/disable the createPChargingVector flag for P-CSCF and IBCF is shown below:

% set profiles signaling ipSignalingProfile <profile name towards core> commonIpAttributes flags createPChargingVector <enable | disable>

For populating interOperatorID parameter, use:

% set addressContext default zone defaultSigZone sipTrunkGroup <EGRESS_TG_NAME> signaling interOperatorID <interoperator ID for MGCF> 

The CLI syntax to enable/disable pChargingVectorHeader transparency flag for IBCF is shown below:

% set profiles signaling ipSignalingProfile <egress name> commonIpAttributes transparencyFlags pChargingVectorHeader <enable | disable> 

The CLI syntax to enable/disable the storePChargingVector flag for P-CSCF and IBCF is shown below:

% set profiles signaling ipSignalingProfile <profile name towards core> commonIpAttributes flags storePChargingVector <enable | disable> 

Transit-IOI Handling

A P-Charging-Vector header is used to correlate the charging records generated by different entities on the path of the call. To include the information of the transit carriers for charging purposes, The P-Charging-Vector header can also carry a new parameter transit-IOI, if the transit carriers are involved in a call. The Transit Inter Operator Identifier (Transit-IOI) is shared between sending, transit and receiving networks, service providers, or content providers. The transit-IOI header field parameter is an indexed value that is incremented each time a value is added. If P-Charging-Vector transparency is enabled or create/store P-Charging-Vector is enabled, the

Based on local policy, the

For configuration details, refer to:

• SIP Trunk Group - Signaling - CLI
• Sip SIP Trunk Group - Signaling (EMA)

PCV Interworking Enhancement

The SBC Core includes a signaling profile, NNI Profile, in support of the Inter-IMS Network to Network Interface (II-NNI) and interworking of charging parameters for SIP to/from SIP-I/T/GWGW/ISUP calls. The NNI Profile is attached to a ingress SIP Trunk Group. The following sections describe how the SBC performs SIP to SIP-I and SIP-I to SIP interworking based on the NNI Profile.

SIP to SIP-I Interworking (Originating Carrier info and Orig-CA Interworking)

The SBC supports the following functionality only when a SIP message containing the "P-Charging-Vector" header is received and processed by the SBC on the SIP side of a SIP to SIP-I/T or a SIP to SIP-GWGW-SIP-I/T/ISUP call. 

The following call flows are supported when the call is originated from Mobile SIP side:

• Mobile—“SIP”—SBC — “GWGW”—GSX —“ISUP”— PSTN
• Mobile—“SIP"—SBC—“GWGW”—SBC—“SIP-I/T”—C5IMS
• Mobile—“SIP”—SBC—“SIP-I/T”—C5IM
• Mobile—“SIP”—SBC—“GWGW”—SBC—Other Carrier

When an NNI Profile is configured for a SIP Trunk Group and the SBC receives INVITE messages with P-Charging-Vector header (which contains ttc-charging-parameter) for this SIP Trunk Group, the SBC does not send these parameters as part of "P-Charging-Vector" header on the other side.

chargeAreaInformation (CAI)

If the received ttc-charging-parameter contains chargeAreaInformation (CAI) sub-parameter, the SBC includes the received CAI value in the policy request message towards PSX and also sends it in the ISUP IAM message body (as Message-Area-Information parameter - parameter code = 253) of SIP-I/T or over GW-GW message.

If the received ttc-charging-parameter does not contain CAI sub-parameter but configured it under NNI profile, the SBC includes the configured CAI value in the policy request message towards PSX and also sends it in the ISUP IAM message body (as Message-Area-Information parameter - parameter code = 253) of SIP-I/T or over GW-GW message.

carrierInformationTransfer (CARI)

If the received ttc-charging-parameter contains carrierInformationTransfer (CARI) sub-parameter with the category as "olec", the SBC includes the received CARI values in the policy request message towards PSX and also sends it in the ISUP IAM message body (as Carrier-Information-Transfer parameter - parameter code = 241) of SIP-I/T or over GW-GW message.

If the received ttc-charging-parameter does not contain (CARI) sub-parameter (or) received CARI value other than cat-olec and CARI value is configured in the NNI profile, SBC includes the configured CARI value in the policy request message towards PSX and also sends it in the ISUP IAM message body (as Carrier-Information-Transfer parameter - parameter code = 241) of SIP-I/T or over GW-GW message.

AdditionalPartyCategory (AUC)

ForwardCallIndicator (FCI)

The SBC behavior when receiving "P-charging-vector" headers and carrierInformationTransfer parameters is explained in the following table.

Example

ChargeAreaInformation:

P-Charging-Vector: icicd-value=ABC;icid-generated-at=DEF;orig-ioi=GHI;ttc-charging-params="cai=32000"

Carrier information transfer as:

P-Charging-Vector: icicd-value=ABC;icid-generated-at=DEF;orig-ioi=GHI;ttc-charging-params="cai=32000;cari=iecind-3,cat-olec,code-0901"

Additional party category as:

P-Charging-Vector: icicd-value=ABC;icid-generated-at=DEF;orig-ioi=GHI;ttc-charging-params="cai=32000;cari=iecind-3,cat-olec,code-0901;auc=mobile_2-3;auc=fixed-1-2"

Forward Call Indicators as:

P-Charging-Vector: icicd-value=ABC;icid-generated-at=DEF;orig-ioi=GHI;ttc-charging-params="cai=32000;cari=iecind-3,cat-olec,code-0901;auc=mobile_2-3;auc=fixed-1-2;fci=nii-nat,oa-isdn"

• The SBC receives:
  • P-charging-vector header
  • carrierInformationTransfer parameters
• The carrierInformationTransfer  parameter contains "olec" category

The SBC takes the following actions:

• Sets the value of carrierInformationTransfer as “iecind-3” (originating network).
• Adds the parameters carrierCategory and  carrierInfo and populates carrierInformationTransfer category as "olec". The SBC then sends carrierInformationTransfer to the PSX and in the ISUP IAM message body of SIP-I/T or over GW-GW message.
• Populates carrierIdCode as follows:
  • If received in a message (as part of "olec" category), populate using received value. 
  • If carrierIdCode is not received, the SBC populates it using the configured value from carrierCategoryAndInfo for olec data.
  • If neither received nor configured on Trunk Group, the SBC terminates further processing and does not interwork with carrierInformationTransfer parameter.

The SBC takes the following actions:

• Sets the value of carrierInformationTransfer to “iecind-3” (originating network).

• Adds the parameters carrierCategory and  carrierInfo and populates carrierInformationTransfer category  as "olec". The SBC then sends the carrierInformationTransfer to the PSX and in the ISUP IAM message body of SIP-I/T or over GW-GW message as per existing functionality.

• Populates carrierIdCode as configured value.

SIP-I to SIP Interworking (Terminating Carrier info and Term-CA Interworking)

If the parameter chargeAreaInformation is received by the SBC from SIP-I/T side with either of ACM/CPG/ANM ISUP message body or over GW-GW message, the SBC uses it to populate the parameter chargeAreaInformation (of "P-Charging-Vector" header) and sends it in a SIP message as per existing functionality.

If the parameter carrierInformationTransfer is received by the SBC from SIP-I/T side with either of ACM/CPG ISUP message body or over GW-GW message and the parameter contains carrierCategory as "tlec", the SBC processes the parameter as follows:

• Sets the value of Transit Carrier Indicator to “iecind-0” (terminating network).
• Adds the parameters carrierCategory and  carrierInfo, and populates carrierInformationTransfer  category as "tlec". If the parameter carrierInformationTransfer does not contain "tlec", the carrierInformationTransfer of "P-Charging-Vector" header must not be set.
• Sends the parameter carrierInformationTransfer in "P-Charging-Vector" header in a SIP message.

If the parameters additionalPartyCategoryFirst/Second are received by the SBC from SIP-I/T side with either ACM/CPG/ANM/CON ISUP message body or received over GW-GW message, the SBC uses them to populate additionalPartyCategoryFirst/Second parameters of "P-Charging-Vector" header and send them in a SIP message.