SHAKEN Fields in CDR for Identity Header Passthrough

Overview

This feature enables the SBC to record PASSporT information in the SIP Identity headers passing through the SBC in the Call Data Records (CDRs). This information helps the operators to determine how their traffic originates. The information is logged in the CDR even if there is no subsequent service processing of the PASSporTs. A maximum of nine identity headers are logged in the CDR for ingress and egress.

The functionality is enabled only when the STI profile is enabled and is attached to the Trunk Group (TG) where the call is received and egressed.

To record the PASSporTs information in the CDR, the SBC stores the base64 decoded Identity headers received and sent in the SIP INVITE message. The SBC populates the decoded identity headers in the ATTEMPT and STOP records. The overall length of the CDR string to log identity headers does not exceed 2400 characters. This includes the comma separators between identity headers. If an identity header exceeds this limit, then that particular identity header is dropped. The identity headers that fit within the limit are logged. Individual headers that do not fit are dropped. The priority order for writing in the CDR from the highest to the lowest is, SHAKEN, RPH, RCD, DIVs and OTHER. If the higher priority headers take up all the space, then the lower priority headers are not written in the CDR.

The ingress and egress identity header information becomes redundant if a call becomes stable. If a switchover happens after the call becomes stable, then the information is retained. If such a call is released after the switchover, then the STOP CDR stores the information about the ingress and egress identity headers.

Fields added to the STOP and ATTEMPT Records

The CDR fields "Ingress Identity Headers Received" and "Egress Identity Headers signed/sent" are added to the STOP and ATTEMPT CDR records. The ingress identity headers string is sent from the SIPSG/CC to CAM. Refer to the SBC Core Billing Guide for additional details.